NOAA SWPC Alerts, Watches and Warnings
The National Oceanic and Atmospheric Administration Space Weather Prediction Center (NOAA SWPC) is the official space weather government agency from the United States that provides alerts, watches and warning for space weather disturbances. Below you will find the latest space weather alerts, watches and warnings issued by the NOAA SWPC.
Sunday, 25 January 2026
17:54 UTC
Space Weather Message Code: WARK04
Serial Number: 5239
Issue Time: 2026 Jan 25 1754 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5238
Valid From: 2026 Jan 25 0245 UTC
Now Valid Until: 2026 Jan 26 0300 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
11:50 UTC
Space Weather Message Code: WARK04
Serial Number: 5238
Issue Time: 2026 Jan 25 1150 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5237
Valid From: 2026 Jan 25 0245 UTC
Now Valid Until: 2026 Jan 25 1800 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
05:00 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3610
Issue Time: 2026 Jan 25 0500 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3609
Begin Time: 2026 Jan 21 0950 UTC
Yesterday Maximum 2MeV Flux: 5171 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
02:48 UTC
Space Weather Message Code: WARK04
Serial Number: 5237
Issue Time: 2026 Jan 25 0248 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Jan 25 0245 UTC
Valid To: 2026 Jan 25 1200 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
Saturday, 24 January 2026
17:52 UTC
Space Weather Message Code: WARK04
Serial Number: 5236
Issue Time: 2026 Jan 24 1752 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5235
Valid From: 2026 Jan 22 2224 UTC
Now Valid Until: 2026 Jan 24 2359 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
05:00 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3609
Issue Time: 2026 Jan 24 0500 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3608
Begin Time: 2026 Jan 21 0950 UTC
Yesterday Maximum 2MeV Flux: 3392 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
02:57 UTC
Space Weather Message Code: WARK05
Serial Number: 2183
Issue Time: 2026 Jan 24 0257 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2182
Valid From: 2026 Jan 22 2325 UTC
Now Valid Until: 2026 Jan 24 1500 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
02:56 UTC
Space Weather Message Code: WARK04
Serial Number: 5235
Issue Time: 2026 Jan 24 0256 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5234
Valid From: 2026 Jan 22 2224 UTC
Now Valid Until: 2026 Jan 24 1800 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
Friday, 23 January 2026
20:56 UTC
Space Weather Message Code: WARK04
Serial Number: 5234
Issue Time: 2026 Jan 23 2056 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5233
Valid From: 2026 Jan 22 2224 UTC
Now Valid Until: 2026 Jan 24 0300 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
20:56 UTC
Space Weather Message Code: WARK05
Serial Number: 2182
Issue Time: 2026 Jan 23 2056 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2181
Valid From: 2026 Jan 22 2325 UTC
Now Valid Until: 2026 Jan 24 0300 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
14:56 UTC
Space Weather Message Code: WARK04
Serial Number: 5233
Issue Time: 2026 Jan 23 1456 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5232
Valid From: 2026 Jan 22 2224 UTC
Now Valid Until: 2026 Jan 23 2359 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
14:56 UTC
Space Weather Message Code: WARK05
Serial Number: 2181
Issue Time: 2026 Jan 23 1456 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2180
Valid From: 2026 Jan 22 2325 UTC
Now Valid Until: 2026 Jan 23 2100 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
09:03 UTC
Space Weather Message Code: WARK04
Serial Number: 5232
Issue Time: 2026 Jan 23 0903 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5231
Valid From: 2026 Jan 22 2224 UTC
Now Valid Until: 2026 Jan 23 1800 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
08:54 UTC
Space Weather Message Code: WARK05
Serial Number: 2180
Issue Time: 2026 Jan 23 0854 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2179
Valid From: 2026 Jan 22 2325 UTC
Now Valid Until: 2026 Jan 23 1500 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
04:59 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3608
Issue Time: 2026 Jan 23 0459 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3607
Begin Time: 2026 Jan 21 0950 UTC
Yesterday Maximum 2MeV Flux: 5365 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
00:00 UTC
Space Weather Message Code: WARK04
Serial Number: 5231
Issue Time: 2026 Jan 23 0000 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5230
Valid From: 2026 Jan 22 2224 UTC
Now Valid Until: 2026 Jan 23 1500 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
Thursday, 22 January 2026
23:39 UTC
Space Weather Message Code: WARK06
Serial Number: 638
Issue Time: 2026 Jan 22 2339 UTC
WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2026 Jan 22 2339 UTC
Valid To: 2026 Jan 23 0900 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
23:29 UTC
Space Weather Message Code: ALTK05
Serial Number: 1961
Issue Time: 2026 Jan 22 2329 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Jan 22 2327 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
23:25 UTC
Space Weather Message Code: WARK05
Serial Number: 2179
Issue Time: 2026 Jan 22 2325 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 Jan 22 2325 UTC
Valid To: 2026 Jan 23 0900 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
23:00 UTC
Space Weather Message Code: ALTK04
Serial Number: 2625
Issue Time: 2026 Jan 22 2300 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Jan 22 2254 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
22:24 UTC
Space Weather Message Code: WARK04
Serial Number: 5230
Issue Time: 2026 Jan 22 2224 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Jan 22 2224 UTC
Valid To: 2026 Jan 23 0900 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
17:54 UTC
Space Weather Message Code: SUMPX1
Serial Number: 127
Issue Time: 2026 Jan 22 1754 UTC
SUMMARY: Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2026 Jan 18 2255 UTC
Maximum Time: 2026 Jan 19 1915 UTC
End Time: 2026 Jan 22 0545 UTC
Maximum 10MeV Flux: 37000 pfu
NOAA Scale: S4 - Severe
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
11:03 UTC
Space Weather Message Code: WARPX1
Serial Number: 623
Issue Time: 2026 Jan 22 1103 UTC
EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 622
Valid From: 2026 Jan 22 0124 UTC
Now Valid Until: 2026 Jan 22 1800 UTC
Warning Condition: Onset
Predicted NOAA Scale: S1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.
05:37 UTC
Space Weather Message Code: ALTPX1
Serial Number: 363
Issue Time: 2026 Jan 22 0537 UTC
ALERT: Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2026 Jan 22 0520 UTC
NOAA Scale: S1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.
04:59 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3607
Issue Time: 2026 Jan 22 0459 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3606
Begin Time: 2026 Jan 21 0950 UTC
Yesterday Maximum 2MeV Flux: 3332 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
01:24 UTC
Space Weather Message Code: WARPX1
Serial Number: 622
Issue Time: 2026 Jan 22 0124 UTC
WARNING: Proton 10MeV Integral Flux above 10pfu expected
Valid From: 2026 Jan 22 0124 UTC
Valid To: 2026 Jan 22 1200 UTC
Warning Condition: Onset
Predicted NOAA Scale: S1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.
