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.

Monday, 23 December 2024

20:58 UTC

Space Weather Message Code: WATA20
Serial Number: 1020
Issue Time: 2024 Dec 23 2058 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Dec 24: None (Below G1) Dec 25: G1 (Minor) Dec 26: 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.

17:23 UTC

Space Weather Message Code: WARK04
Serial Number: 4784
Issue Time: 2024 Dec 23 1723 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Dec 23 1730 UTC
Valid To: 2024 Dec 23 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.

15:38 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3409
Issue Time: 2024 Dec 23 1538 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2024 Dec 23 1520 UTC
Station: GOES-16




Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

11:41 UTC

Space Weather Message Code: SUMXM5
Serial Number: 274
Issue Time: 2024 Dec 23 1141 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2024 Dec 23 1106 UTC
Maximum Time: 2024 Dec 23 1112 UTC
End Time: 2024 Dec 23 1116 UTC
X-ray Class: M8.9
Location: S18E30
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.

11:25 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1384
Issue Time: 2024 Dec 23 1125 UTC

ALERT: Type II Radio Emission
Begin Time: 2024 Dec 23 1111 UTC
Estimated Velocity: 731 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.

11:21 UTC

Space Weather Message Code: SUM10R
Serial Number: 853
Issue Time: 2024 Dec 23 1121 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2024 Dec 23 1109 UTC
Maximum Time: 2024 Dec 23 1109 UTC
End Time: 2024 Dec 23 1109 UTC
Duration: 1 minutes
Peak Flux: 320 sfu
Latest Penticton Noon Flux: 223 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.

11:11 UTC

Space Weather Message Code: ALTXMF
Serial Number: 457
Issue Time: 2024 Dec 23 1111 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Dec 23 1110 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.

03:01 UTC

Space Weather Message Code: ALTK04
Serial Number: 2510
Issue Time: 2024 Dec 23 0301 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Dec 23 0259 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.

Sunday, 22 December 2024

23:02 UTC

Space Weather Message Code: WARK04
Serial Number: 4783
Issue Time: 2024 Dec 22 2302 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Dec 22 2302 UTC
Valid To: 2024 Dec 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.

Saturday, 21 December 2024

23:54 UTC

Space Weather Message Code: WARK04
Serial Number: 4782
Issue Time: 2024 Dec 21 2354 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4781
Valid From: 2024 Dec 21 2059 UTC
Now Valid Until: 2024 Dec 22 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.

21:02 UTC

Space Weather Message Code: ALTK04
Serial Number: 2509
Issue Time: 2024 Dec 21 2102 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Dec 21 2059 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.

21:02 UTC

Space Weather Message Code: WARK04
Serial Number: 4781
Issue Time: 2024 Dec 21 2102 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Dec 21 2059 UTC
Valid To: 2024 Dec 21 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.

20:26 UTC

Space Weather Message Code: ALTTP4
Serial Number: 673
Issue Time: 2024 Dec 21 2026 UTC

ALERT: Type IV Radio Emission
Begin Time: 2024 Dec 21 1942 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.

20:26 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1383
Issue Time: 2024 Dec 21 2026 UTC

ALERT: Type II Radio Emission
Begin Time: 2024 Dec 21 1939 UTC
Estimated Velocity: 1314 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.

02:45 UTC

Space Weather Message Code: SUM10R
Serial Number: 852
Issue Time: 2024 Dec 21 0245 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2024 Dec 21 0037 UTC
Maximum Time: 2024 Dec 21 0038 UTC
End Time: 2024 Dec 21 0038 UTC
Duration: 1 minutes
Peak Flux: 229 sfu
Latest Penticton Noon Flux: 184 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.

01:35 UTC

Space Weather Message Code: WARK04
Serial Number: 4780
Issue Time: 2024 Dec 21 0135 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Dec 21 0133 UTC
Valid To: 2024 Dec 21 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.

Friday, 20 December 2024

11:29 UTC

Space Weather Message Code: SUM10R
Serial Number: 851
Issue Time: 2024 Dec 20 1129 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2024 Dec 20 1118 UTC
Maximum Time: 2024 Dec 20 1118 UTC
End Time: 2024 Dec 20 1118 UTC
Duration: 1 minutes
Peak Flux: 220 sfu
Latest Penticton Noon Flux: 176 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.

