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Space Weather Alerts

Last updated: Dec 31, 2025 1:50:31 AM EST • Cache: OK • Results: 136
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Search and filter official NOAA SWPC bulletins. Each one has a plain-English explanation.
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Geomagnetic ID: K04W Dec 5, 2025 9:06 PM EST
Space Weather Message Code: WARK04
Plain English: Earth’s magnetic field is disturbed. This can increase aurora chances and sometimes affect radio/GPS.
 
Space Weather Message Code: WARK04
Serial Number: 5174
Issue Time: 2025 Dec 06 0206 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Dec 06 0205 UTC
Valid To: 2025 Dec 06 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.
Geomagnetic ID: A20F Dec 5, 2025 2:22 PM EST
Space Weather Message Code: WATA20
Plain English: Earth’s magnetic field is disturbed. This can increase aurora chances and sometimes affect radio/GPS.
 
Space Weather Message Code: WATA20
Serial Number: 1080
Issue Time: 2025 Dec 05 1922 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Dec 06:  None (Below G1)   Dec 07:  G1 (Minor)   Dec 08:  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.
Update ID: EF3A Dec 5, 2025 10:45 AM EST
Space Weather Message Code: ALTEF3
Plain English: General space weather update.
 
Space Weather Message Code: ALTEF3
Serial Number: 3571
Issue Time: 2025 Dec 05 1545 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2025 Dec 05 1530 UTC
Station: GOES-19
 



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Geomagnetic ID: A20F Dec 4, 2025 4:29 PM EST
Space Weather Message Code: WATA20
Plain English: Earth’s magnetic field is disturbed. This can increase aurora chances and sometimes affect radio/GPS.
 
Space Weather Message Code: WATA20
Serial Number: 1079
Issue Time: 2025 Dec 04 2129 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Dec 05:  None (Below G1)   Dec 06:  None (Below G1)   Dec 07:  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.
Geomagnetic ID: K04W Dec 4, 2025 8:21 AM EST
Space Weather Message Code: WARK04
Plain English: Earth’s magnetic field is disturbed. This can increase aurora chances and sometimes affect radio/GPS.
 
Space Weather Message Code: WARK04
Serial Number: 5173
Issue Time: 2025 Dec 04 1321 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5172
Valid From: 2025 Dec 03 1022 UTC
Now Valid Until: 2025 Dec 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.
Geomagnetic ID: K05W Dec 4, 2025 6:58 AM EST
Space Weather Message Code: WARK05
Plain English: Earth’s magnetic field is disturbed. This can increase aurora chances and sometimes affect radio/GPS.
 
Space Weather Message Code: WARK05
Serial Number: 2147
Issue Time: 2025 Dec 04 1158 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2146
Valid From: 2025 Dec 03 1425 UTC
Now Valid Until: 2025 Dec 05 0000 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.
Radiation ID: TIVA Dec 4, 2025 4:00 AM EST
Space Weather Message Code: ALTTP4
Plain English: Higher-energy particles may increase. This mostly matters for satellites, aviation, and polar routes.
 
Space Weather Message Code: ALTTP4
Serial Number: 697
Issue Time: 2025 Dec 04 0900 UTC

ALERT: Type IV Radio Emission
Begin Time: 2025 Dec 04 0832 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.
Geomagnetic ID: K05A Dec 4, 2025 3:55 AM EST
Space Weather Message Code: ALTK05
Plain English: Earth’s magnetic field is disturbed. This can increase aurora chances and sometimes affect radio/GPS.
 
Space Weather Message Code: ALTK05
Serial Number: 1925
Issue Time: 2025 Dec 04 0855 UTC

ALERT: Geomagnetic K-index of 5
 Threshold Reached: 2025 Dec 04 0852 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.
Geomagnetic ID: K05A Dec 3, 2025 11:53 PM EST
Space Weather Message Code: ALTK05
Plain English: Earth’s magnetic field is disturbed. This can increase aurora chances and sometimes affect radio/GPS.
 
Space Weather Message Code: ALTK05
Serial Number: 1924
Issue Time: 2025 Dec 04 0453 UTC

ALERT: Geomagnetic K-index of 5
 Threshold Reached: 2025 Dec 04 0445 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.
Radio ID: XM5S Dec 3, 2025 10:08 PM EST
Space Weather Message Code: SUMXM5
Plain English: HF/shortwave radio conditions may worsen (signal fade or blackout), especially on the daylight side of Earth.
 
Space Weather Message Code: SUMXM5
Serial Number: 300
Issue Time: 2025 Dec 04 0308 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2025 Dec 04 0236 UTC
Maximum Time: 2025 Dec 04 0250 UTC
End Time: 2025 Dec 04 0259 UTC
X-ray Class: M6.0
Optical Class: na
Location: N07E50
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.
Solar eruption ID: TIIA Dec 3, 2025 10:03 PM EST
Space Weather Message Code: ALTTP2
Plain English: A CME/eruption can lead to geomagnetic impacts later if it’s headed toward Earth.
 
Space Weather Message Code: ALTTP2
Serial Number: 1450
Issue Time: 2025 Dec 04 0303 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Dec 04 0246 UTC
Estimated Velocity: 345 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.
Geomagnetic ID: K05A Dec 3, 2025 9:53 PM EST
Space Weather Message Code: ALTK05
Plain English: Earth’s magnetic field is disturbed. This can increase aurora chances and sometimes affect radio/GPS.
 
Space Weather Message Code: ALTK05
Serial Number: 1923
Issue Time: 2025 Dec 04 0253 UTC

ALERT: Geomagnetic K-index of 5
 Threshold Reached: 2025 Dec 04 0247 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.
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