Wednesday, 21 January 2026
10:56 UTC
Space Weather Message Code: WARK04
Serial Number: 5229
Issue Time: 2026 Jan 21 1056 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5228
Valid From: 2026 Jan 16 0254 UTC
Now Valid Until: 2026 Jan 22 1800 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
10:56 UTC
Space Weather Message Code: WARK05
Serial Number: 2178
Issue Time: 2026 Jan 21 1056 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2177
Valid From: 2026 Jan 19 1902 UTC
Now Valid Until: 2026 Jan 22 1500 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
10:56 UTC
Space Weather Message Code: WARK06
Serial Number: 637
Issue Time: 2026 Jan 21 1056 UTC
EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 636
Valid From: 2026 Jan 19 1902 UTC
Now Valid Until: 2026 Jan 21 2359 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
10:56 UTC
Space Weather Message Code: WARK07
Serial Number: 144
Issue Time: 2026 Jan 21 1056 UTC
EXTENDED WARNING: Geomagnetic K-index of 7 or greater expected
Extension to Serial Number: 143
Valid From: 2026 Jan 19 1902 UTC
Now Valid Until: 2026 Jan 21 1800 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
10:37 UTC
Space Weather Message Code: ALTK06
Serial Number: 695
Issue Time: 2026 Jan 21 1037 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Jan 21 1037 UTC
Synoptic Period: 0900-1200 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
10:06 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3606
Issue Time: 2026 Jan 21 1006 UTC
ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2026 Jan 21 0950 UTC
Station: GOES19
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
09:48 UTC
Space Weather Message Code: ALTK05
Serial Number: 1960
Issue Time: 2026 Jan 21 0948 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Jan 21 0948 UTC
Synoptic Period: 0900-1200 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
08:53 UTC
Space Weather Message Code: ALTK07
Serial Number: 211
Issue Time: 2026 Jan 21 0853 UTC
ALERT: Geomagnetic K-index of 7
Threshold Reached: 2026 Jan 21 0852 UTC
Synoptic Period: 0600-0900 UTC
Active Warning: Yes
NOAA Scale: G3 - Strong
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
07:31 UTC
Space Weather Message Code: WATA20
Serial Number: 1090
Issue Time: 2026 Jan 21 0731 UTC
WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day:
Jan 22: G1 (Minor) Jan 23: None (Below G1) Jan 24: None (Below G1)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
07:27 UTC
Space Weather Message Code: ALTK06
Serial Number: 694
Issue Time: 2026 Jan 21 0727 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Jan 21 0723 UTC
Synoptic Period: 0600-0900 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
07:10 UTC
Space Weather Message Code: ALTK05
Serial Number: 1959
Issue Time: 2026 Jan 21 0710 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Jan 21 0704 UTC
Synoptic Period: 0600-0900 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
05:11 UTC
Space Weather Message Code: ALTK07
Serial Number: 210
Issue Time: 2026 Jan 21 0511 UTC
ALERT: Geomagnetic K-index of 7
Threshold Reached: 2026 Jan 21 0507 UTC
Synoptic Period: 0300-0600 UTC
Active Warning: Yes
NOAA Scale: G3 - Strong
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
04:47 UTC
Space Weather Message Code: ALTK06
Serial Number: 693
Issue Time: 2026 Jan 21 0447 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Jan 21 0439 UTC
Synoptic Period: 0300-0600 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
03:54 UTC
Space Weather Message Code: ALTK05
Serial Number: 1958
Issue Time: 2026 Jan 21 0354 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Jan 21 0349 UTC
Synoptic Period: 0300-0600 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
02:20 UTC
Space Weather Message Code: ALTK07
Serial Number: 209
Issue Time: 2026 Jan 21 0220 UTC
ALERT: Geomagnetic K-index of 7
Threshold Reached: 2026 Jan 21 0213 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Scale: G3 - Strong
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
02:01 UTC
Space Weather Message Code: WARK04
Serial Number: 5228
Issue Time: 2026 Jan 21 0201 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5227
Valid From: 2026 Jan 16 0254 UTC
Now Valid Until: 2026 Jan 21 2100 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
02:01 UTC
Space Weather Message Code: WARK05
Serial Number: 2177
Issue Time: 2026 Jan 21 0201 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2176
Valid From: 2026 Jan 19 1902 UTC
Now Valid Until: 2026 Jan 21 1800 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
02:01 UTC
Space Weather Message Code: WARK07
Serial Number: 143
Issue Time: 2026 Jan 21 0201 UTC
EXTENDED WARNING: Geomagnetic K-index of 7 or greater expected
Extension to Serial Number: 142
Valid From: 2026 Jan 19 1902 UTC
Now Valid Until: 2026 Jan 21 1200 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
02:01 UTC
Space Weather Message Code: WARK06
Serial Number: 636
Issue Time: 2026 Jan 21 0201 UTC
EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 635
Valid From: 2026 Jan 19 1902 UTC
Now Valid Until: 2026 Jan 21 1500 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
01:55 UTC
Space Weather Message Code: SUMPX2
Serial Number: 59
Issue Time: 2026 Jan 21 0155 UTC
SUMMARY: Proton Event 10MeV Integral Flux exceeded 100pfu
Begin Time: 2026 Jan 19 0440 UTC
Maximum Time: 2026 Jan 19 1915 UTC
End Time: 2026 Jan 20 1335 UTC
Maximum 10MeV Flux: 37000 pfu
NOAA Scale: S4 - Severe
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
00:35 UTC
Space Weather Message Code: ALTK06
Serial Number: 692
Issue Time: 2026 Jan 21 0035 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Jan 21 0032 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
00:28 UTC
Space Weather Message Code: ALTK05
Serial Number: 1957
Issue Time: 2026 Jan 21 0028 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Jan 21 0013 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
00:08 UTC
Space Weather Message Code: ALTK08
Serial Number: 59
Issue Time: 2026 Jan 21 0008 UTC
ALERT: Geomagnetic K-index of 8, 9-
Threshold Reached: 2026 Jan 20 2359 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
NOAA Scale: G4 - Severe
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 45 degrees Geomagnetic Latitude.
Induced Currents - Possible widespread voltage control problems and some protective systems may mistakenly trip out key assets from the power grid. Induced pipeline currents intensify.
Spacecraft - Systems may experience surface charging; increased drag on low earth orbit satellites, and tracking and orientation problems may occur.
Navigation - Satellite navigation (GPS) degraded or inoperable for hours.
Radio - HF (high frequency) radio propagation sporadic or blacked out.
Aurora - Aurora may be seen as low as Alabama and northern California.
Tuesday, 20 January 2026
23:55 UTC
Space Weather Message Code: WARPX1
Serial Number: 621
Issue Time: 2026 Jan 20 2355 UTC
EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 620
Valid From: 2026 Jan 18 2130 UTC
Now Valid Until: 2026 Jan 21 2359 UTC
Warning Condition: Persistence
Predicted NOAA Scale: S1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.