10:30 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1382
Issue Time: 2024 Dec 20 1030 UTC

ALERT: Type II Radio Emission
Begin Time: 2024 Dec 20 1013 UTC
Estimated Velocity: 726 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.

03:01 UTC

Space Weather Message Code: ALTK04
Serial Number: 2508
Issue Time: 2024 Dec 20 0301 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Dec 20 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.

00:58 UTC

Space Weather Message Code: WARK04
Serial Number: 4779
Issue Time: 2024 Dec 20 0058 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Dec 20 0057 UTC
Valid To: 2024 Dec 20 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, 18 December 2024

23:57 UTC

Space Weather Message Code: WARK04
Serial Number: 4778
Issue Time: 2024 Dec 18 2357 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4777
Valid From: 2024 Dec 16 1935 UTC
Now Valid Until: 2024 Dec 19 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.

17:55 UTC

Space Weather Message Code: WARK04
Serial Number: 4777
Issue Time: 2024 Dec 18 1755 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4776
Valid From: 2024 Dec 16 1935 UTC
Now Valid Until: 2024 Dec 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.

11:54 UTC

Space Weather Message Code: WARK04
Serial Number: 4776
Issue Time: 2024 Dec 18 1154 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4775
Valid From: 2024 Dec 16 1935 UTC
Now Valid Until: 2024 Dec 18 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.

05:54 UTC

Space Weather Message Code: WARK04
Serial Number: 4775
Issue Time: 2024 Dec 18 0554 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4774
Valid From: 2024 Dec 16 1935 UTC
Now Valid Until: 2024 Dec 18 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.

Tuesday, 17 December 2024

17:54 UTC

Space Weather Message Code: WARK04
Serial Number: 4774
Issue Time: 2024 Dec 17 1754 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4773
Valid From: 2024 Dec 16 1935 UTC
Now Valid Until: 2024 Dec 18 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.

17:54 UTC

Space Weather Message Code: WARK05
Serial Number: 1957
Issue Time: 2024 Dec 17 1754 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1956
Valid From: 2024 Dec 17 0411 UTC
Now Valid Until: 2024 Dec 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 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.

11:51 UTC

Space Weather Message Code: WARK04
Serial Number: 4773
Issue Time: 2024 Dec 17 1151 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4772
Valid From: 2024 Dec 16 1935 UTC
Now Valid Until: 2024 Dec 17 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.

11:51 UTC

Space Weather Message Code: WARK05
Serial Number: 1956
Issue Time: 2024 Dec 17 1151 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1955
Valid From: 2024 Dec 17 0411 UTC
Now Valid Until: 2024 Dec 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.

08:07 UTC

Space Weather Message Code: ALTK05
Serial Number: 1681
Issue Time: 2024 Dec 17 0807 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Dec 17 0755 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.

05:26 UTC

Space Weather Message Code: SUMSUD
Serial Number: 282
Issue Time: 2024 Dec 17 0526 UTC

SUMMARY: Geomagnetic Sudden Impulse
Observed: 2024 Dec 17 0519 UTC
Deviation: 24 nT
Station: Sitka

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

05:21 UTC

Space Weather Message Code: ALTK05
Serial Number: 1680
Issue Time: 2024 Dec 17 0521 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Dec 17 0518 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.

05:03 UTC

Space Weather Message Code: WARK06
Serial Number: 555
Issue Time: 2024 Dec 17 0503 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2024 Dec 17 0503 UTC
Valid To: 2024 Dec 17 1200 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.

04:50 UTC

Space Weather Message Code: WARSUD
Serial Number: 238
Issue Time: 2024 Dec 17 0450 UTC

WARNING: Geomagnetic Sudden Impulse expected
Valid From: 2024 Dec 17 0515 UTC
Valid To: 2024 Dec 17 0600 UTC
IP Shock Passage Observed: 2024 Dec 17 0445 UTC

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

04:12 UTC

Space Weather Message Code: WARK05
Serial Number: 1955
Issue Time: 2024 Dec 17 0412 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2024 Dec 17 0411 UTC
Valid To: 2024 Dec 17 1200 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.

Monday, 16 December 2024

23:41 UTC

Space Weather Message Code: WARK04
Serial Number: 4772
Issue Time: 2024 Dec 16 2341 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4771
Valid From: 2024 Dec 16 1935 UTC
Now Valid Until: 2024 Dec 17 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.

20:59 UTC

Space Weather Message Code: ALTK04
Serial Number: 2507
Issue Time: 2024 Dec 16 2059 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Dec 16 2059 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.