22:42 UTC
Space Weather Message Code: ALTK07
Serial Number: 208
Issue Time: 2026 Jan 20 2242 UTC
ALERT: Geomagnetic K-index of 7
Threshold Reached: 2026 Jan 20 2243 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
NOAA Scale: G3 - Strong
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
22:33 UTC
Space Weather Message Code: ALTK06
Serial Number: 691
Issue Time: 2026 Jan 20 2233 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Jan 20 2230 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
21:35 UTC
Space Weather Message Code: ALTK05
Serial Number: 1956
Issue Time: 2026 Jan 20 2135 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Jan 20 2134 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
19:53 UTC
Space Weather Message Code: WARK06
Serial Number: 635
Issue Time: 2026 Jan 20 1953 UTC
EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 634
Valid From: 2026 Jan 19 1902 UTC
Now Valid Until: 2026 Jan 21 0600 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
19:53 UTC
Space Weather Message Code: WARK07
Serial Number: 142
Issue Time: 2026 Jan 20 1953 UTC
EXTENDED WARNING: Geomagnetic K-index of 7 or greater expected
Extension to Serial Number: 141
Valid From: 2026 Jan 19 1902 UTC
Now Valid Until: 2026 Jan 21 0300 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
19:53 UTC
Space Weather Message Code: WARK04
Serial Number: 5227
Issue Time: 2026 Jan 20 1953 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5226
Valid From: 2026 Jan 16 0254 UTC
Now Valid Until: 2026 Jan 21 1500 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
19:53 UTC
Space Weather Message Code: WARK05
Serial Number: 2176
Issue Time: 2026 Jan 20 1953 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2175
Valid From: 2026 Jan 19 1902 UTC
Now Valid Until: 2026 Jan 21 0900 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
19:49 UTC
Space Weather Message Code: ALTK07
Serial Number: 207
Issue Time: 2026 Jan 20 1949 UTC
ALERT: Geomagnetic K-index of 7
Threshold Reached: 2026 Jan 20 1945 UTC
Synoptic Period: 1800-2100 UTC
Active Warning: Yes
NOAA Scale: G3 - Strong
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
18:56 UTC
Space Weather Message Code: ALTK06
Serial Number: 690
Issue Time: 2026 Jan 20 1856 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Jan 20 1852 UTC
Synoptic Period: 1800-2100 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
18:23 UTC
Space Weather Message Code: ALTK05
Serial Number: 1955
Issue Time: 2026 Jan 20 1823 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Jan 20 1818 UTC
Synoptic Period: 1800-2100 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
17:27 UTC
Space Weather Message Code: ALTK07
Serial Number: 206
Issue Time: 2026 Jan 20 1727 UTC
ALERT: Geomagnetic K-index of 7
Threshold Reached: 2026 Jan 20 1724 UTC
Synoptic Period: 1500-1800 UTC
Active Warning: Yes
NOAA Scale: G3 - Strong
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
15:30 UTC
Space Weather Message Code: ALTK06
Serial Number: 689
Issue Time: 2026 Jan 20 1530 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Jan 20 1523 UTC
Synoptic Period: 1500-1800 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
15:19 UTC
Space Weather Message Code: ALTK05
Serial Number: 1954
Issue Time: 2026 Jan 20 1519 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Jan 20 1513 UTC
Synoptic Period: 1500-1800 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
14:56 UTC
Space Weather Message Code: WARK07
Serial Number: 141
Issue Time: 2026 Jan 20 1456 UTC
EXTENDED WARNING: Geomagnetic K-index of 7 or greater expected
Extension to Serial Number: 140
Valid From: 2026 Jan 19 1902 UTC
Now Valid Until: 2026 Jan 20 2100 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
14:56 UTC
Space Weather Message Code: WARK06
Serial Number: 634
Issue Time: 2026 Jan 20 1456 UTC
EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 633
Valid From: 2026 Jan 19 1902 UTC
Now Valid Until: 2026 Jan 20 2359 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
12:48 UTC
Space Weather Message Code: ALTK07
Serial Number: 205
Issue Time: 2026 Jan 20 1248 UTC
ALERT: Geomagnetic K-index of 7
Threshold Reached: 2026 Jan 20 1247 UTC
Synoptic Period: 1200-1500 UTC
Active Warning: Yes
NOAA Scale: G3 - Strong
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
12:29 UTC
Space Weather Message Code: ALTK06
Serial Number: 688
Issue Time: 2026 Jan 20 1229 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Jan 20 1229 UTC
Synoptic Period: 1200-1500 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
12:11 UTC
Space Weather Message Code: ALTK05
Serial Number: 1953
Issue Time: 2026 Jan 20 1211 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Jan 20 1210 UTC
Synoptic Period: 1200-1500 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
10:22 UTC
Space Weather Message Code: ALTK08
Serial Number: 58
Issue Time: 2026 Jan 20 1022 UTC
ALERT: Geomagnetic K-index of 8, 9-
Threshold Reached: 2026 Jan 20 1021 UTC
Synoptic Period: 0900-1200 UTC
Active Warning: Yes
NOAA Scale: G4 - Severe
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 45 degrees Geomagnetic Latitude.
Induced Currents - Possible widespread voltage control problems and some protective systems may mistakenly trip out key assets from the power grid. Induced pipeline currents intensify.
Spacecraft - Systems may experience surface charging; increased drag on low earth orbit satellites, and tracking and orientation problems may occur.
Navigation - Satellite navigation (GPS) degraded or inoperable for hours.
Radio - HF (high frequency) radio propagation sporadic or blacked out.
Aurora - Aurora may be seen as low as Alabama and northern California.
09:43 UTC
Space Weather Message Code: ALTK07
Serial Number: 204
Issue Time: 2026 Jan 20 0943 UTC
ALERT: Geomagnetic K-index of 7
Threshold Reached: 2026 Jan 20 0943 UTC
Synoptic Period: 0900-1200 UTC
Active Warning: Yes
NOAA Scale: G3 - Strong
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
09:28 UTC
Space Weather Message Code: ALTK06
Serial Number: 687
Issue Time: 2026 Jan 20 0928 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Jan 20 0927 UTC
Synoptic Period: 0900-1200 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
09:17 UTC
Space Weather Message Code: ALTK05
Serial Number: 1952
Issue Time: 2026 Jan 20 0917 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Jan 20 0917 UTC
Synoptic Period: 0900-1200 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
08:23 UTC
Space Weather Message Code: ALTK08
Serial Number: 57
Issue Time: 2026 Jan 20 0823 UTC
ALERT: Geomagnetic K-index of 8, 9-
Threshold Reached: 2026 Jan 20 0823 UTC
Synoptic Period: 0600-0900 UTC
Active Warning: Yes
NOAA Scale: G4 - Severe
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 45 degrees Geomagnetic Latitude.
Induced Currents - Possible widespread voltage control problems and some protective systems may mistakenly trip out key assets from the power grid. Induced pipeline currents intensify.
Spacecraft - Systems may experience surface charging; increased drag on low earth orbit satellites, and tracking and orientation problems may occur.
Navigation - Satellite navigation (GPS) degraded or inoperable for hours.
Radio - HF (high frequency) radio propagation sporadic or blacked out.
Aurora - Aurora may be seen as low as Alabama and northern California.
08:00 UTC
Space Weather Message Code: ALTK07
Serial Number: 203
Issue Time: 2026 Jan 20 0800 UTC
ALERT: Geomagnetic K-index of 7
Threshold Reached: 2026 Jan 20 0752 UTC
Synoptic Period: 0600-0900 UTC
Active Warning: Yes
NOAA Scale: G3 - Strong
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
07:36 UTC
Space Weather Message Code: ALTK06
Serial Number: 686
Issue Time: 2026 Jan 20 0736 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Jan 20 0730 UTC
Synoptic Period: 0600-0900 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
07:05 UTC
Space Weather Message Code: ALTK05
Serial Number: 1951
Issue Time: 2026 Jan 20 0705 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Jan 20 0658 UTC
Synoptic Period: 0600-0900 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
06:03 UTC
Space Weather Message Code: ALTK06
Serial Number: 685
Issue Time: 2026 Jan 20 0603 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Jan 20 0559 UTC
Synoptic Period: 0300-0600 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
04:09 UTC
Space Weather Message Code: ALTK05
Serial Number: 1949
Issue Time: 2026 Jan 20 0409 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Jan 20 0403 UTC
Synoptic Period: 0300-0600 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
04:06 UTC
Space Weather Message Code: ALTK05
Serial Number: 1949
Issue Time: 2026 Jan 20 0406 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Jan 20 0403 UTC
Synoptic Period: 0300-0600 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
01:03 UTC
Space Weather Message Code: SUMPX3
Serial Number: 22
Issue Time: 2026 Jan 20 0103 UTC
SUMMARY: Proton Event 10MeV Integral Flux exceeded 1000pfu
Begin Time: 2026 Jan 19 1020 UTC
Maximum Time: 2026 Jan 19 1915 UTC
End Time: 2026 Jan 19 2135 UTC
Maximum 10MeV Flux: 37000 pfu
NOAA Scale: S4 - Severe
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
00:14 UTC
Space Weather Message Code: ALTK06
Serial Number: 684
Issue Time: 2026 Jan 20 0014 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Jan 20 0016 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
00:12 UTC
Space Weather Message Code: ALTK05
Serial Number: 1948
Issue Time: 2026 Jan 20 0012 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Jan 20 0008 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
Monday, 19 January 2026
23:21 UTC
Space Weather Message Code: SUMPX4
Serial Number: 2
Issue Time: 2026 Jan 19 2321 UTC
SUMMARY: Proton Event 10MeV Integral Flux exceeded 10000pfu
Begin Time: 2026 Jan 19 1810 UTC
Maximum Time: 2026 Jan 19 1915 UTC
End Time: 2026 Jan 19 2045 UTC
Maximum 10MeV Flux: 37000 pfu
NOAA Scale: S4 - Severe
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
21:56 UTC
Space Weather Message Code: SUMSUD
Serial Number: 294
Issue Time: 2026 Jan 19 2156 UTC
SUMMARY: Geomagnetic Sudden Impulse
Observed: 2026 Jan 19 2134 UTC
Deviation: 481 nT
Station: WNG
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
21:17 UTC
Space Weather Message Code: ALTK08
Serial Number: 56
Issue Time: 2026 Jan 19 2117 UTC
ALERT: Geomagnetic K-index of 8, 9-
Threshold Reached: 2026 Jan 19 2119 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
NOAA Scale: G4 - Severe
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 45 degrees Geomagnetic Latitude.
Induced Currents - Possible widespread voltage control problems and some protective systems may mistakenly trip out key assets from the power grid. Induced pipeline currents intensify.
Spacecraft - Systems may experience surface charging; increased drag on low earth orbit satellites, and tracking and orientation problems may occur.
Navigation - Satellite navigation (GPS) degraded or inoperable for hours.
Radio - HF (high frequency) radio propagation sporadic or blacked out.
Aurora - Aurora may be seen as low as Alabama and northern California.
21:14 UTC
Space Weather Message Code: ALTK07
Serial Number: 202
Issue Time: 2026 Jan 19 2114 UTC
ALERT: Geomagnetic K-index of 7
Threshold Reached: 2026 Jan 19 2114 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
NOAA Scale: G3 - Strong
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
21:09 UTC
Space Weather Message Code: ALTK06
Serial Number: 683
Issue Time: 2026 Jan 19 2109 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Jan 19 2110 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
21:09 UTC
Space Weather Message Code: ALTK05
Serial Number: 1947
Issue Time: 2026 Jan 19 2109 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Jan 19 2109 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
19:43 UTC
Space Weather Message Code: ALTK08
Serial Number: 55
Issue Time: 2026 Jan 19 1943 UTC
ALERT: Geomagnetic K-index of 8, 9-
Threshold Reached: 2026 Jan 19 1938 UTC
Synoptic Period: 1800-2100 UTC
Active Warning: Yes
NOAA Scale: G4 - Severe
Comment: Currently at a Kp8-
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 45 degrees Geomagnetic Latitude.
Induced Currents - Possible widespread voltage control problems and some protective systems may mistakenly trip out key assets from the power grid. Induced pipeline currents intensify.
Spacecraft - Systems may experience surface charging; increased drag on low earth orbit satellites, and tracking and orientation problems may occur.
Navigation - Satellite navigation (GPS) degraded or inoperable for hours.
Radio - HF (high frequency) radio propagation sporadic or blacked out.
Aurora - Aurora may be seen as low as Alabama and northern California.
19:36 UTC
Space Weather Message Code: SUMSUD
Serial Number: 293
Issue Time: 2026 Jan 19 1936 UTC
SUMMARY: Geomagnetic Sudden Impulse
Observed: 2026 Jan 19 1920 UTC
Deviation: 97 nT
Station: BOU
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
19:30 UTC
Space Weather Message Code: ALTK07
Serial Number: 201
Issue Time: 2026 Jan 19 1930 UTC
ALERT: Geomagnetic K-index of 7
Threshold Reached: 2026 Jan 19 1931 UTC
Synoptic Period: 1800-2100 UTC
Active Warning: Yes
NOAA Scale: G3 - Strong
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
19:28 UTC
Space Weather Message Code: WARK04
Serial Number: 5226
Issue Time: 2026 Jan 19 1928 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5225
Valid From: 2026 Jan 16 0254 UTC
Now Valid Until: 2026 Jan 21 0300 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
19:27 UTC
Space Weather Message Code: WARK05
Serial Number: 2175
Issue Time: 2026 Jan 19 1927 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2174
Valid From: 2026 Jan 19 1902 UTC
Now Valid Until: 2026 Jan 20 2359 UTC
Warning Condition: Persistence
Comment: Correction for end time.
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
19:24 UTC
Space Weather Message Code: ALTK06
Serial Number: 682
Issue Time: 2026 Jan 19 1924 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Jan 19 1923 UTC
Synoptic Period: 1800-2100 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
19:22 UTC
Space Weather Message Code: ALTK05
Serial Number: 1946
Issue Time: 2026 Jan 19 1922 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Jan 19 1922 UTC
Synoptic Period: 1800-2100 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
19:09 UTC
Space Weather Message Code: WARSUD
Serial Number: 249
Issue Time: 2026 Jan 19 1909 UTC
WARNING: Geomagnetic Sudden Impulse expected
Valid From: 2026 Jan 19 1920 UTC
Valid To: 2026 Jan 19 2000 UTC
IP Shock Passage Observed: 2026 Jan 19 1903 UTC
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
19:06 UTC
Space Weather Message Code: WARK06
Serial Number: 633
Issue Time: 2026 Jan 19 1906 UTC
WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2026 Jan 19 1902 UTC
Valid To: 2026 Jan 20 1800 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
19:06 UTC
Space Weather Message Code: WARK05
Serial Number: 2174
Issue Time: 2026 Jan 19 1906 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 Jan 19 1902 UTC
Valid To: 2026 Jan 20 0900 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
19:06 UTC
Space Weather Message Code: WARK07
Serial Number: 140
Issue Time: 2026 Jan 19 1906 UTC
WARNING: Geomagnetic K-index of 7 or greater expected
Valid From: 2026 Jan 19 1902 UTC
Valid To: 2026 Jan 20 1500 UTC
Warning Condition: Onset
NOAA Scale: G3 or greater
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
18:19 UTC
Space Weather Message Code: ALTPX4
Serial Number: 2
Issue Time: 2026 Jan 19 1819 UTC
ALERT: Proton Event 10MeV Integral Flux exceeded 10000pfu
Begin Time: 2026 Jan 19 1810 UTC
NOAA Scale: S4 - Severe
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Radiation - Passengers and crew in high latitude, high altitude flights may experience significant radiation exposures. Astronauts on EVA (extra-vehicular activity) are exposed to unavoidable radiation hazard.
Spacecraft - Satellites may experience memory device problems and noise on imaging systems; star-trackers may cause orientation problems; solar panel efficiency may be degraded.
Radio - Widespread blackout of polar HF (high frequency) communications likely.
18:14 UTC
Space Weather Message Code: WARPX1
Serial Number: 620
Issue Time: 2026 Jan 19 1814 UTC
EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 619
Valid From: 2026 Jan 18 2130 UTC
Now Valid Until: 2026 Jan 20 2359 UTC
Warning Condition: Persistence
Predicted NOAA Scale: S1 - Minor
Comment: This warning UPGRADED from S3 (Strong) to S4 (Severe) due to increasing Proton flux levels.
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.