19:35 UTC

Space Weather Message Code: WARK04
Serial Number: 4771
Issue Time: 2024 Dec 16 1935 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Dec 16 1935 UTC
Valid To: 2024 Dec 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.

Sunday, 15 December 2024

17:07 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1381
Issue Time: 2024 Dec 15 1707 UTC

ALERT: Type II Radio Emission
Begin Time: 2024 Dec 15 1427 UTC
Estimated Velocity: 320 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.

Saturday, 14 December 2024

23:56 UTC

Space Weather Message Code: WARK04
Serial Number: 4770
Issue Time: 2024 Dec 14 2356 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4769
Valid From: 2024 Dec 14 1637 UTC
Now Valid Until: 2024 Dec 15 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.

16:40 UTC

Space Weather Message Code: WARK04
Serial Number: 4769
Issue Time: 2024 Dec 14 1640 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Dec 14 1637 UTC
Valid To: 2024 Dec 14 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, 12 December 2024

15:04 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3408
Issue Time: 2024 Dec 12 1504 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2024 Dec 12 1445 UTC
Station: GOES16




Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Wednesday, 11 December 2024

16:10 UTC

Space Weather Message Code: SUMXM5
Serial Number: 273
Issue Time: 2024 Dec 11 1610 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2024 Dec 11 1532 UTC
Maximum Time: 2024 Dec 11 1549 UTC
End Time: 2024 Dec 11 1556 UTC
X-ray Class: M6.7
Location: S06W94
NOAA Scale: R2 - Moderate

Comment: Flare occurred from departed Region 3912.

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.

15:50 UTC

Space Weather Message Code: ALTXMF
Serial Number: 456
Issue Time: 2024 Dec 11 1550 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Dec 11 1548 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.

Tuesday, 10 December 2024

07:14 UTC

Space Weather Message Code: SUMXM5
Serial Number: 272
Issue Time: 2024 Dec 10 0714 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2024 Dec 10 0636 UTC
Maximum Time: 2024 Dec 10 0648 UTC
End Time: 2024 Dec 10 0655 UTC
X-ray Class: M6.4
Optical Class: na
Location: S18W73
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.

06:50 UTC

Space Weather Message Code: ALTXMF
Serial Number: 455
Issue Time: 2024 Dec 10 0650 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Dec 10 0647 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.

00:02 UTC

Space Weather Message Code: ALTK04
Serial Number: 2506
Issue Time: 2024 Dec 10 0002 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Dec 09 2359 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.

Monday, 9 December 2024

22:18 UTC

Space Weather Message Code: WARK04
Serial Number: 4768
Issue Time: 2024 Dec 09 2218 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Dec 09 2217 UTC
Valid To: 2024 Dec 10 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.

02:16 UTC

Space Weather Message Code: ALTK04
Serial Number: 2505
Issue Time: 2024 Dec 09 0216 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Dec 09 0215 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.

01:31 UTC

Space Weather Message Code: WARK04
Serial Number: 4767
Issue Time: 2024 Dec 09 0131 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Dec 09 0130 UTC
Valid To: 2024 Dec 09 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 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, 8 December 2024

09:28 UTC

Space Weather Message Code: SUMX01
Serial Number: 182
Issue Time: 2024 Dec 08 0928 UTC

SUMMARY: X-ray Event exceeded X1
Begin Time: 2024 Dec 08 0850 UTC
Maximum Time: 2024 Dec 08 0906 UTC
End Time: 2024 Dec 08 0910 UTC
X-ray Class: X2.2
Optical Class: 2b
Location: S06W60
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.

09:25 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1380
Issue Time: 2024 Dec 08 0925 UTC

ALERT: Type II Radio Emission
Begin Time: 2024 Dec 08 0905 UTC
Estimated Velocity: 626 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.

09:21 UTC

Space Weather Message Code: SUM10R
Serial Number: 850
Issue Time: 2024 Dec 08 0921 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2024 Dec 08 0903 UTC
Maximum Time: 2024 Dec 08 0904 UTC
End Time: 2024 Dec 08 0906 UTC
Duration: 3 minutes
Peak Flux: 870 sfu
Latest Penticton Noon Flux: 183 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.

09:06 UTC

Space Weather Message Code: ALTXMF
Serial Number: 454
Issue Time: 2024 Dec 08 0906 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Dec 08 0905 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.