12:03 UTC
Space Weather Message Code: WATA99
Serial Number: 13
Issue Time: 2026 Jan 19 1203 UTC
WATCH: Geomagnetic Storm Category G4 or Greater Predicted
Highest Storm Level Predicted by Day:
Jan 20: G4 (Severe) Jan 21: G1 (Minor) Jan 22: None (Below G1)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 45 degrees Geomagnetic Latitude.
Induced Currents - Possible widespread voltage control problems and some protective systems may mistakenly trip out key assets from the power grid. Induced pipeline currents intensify.
Spacecraft - Systems may experience surface charging; increased drag on low earth orbit satellites, and tracking and orientation problems may occur.
Navigation - Satellite navigation (GPS) degraded or inoperable for hours.
Radio - HF (high frequency) radio propagation sporadic or blacked out.
Aurora - Aurora may be seen as low as Alabama and northern California.
10:29 UTC
Space Weather Message Code: ALTPX3
Serial Number: 34
Issue Time: 2026 Jan 19 1029 UTC
ALERT: Proton Event 10MeV Integral Flux exceeded 1000pfu
Begin Time: 2026 Jan 19 1020 UTC
NOAA Scale: S3 - Strong
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Radiation - Passengers and crew in high latitude, high altitude flights may experience increasing radiation exposures. Astronauts on EVA (extra-vehicular activity) are exposed to elevated radiation levels.
Spacecraft - Single-event upsets to satellite operations, noise in imaging systems, and slight reduction of efficiency in solar panels are likely.
Radio - Degraded or episodically blacked-out polar HF (high frequency) radio propagation.
10:29 UTC
Space Weather Message Code: WARPX1
Serial Number: 619
Issue Time: 2026 Jan 19 1029 UTC
EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 618
Valid From: 2026 Jan 18 2130 UTC
Now Valid Until: 2026 Jan 20 2359 UTC
Warning Condition: Persistence
Predicted NOAA Scale: S3 - Strong
Comment: This warning UPGRADED from S2 (Moderate) to S3 (Strong) due to increasing Proton flux levels.
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.
05:00 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3605
Issue Time: 2026 Jan 19 0500 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3604
Begin Time: 2026 Jan 12 1040 UTC
Yesterday Maximum 2MeV Flux: 4619 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
04:47 UTC
Space Weather Message Code: ALTPX2
Serial Number: 80
Issue Time: 2026 Jan 19 0447 UTC
ALERT: Proton Event 10MeV Integral Flux exceeded 100pfu
Begin Time: 2026 Jan 19 0440 UTC
NOAA Scale: S2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Radiation - Passengers and crew in high latitude, high altitude flights may experience small, increased radiation exposures.
Spacecraft - Infrequent single-event upsets to satellites are possible.
Radio - Small effects on polar HF (high frequency) propagation resulting in fades at lower frequencies.
04:11 UTC
Space Weather Message Code: WARPX1
Serial Number: 618
Issue Time: 2026 Jan 19 0411 UTC
EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 617
Valid From: 2026 Jan 18 2130 UTC
Now Valid Until: 2026 Jan 19 2359 UTC
Warning Condition: Persistence
Predicted NOAA Scale: S2 - Moderate
Comment: This warning UPGRADED from S1 (Minor) to S2 (Moderate) due to increasing Proton flux levels.
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.
Sunday, 18 January 2026
23:54 UTC
Space Weather Message Code: WARK04
Serial Number: 5225
Issue Time: 2026 Jan 18 2354 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5224
Valid From: 2026 Jan 16 0254 UTC
Now Valid Until: 2026 Jan 19 2359 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
23:11 UTC
Space Weather Message Code: ALTPX1
Serial Number: 362
Issue Time: 2026 Jan 18 2311 UTC
ALERT: Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2026 Jan 18 2255 UTC
NOAA Scale: S1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.
21:30 UTC
Space Weather Message Code: WARPX1
Serial Number: 617
Issue Time: 2026 Jan 18 2130 UTC
WARNING: Proton 10MeV Integral Flux above 10pfu expected
Valid From: 2026 Jan 18 2130 UTC
Valid To: 2026 Jan 19 1200 UTC
Warning Condition: Onset
Predicted NOAA Scale: S1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.
19:55 UTC
Space Weather Message Code: SUM10R
Serial Number: 899
Issue Time: 2026 Jan 18 1955 UTC
SUMMARY: 10cm Radio Burst
Begin Time: 2026 Jan 18 1739 UTC
Maximum Time: 2026 Jan 18 1757 UTC
End Time: 2026 Jan 18 1944 UTC
Duration: 122 minutes
Peak Flux: 3200 sfu
Latest Penticton Noon Flux: 148 sfu
Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.
19:00 UTC
Space Weather Message Code: SUMX01
Serial Number: 205
Issue Time: 2026 Jan 18 1900 UTC
SUMMARY: X-ray Event exceeded X1
Begin Time: 2026 Jan 18 1727 UTC
Maximum Time: 2026 Jan 18 1809 UTC
End Time: 2026 Jan 18 1851 UTC
X-ray Class: X1.9
Optical Class: 3b
Location: S12E20
NOAA Scale: R3 - Strong
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact consists of large portions of the sunlit side of Earth, strongest at the sub-solar point.
Radio - Wide area blackout of HF (high frequency) radio communication for about an hour.
18:47 UTC
Space Weather Message Code: ALTTP2
Serial Number: 1466
Issue Time: 2026 Jan 18 1847 UTC
ALERT: Type II Radio Emission
Begin Time: 2026 Jan 18 1759 UTC
Estimated Velocity: 693 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.
18:13 UTC
Space Weather Message Code: ALTTP4
Serial Number: 704
Issue Time: 2026 Jan 18 1813 UTC
ALERT: Type IV Radio Emission
Begin Time: 2026 Jan 18 1748 UTC
Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.
17:52 UTC
Space Weather Message Code: ALTXMF
Serial Number: 508
Issue Time: 2026 Jan 18 1752 UTC
ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2026 Jan 18 1752 UTC
NOAA Scale: R2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.
06:02 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3604
Issue Time: 2026 Jan 18 0602 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3603
Begin Time: 2026 Jan 12 1040 UTC
Yesterday Maximum 2MeV Flux: 2763 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Saturday, 17 January 2026
22:36 UTC
Space Weather Message Code: WARK04
Serial Number: 5224
Issue Time: 2026 Jan 17 2236 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5223
Valid From: 2026 Jan 16 0254 UTC
Now Valid Until: 2026 Jan 18 2359 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
13:43 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3603
Issue Time: 2026 Jan 17 1343 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3602
Begin Time: 2026 Jan 12 1040 UTC
Yesterday Maximum 2MeV Flux: 8698 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
02:09 UTC
Space Weather Message Code: ALTK05
Serial Number: 1945
Issue Time: 2026 Jan 17 0209 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Jan 17 0209 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
02:07 UTC
Space Weather Message Code: WARK05
Serial Number: 2173
Issue Time: 2026 Jan 17 0207 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2172
Valid From: 2026 Jan 16 1525 UTC
Now Valid Until: 2026 Jan 17 1800 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
02:07 UTC
Space Weather Message Code: WARK04
Serial Number: 5223
Issue Time: 2026 Jan 17 0207 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5222
Valid From: 2026 Jan 16 0254 UTC
Now Valid Until: 2026 Jan 17 2359 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
Friday, 16 January 2026
22:57 UTC
Space Weather Message Code: ALTK05
Serial Number: 1944
Issue Time: 2026 Jan 16 2257 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Jan 16 2255 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
20:41 UTC
Space Weather Message Code: WARK04
Serial Number: 5222
Issue Time: 2026 Jan 16 2041 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5221
Valid From: 2026 Jan 16 0254 UTC
Now Valid Until: 2026 Jan 17 0600 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
20:41 UTC
Space Weather Message Code: WARK05
Serial Number: 2172
Issue Time: 2026 Jan 16 2041 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2171
Valid From: 2026 Jan 16 1525 UTC
Now Valid Until: 2026 Jan 17 0300 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
16:26 UTC
Space Weather Message Code: ALTK05
Serial Number: 1943
Issue Time: 2026 Jan 16 1626 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Jan 16 1626 UTC
Synoptic Period: 1500-1800 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
15:23 UTC
Space Weather Message Code: WARK05
Serial Number: 2171
Issue Time: 2026 Jan 16 1523 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 Jan 16 1525 UTC
Valid To: 2026 Jan 16 2100 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
12:27 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3602
Issue Time: 2026 Jan 16 1227 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3601
Begin Time: 2026 Jan 12 1040 UTC
Yesterday Maximum 2MeV Flux: 9014 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
05:15 UTC
Space Weather Message Code: ALTK04
Serial Number: 2624
Issue Time: 2026 Jan 16 0515 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Jan 16 0515 UTC
Synoptic Period: 0300-0600 UTC
Active Warning: Yes
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
02:54 UTC
Space Weather Message Code: WARK04
Serial Number: 5221
Issue Time: 2026 Jan 16 0254 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Jan 16 0254 UTC
Valid To: 2026 Jan 16 2359 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
Thursday, 15 January 2026
20:55 UTC
Space Weather Message Code: WATA20
Serial Number: 1089
Issue Time: 2026 Jan 15 2055 UTC
WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day:
Jan 16: None (Below G1) Jan 17: G1 (Minor) Jan 18: G1 (Minor)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
04:59 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3601
Issue Time: 2026 Jan 15 0459 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3600
Begin Time: 2026 Jan 12 1040 UTC
Yesterday Maximum 2MeV Flux: 9399 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Wednesday, 14 January 2026
23:14 UTC
Space Weather Message Code: WATA20
Serial Number: 1088
Issue Time: 2026 Jan 14 2314 UTC
WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day:
Jan 15: None (Below G1) Jan 16: None (Below G1) Jan 17: G1 (Minor)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
04:59 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3600
Issue Time: 2026 Jan 14 0459 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3599
Begin Time: 2026 Jan 12 1040 UTC
Yesterday Maximum 2MeV Flux: 3575 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Tuesday, 13 January 2026
05:55 UTC
Space Weather Message Code: WARK04
Serial Number: 5220
Issue Time: 2026 Jan 13 0555 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5219
Valid From: 2026 Jan 12 2245 UTC
Now Valid Until: 2026 Jan 13 1200 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
04:59 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3599
Issue Time: 2026 Jan 13 0459 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3598
Begin Time: 2026 Jan 12 1040 UTC
Yesterday Maximum 2MeV Flux: 2992 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Monday, 12 January 2026
22:56 UTC
Space Weather Message Code: WARK04
Serial Number: 5219
Issue Time: 2026 Jan 12 2256 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Jan 12 2245 UTC
Valid To: 2026 Jan 13 0600 UTC
Warning Condition: Onset
Comment: Re-issue of Warning from 12/2245 UTC for bookkeeping purposes.
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
22:45 UTC
Space Weather Message Code: WARK05
Serial Number: 2171
Issue Time: 2026 Jan 12 2245 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 Jan 12 2245 UTC
Valid To: 2026 Jan 13 0600 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
11:01 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3598
Issue Time: 2026 Jan 12 1101 UTC
ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2026 Jan 12 1040 UTC
Station: GOES-19
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
09:02 UTC
Space Weather Message Code: WARK04
Serial Number: 5218
Issue Time: 2026 Jan 12 0902 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5217
Valid From: 2026 Jan 10 0732 UTC
Now Valid Until: 2026 Jan 12 2359 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
Sunday, 11 January 2026
19:19 UTC
Space Weather Message Code: WARK05
Serial Number: 2170
Issue Time: 2026 Jan 11 1919 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2169
Valid From: 2026 Jan 11 1419 UTC
Now Valid Until: 2026 Jan 12 0600 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
19:19 UTC
Space Weather Message Code: WARK06
Serial Number: 632
Issue Time: 2026 Jan 11 1919 UTC
WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2026 Jan 11 1917 UTC
Valid To: 2026 Jan 12 0300 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
19:19 UTC
Space Weather Message Code: WARK04
Serial Number: 5217
Issue Time: 2026 Jan 11 1919 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5216
Valid From: 2026 Jan 10 0732 UTC
Now Valid Until: 2026 Jan 12 1200 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
19:09 UTC
Space Weather Message Code: ALTK05
Serial Number: 1942
Issue Time: 2026 Jan 11 1909 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Jan 11 1909 UTC
Synoptic Period: 1800-2100 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
17:28 UTC
Space Weather Message Code: ALTK05
Serial Number: 1941
Issue Time: 2026 Jan 11 1728 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Jan 11 1728 UTC
Synoptic Period: 1500-1800 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
14:39 UTC
Space Weather Message Code: ALTK05
Serial Number: 1940
Issue Time: 2026 Jan 11 1439 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Jan 11 1439 UTC
Synoptic Period: 1200-1500 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
14:19 UTC
Space Weather Message Code: WARK05
Serial Number: 2169
Issue Time: 2026 Jan 11 1419 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 Jan 11 1419 UTC
Valid To: 2026 Jan 11 2100 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
11:06 UTC
Space Weather Message Code: WARK04
Serial Number: 5216
Issue Time: 2026 Jan 11 1106 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5215
Valid From: 2026 Jan 10 0732 UTC
Now Valid Until: 2026 Jan 11 2359 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
03:03 UTC
Space Weather Message Code: ALTK05
Serial Number: 1939
Issue Time: 2026 Jan 11 0303 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Jan 11 0259 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
Saturday, 10 January 2026
23:27 UTC
Space Weather Message Code: ALTK06
Serial Number: 681
Issue Time: 2026 Jan 10 2327 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Jan 10 2322 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
21:37 UTC
Space Weather Message Code: ALTK05
Serial Number: 1938
Issue Time: 2026 Jan 10 2137 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Jan 10 2133 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
21:37 UTC
Space Weather Message Code: WARK04
Serial Number: 5215
Issue Time: 2026 Jan 10 2137 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5214
Valid From: 2026 Jan 10 0732 UTC
Now Valid Until: 2026 Jan 11 1200 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
20:53 UTC
Space Weather Message Code: ALTK06
Serial Number: 680
Issue Time: 2026 Jan 10 2053 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Jan 10 2050 UTC
Synoptic Period: 1800-2100 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
20:44 UTC
Space Weather Message Code: WARK06
Serial Number: 631
Issue Time: 2026 Jan 10 2044 UTC
WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2026 Jan 10 2043 UTC
Valid To: 2026 Jan 11 0600 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
20:44 UTC
Space Weather Message Code: WARK05
Serial Number: 2168
Issue Time: 2026 Jan 10 2044 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2167
Valid From: 2026 Jan 10 1455 UTC
Now Valid Until: 2026 Jan 11 0900 UTC
Warning Condition: persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
20:35 UTC
Space Weather Message Code: ALTK05
Serial Number: 1937
Issue Time: 2026 Jan 10 2035 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Jan 10 2035 UTC
Synoptic Period: 1800-2100 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
20:32 UTC
Space Weather Message Code: SUMSUD
Serial Number: 292
Issue Time: 2026 Jan 10 2032 UTC
SUMMARY: Geomagnetic Sudden Impulse
Observed: 2026 Jan 10 2013 UTC
Deviation: 47 nT
Station: HAD
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
19:56 UTC
Space Weather Message Code: WARSUD
Serial Number: 248
Issue Time: 2026 Jan 10 1956 UTC
WARNING: Geomagnetic Sudden Impulse expected
Valid From: 2026 Jan 10 2007 UTC
Valid To: 2026 Jan 10 2037 UTC
IP Shock Passage Observed: 2026 Jan 10 1942 UTC
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
15:42 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3597
Issue Time: 2026 Jan 10 1542 UTC
ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2026 Jan 10 1525 UTC
Station: GOES19
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
14:56 UTC
Space Weather Message Code: WARK05
Serial Number: 2167
Issue Time: 2026 Jan 10 1456 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 Jan 10 1455 UTC
Valid To: 2026 Jan 10 2359 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
09:04 UTC
Space Weather Message Code: ALTK04
Serial Number: 2623
Issue Time: 2026 Jan 10 0904 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Jan 10 0859 UTC
Synoptic Period: 0600-0900 UTC
Active Warning: Yes
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
07:33 UTC
Space Weather Message Code: WARK04
Serial Number: 5214
Issue Time: 2026 Jan 10 0733 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Jan 10 0732 UTC
Valid To: 2026 Jan 10 2359 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
Friday, 9 January 2026
20:41 UTC
Space Weather Message Code: WARK04
Serial Number: 5213
Issue Time: 2026 Jan 09 2041 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Jan 09 2041 UTC
Valid To: 2026 Jan 10 0600 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
20:06 UTC
Space Weather Message Code: WATA20
Serial Number: 1087
Issue Time: 2026 Jan 09 2006 UTC
WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day:
Jan 10: G1 (Minor) Jan 11: G1 (Minor) Jan 12: None (Below G1)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Comment: CMEs associated with a filament eruption from 08 Jan, coupled with ongoing CH HSS effects, are likely to bring G1 (Minor) geomagnetic storming conditions by late 10 Jan continuing into 11 Jan.