Thursday, 5 December 2024

11:11 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1379
Issue Time: 2024 Dec 05 1111 UTC

ALERT: Type II Radio Emission
Begin Time: 2024 Dec 05 1040 UTC
Estimated Velocity: 456 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.

Wednesday, 4 December 2024

10:46 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1378
Issue Time: 2024 Dec 04 1046 UTC

ALERT: Type II Radio Emission
Begin Time: 2024 Dec 04 1004 UTC
Estimated Velocity: 423 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.

Tuesday, 3 December 2024

08:55 UTC

Space Weather Message Code: WARK04
Serial Number: 4766
Issue Time: 2024 Dec 03 0855 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4765
Valid From: 2024 Dec 02 2321 UTC
Now Valid Until: 2024 Dec 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.

03:09 UTC

Space Weather Message Code: ALTK04
Serial Number: 2504
Issue Time: 2024 Dec 03 0309 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Dec 03 0259 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.

Monday, 2 December 2024

23:22 UTC

Space Weather Message Code: WARK04
Serial Number: 4765
Issue Time: 2024 Dec 02 2322 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Dec 02 2321 UTC
Valid To: 2024 Dec 03 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.

Saturday, 30 November 2024

02:42 UTC

Space Weather Message Code: ALTK05
Serial Number: 1679
Issue Time: 2024 Nov 30 0242 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Nov 30 0242 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.

01:55 UTC

Space Weather Message Code: WARK05
Serial Number: 1954
Issue Time: 2024 Nov 30 0155 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2024 Nov 30 0155 UTC
Valid To: 2024 Nov 30 1500 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.

01:24 UTC

Space Weather Message Code: ALTK04
Serial Number: 2503
Issue Time: 2024 Nov 30 0124 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Nov 30 0123 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.

01:15 UTC

Space Weather Message Code: WARK04
Serial Number: 4764
Issue Time: 2024 Nov 30 0115 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Nov 30 0112 UTC
Valid To: 2024 Nov 30 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 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, 29 November 2024

17:34 UTC

Space Weather Message Code: WATA30
Serial Number: 246
Issue Time: 2024 Nov 29 1734 UTC

CANCEL WATCH: Geomagnetic Storm Category G2 Predicted
Cancel Serial Number: 245
Original Issue Time: 2024 Nov 26 1749 UTC

Comment: G2 conditions are no longer anticipated.

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.

Tuesday, 26 November 2024

17:49 UTC

Space Weather Message Code: WATA30
Serial Number: 245
Issue Time: 2024 Nov 26 1749 UTC

WATCH: Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
Nov 27: None (Below G1) Nov 28: G1 (Minor) Nov 29: 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.

00:13 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1377
Issue Time: 2024 Nov 26 0013 UTC

ALERT: Type II Radio Emission
Begin Time: 2024 Nov 25 2200 UTC
Estimated Velocity: 490 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.

Monday, 25 November 2024

21:07 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1376
Issue Time: 2024 Nov 25 2107 UTC

ALERT: Type II Radio Emission
Begin Time: 2024 Nov 25 2043 UTC
Estimated Velocity: 248 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.

08:21 UTC

Space Weather Message Code: SUM10R
Serial Number: 849
Issue Time: 2024 Nov 25 0821 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2024 Nov 25 0733 UTC
Maximum Time: 2024 Nov 25 0734 UTC
End Time: 2024 Nov 25 0736 UTC
Duration: 3 minutes
Peak Flux: 210 sfu
Latest Penticton Noon Flux: 203 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.

08:15 UTC

Space Weather Message Code: SUMXM5
Serial Number: 271
Issue Time: 2024 Nov 25 0815 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2024 Nov 25 0724 UTC
Maximum Time: 2024 Nov 25 0742 UTC
End Time: 2024 Nov 25 0802 UTC
X-ray Class: M9.4
Location: N21E90
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.

07:38 UTC

Space Weather Message Code: ALTXMF
Serial Number: 453
Issue Time: 2024 Nov 25 0738 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Nov 25 0736 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.

Sunday, 24 November 2024

23:36 UTC

Space Weather Message Code: ALTK04
Serial Number: 2502
Issue Time: 2024 Nov 24 2336 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Nov 24 2328 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.

23:08 UTC

Space Weather Message Code: WARK04
Serial Number: 4763
Issue Time: 2024 Nov 24 2308 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Nov 24 2308 UTC
Valid To: 2024 Nov 25 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.