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
15:17 UTC
Space Weather Message Code: ALTTP2
Serial Number: 1465
Issue Time: 2026 Jan 09 1517 UTC
ALERT: Type II Radio Emission
Begin Time: 2026 Jan 09 1244 UTC
Estimated Velocity: 200 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.
11:26 UTC
Space Weather Message Code: WARK04
Serial Number: 5212
Issue Time: 2026 Jan 09 1126 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5211
Valid From: 2026 Jan 09 0140 UTC
Now Valid Until: 2026 Jan 09 1800 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
10:59 UTC
Space Weather Message Code: ALTTP4
Serial Number: 703
Issue Time: 2026 Jan 09 1059 UTC
ALERT: Type IV Radio Emission
Begin Time: 2026 Jan 09 0944 UTC
Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.
10:24 UTC
Space Weather Message Code: ALTTP2
Serial Number: 1464
Issue Time: 2026 Jan 09 1024 UTC
ALERT: Type II Radio Emission
Begin Time: 2026 Jan 09 0932 UTC
Estimated Velocity: 203 km/s
Comment: Current imagery does not suggest any on-disk source at this time.
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.
08:48 UTC
Space Weather Message Code: WARK04
Serial Number: 5211
Issue Time: 2026 Jan 09 0848 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5210
Valid From: 2026 Jan 09 0140 UTC
Now Valid Until: 2026 Jan 09 1200 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
03:06 UTC
Space Weather Message Code: ALTK04
Serial Number: 2622
Issue Time: 2026 Jan 09 0306 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Jan 09 0300 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
01:42 UTC
Space Weather Message Code: WARK04
Serial Number: 5210
Issue Time: 2026 Jan 09 0142 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Jan 09 0140 UTC
Valid To: 2026 Jan 09 0900 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
Thursday, 8 January 2026
20:40 UTC
Space Weather Message Code: ALTTP2
Serial Number: 1463
Issue Time: 2026 Jan 08 2040 UTC
ALERT: Type II Radio Emission
Begin Time: 2026 Jan 08 1944 UTC
Estimated Velocity: 855 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.
18:57 UTC
Space Weather Message Code: ALTTP4
Serial Number: 702
Issue Time: 2026 Jan 08 1857 UTC
ALERT: Type IV Radio Emission
Begin Time: 2026 Jan 08 1737 UTC
Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.
05:55 UTC
Space Weather Message Code: WARK04
Serial Number: 5209
Issue Time: 2026 Jan 08 0555 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5208
Valid From: 2026 Jan 08 0120 UTC
Now Valid Until: 2026 Jan 08 1200 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
01:43 UTC
Space Weather Message Code: WARK05
Serial Number: 2166
Issue Time: 2026 Jan 08 0143 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 Jan 08 0140 UTC
Valid To: 2026 Jan 08 0600 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
01:39 UTC
Space Weather Message Code: ALTK04
Serial Number: 2621
Issue Time: 2026 Jan 08 0139 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Jan 08 0137 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
01:23 UTC
Space Weather Message Code: WARK04
Serial Number: 5208
Issue Time: 2026 Jan 08 0123 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Jan 08 0120 UTC
Valid To: 2026 Jan 08 0600 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
Wednesday, 7 January 2026
15:22 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3596
Issue Time: 2026 Jan 07 1522 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3595
Begin Time: 2026 Jan 06 1540 UTC
Yesterday Maximum 2MeV Flux: 1326 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Tuesday, 6 January 2026
22:18 UTC
Space Weather Message Code: WATA20
Serial Number: 1086
Issue Time: 2026 Jan 06 2218 UTC
WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day:
Jan 07: None (Below G1) Jan 08: None (Below G1) Jan 09: G1 (Minor)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
16:22 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3595
Issue Time: 2026 Jan 06 1622 UTC
ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2026 Jan 06 1540 UTC
Station: GOES19
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Monday, 5 January 2026
11:55 UTC
Space Weather Message Code: WARK04
Serial Number: 5207
Issue Time: 2026 Jan 05 1155 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5206
Valid From: 2026 Jan 04 2207 UTC
Now Valid Until: 2026 Jan 05 1800 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
05:16 UTC
Space Weather Message Code: ALTK04
Serial Number: 2620
Issue Time: 2026 Jan 05 0516 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Jan 05 0515 UTC
Synoptic Period: 0300-0600 UTC
Active Warning: Yes
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
Sunday, 4 January 2026
22:07 UTC
Space Weather Message Code: WARK04
Serial Number: 5206
Issue Time: 2026 Jan 04 2207 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Jan 04 2207 UTC
Valid To: 2026 Jan 05 1200 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
14:37 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3594
Issue Time: 2026 Jan 04 1437 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3593
Begin Time: 2025 Dec 21 1425 UTC
Yesterday Maximum 2MeV Flux: 1940 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Saturday, 3 January 2026
13:48 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3593
Issue Time: 2026 Jan 03 1348 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3592
Begin Time: 2025 Dec 21 1425 UTC
Yesterday Maximum 2MeV Flux: 4197 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
00:07 UTC
Space Weather Message Code: ALTK05
Serial Number: 1936
Issue Time: 2026 Jan 03 0007 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Jan 02 2359 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
Friday, 2 January 2026
20:28 UTC
Space Weather Message Code: WARK06
Serial Number: 630
Issue Time: 2026 Jan 02 2028 UTC
WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2026 Jan 02 2030 UTC
Valid To: 2026 Jan 03 0600 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
19:44 UTC
Space Weather Message Code: WARK04
Serial Number: 5205
Issue Time: 2026 Jan 02 1944 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5204
Valid From: 2026 Jan 02 1435 UTC
Now Valid Until: 2026 Jan 03 1500 UTC
Warning Condition: persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
19:30 UTC
Space Weather Message Code: ALTK05
Serial Number: 1935
Issue Time: 2026 Jan 02 1930 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Jan 02 1925 UTC
Synoptic Period: 1800-2100 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
19:21 UTC
Space Weather Message Code: WARK05
Serial Number: 2165
Issue Time: 2026 Jan 02 1921 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 Jan 02 1920 UTC
Valid To: 2026 Jan 03 0600 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
19:20 UTC
Space Weather Message Code: WARK04
Serial Number: 5204
Issue Time: 2026 Jan 02 1920 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5203
Valid From: 2026 Jan 02 1435 UTC
Now Valid Until: 2026 Jan 03 0900 UTC
Warning Condition: persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
19:10 UTC
Space Weather Message Code: ALTK04
Serial Number: 2619
Issue Time: 2026 Jan 02 1910 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Jan 02 1906 UTC
Synoptic Period: 1800-2100 UTC
Active Warning: Yes
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
17:01 UTC
Space Weather Message Code: WATA20
Serial Number: 1085
Issue Time: 2026 Jan 02 1701 UTC
WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day:
Jan 02: G1 (Minor) Jan 03: G2 (Moderate) Jan 04: G1 (Minor)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
14:35 UTC
Space Weather Message Code: WARK04
Serial Number: 5203
Issue Time: 2026 Jan 02 1435 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Jan 02 1435 UTC
Valid To: 2026 Jan 02 2359 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
12:21 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3592
Issue Time: 2026 Jan 02 1221 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3591
Begin Time: 2025 Dec 21 1425 UTC
Yesterday Maximum 2MeV Flux: 1919 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
05:23 UTC
Space Weather Message Code: ALTK04
Serial Number: 2618
Issue Time: 2026 Jan 02 0523 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Jan 02 0523 UTC
Synoptic Period: 0300-0600 UTC
Active Warning: Yes
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
05:08 UTC
Space Weather Message Code: WARK04
Serial Number: 5202
Issue Time: 2026 Jan 02 0508 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Jan 02 0508 UTC
Valid To: 2026 Jan 02 1200 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
03:22 UTC
Space Weather Message Code: ALTTP2
Serial Number: 1462
Issue Time: 2026 Jan 02 0322 UTC
ALERT: Type II Radio Emission
Begin Time: 2026 Jan 01 0256 UTC
Estimated Velocity: 314 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.
Thursday, 1 January 2026
14:44 UTC
Space Weather Message Code: WARK04
Serial Number: 5201
Issue Time: 2026 Jan 01 1444 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Jan 01 1444 UTC
Valid To: 2026 Jan 01 2359 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
08:43 UTC
Space Weather Message Code: WARK04
Serial Number: 5200
Issue Time: 2026 Jan 01 0843 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5199
Valid From: 2026 Jan 01 0430 UTC
Now Valid Until: 2026 Jan 01 1200 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
04:09 UTC
Space Weather Message Code: WARK04
Serial Number: 5199
Issue Time: 2026 Jan 01 0409 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Jan 01 0430 UTC
Valid To: 2026 Jan 01 0900 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
Wednesday, 31 December 2025
22:59 UTC
Space Weather Message Code: WATA30
Serial Number: 263
Issue Time: 2025 Dec 31 2259 UTC
WATCH: Geomagnetic Storm Category G2 Predicted
Highest Storm Level Predicted by Day:
Jan 01: G1 (Minor) Jan 02: G1 (Minor) Jan 03: G2 (Moderate)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
16:32 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3591
Issue Time: 2025 Dec 31 1632 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3590
Begin Time: 2025 Dec 21 1425 UTC
Yesterday Maximum 2MeV Flux: 5613 pfu
Comment: Electrons went over threshold at 31/1255 through 31/1530 UTC.
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
14:25 UTC
Space Weather Message Code: SUMXM5
Serial Number: 303
Issue Time: 2025 Dec 31 1425 UTC
SUMMARY: X-ray Event exceeded M5
Begin Time: 2025 Dec 31 1312 UTC
Maximum Time: 2025 Dec 31 1351 UTC
End Time: 2025 Dec 31 1411 UTC
X-ray Class: M7.1
Location: N24E19
NOAA Scale: R2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth.
Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.
14:19 UTC
Space Weather Message Code: SUM10R
Serial Number: 898
Issue Time: 2025 Dec 31 1419 UTC
SUMMARY: 10cm Radio Burst
Begin Time: 2025 Dec 31 1331 UTC
Maximum Time: 2025 Dec 31 1348 UTC
End Time: 2025 Dec 31 1353 UTC
Duration: 22 minutes
Peak Flux: 550 sfu
Latest Penticton Noon Flux: 182 sfu
Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.
14:01 UTC
Space Weather Message Code: ALTTP4
Serial Number: 701
Issue Time: 2025 Dec 31 1401 UTC
ALERT: Type IV Radio Emission
Begin Time: 2025 Dec 31 1342 UTC
Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.
14:00 UTC
Space Weather Message Code: ALTTP2
Serial Number: 1461
Issue Time: 2025 Dec 31 1400 UTC
ALERT: Type II Radio Emission
Begin Time: 2025 Dec 31 1333 UTC
Estimated Velocity: 893 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.
13:44 UTC
Space Weather Message Code: ALTXMF
Serial Number: 507
Issue Time: 2025 Dec 31 1344 UTC
ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2025 Dec 31 1342 UTC
NOAA Scale: R2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.
13:36 UTC
Space Weather Message Code: WARK04
Serial Number: 5198
Issue Time: 2025 Dec 31 1336 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Dec 31 1335 UTC
Valid To: 2025 Dec 31 2100 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
Tuesday, 30 December 2025
05:02 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3590
Issue Time: 2025 Dec 30 0502 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3589
Begin Time: 2025 Dec 21 1425 UTC
Yesterday Maximum 2MeV Flux: 6690 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Monday, 29 December 2025
15:42 UTC
Space Weather Message Code: WATA20
Serial Number: 1084
Issue Time: 2025 Dec 29 1542 UTC
WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day:
Dec 30: None (Below G1) Dec 31: None (Below G1) Jan 01: G1 (Minor)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
08:06 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3589
Issue Time: 2025 Dec 29 0806 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3588
Begin Time: 2025 Dec 21 1425 UTC
Yesterday Maximum 2MeV Flux: 8999 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Sunday, 28 December 2025
22:55 UTC
Space Weather Message Code: SUM10R
Serial Number: 897
Issue Time: 2025 Dec 28 2255 UTC
SUMMARY: 10cm Radio Burst
Begin Time: 2025 Dec 28 2225 UTC
Maximum Time: 2025 Dec 28 2231 UTC
End Time: 2025 Dec 28 2236 UTC
Duration: 11 minutes
Peak Flux: 300 sfu
Latest Penticton Noon Flux: 188 sfu
Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.
04:59 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3588
Issue Time: 2025 Dec 28 0459 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3587
Begin Time: 2025 Dec 21 1425 UTC
Yesterday Maximum 2MeV Flux: 6123 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Saturday, 27 December 2025
05:07 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3587
Issue Time: 2025 Dec 27 0507 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3586
Begin Time: 2025 Dec 21 1425 UTC
Yesterday Maximum 2MeV Flux: 8195 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
03:24 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3586
Issue Time: 2025 Dec 27 0324 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3585
Begin Time: 2025 Dec 21 1425 UTC
Yesterday Maximum 2MeV Flux: 8195 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
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Space weather facts
| Last X-flare | 2026/01/18 | X1.9 |
| Last M-flare | 2026/01/21 | M3.4 |
| Last geomagnetic storm | 2026/01/22 | Kp5+ (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| December 2025 | 124 +32.2 |
| January 2026 | 119.1 -4.9 |
| Last 30 days | 122 +10.9 |