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Space Weather Alerts

Last updated: Dec 30, 2025 4:12:55 AM EST • Cache: OK • Results: 143
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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 17, 2025 3:45 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: 5186
Issue Time: 2025 Dec 17 2045 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Dec 17 2044 UTC
Valid To: 2025 Dec 18 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.
Update ID: EF3A Dec 17, 2025 10:06 AM EST
Space Weather Message Code: ALTEF3
Plain English: General space weather update.
 
Space Weather Message Code: ALTEF3
Serial Number: 3576
Issue Time: 2025 Dec 17 1506 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2025 Dec 17 1405 UTC
Station: GOES19
 



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Geomagnetic ID: A20F Dec 16, 2025 7:04 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: 1082
Issue Time: 2025 Dec 17 0004 UTC

CANCEL WATCH: Geomagnetic Storm Category G1 Predicted
Cancel Serial Number: 1081
Original Issue Time: 2025 Dec 15 2245 UTC

Comment: Conditions no longer warrant watch.

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 15, 2025 8:11 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: 5185
Issue Time: 2025 Dec 16 0111 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Dec 16 0110 UTC
Valid To: 2025 Dec 16 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.
Geomagnetic ID: A20F Dec 15, 2025 5:45 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: 1081
Issue Time: 2025 Dec 15 2245 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Dec 16:  None (Below G1)   Dec 17:  None (Below G1)   Dec 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.
Solar eruption ID: TIIA Dec 14, 2025 4:32 AM 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: 1458
Issue Time: 2025 Dec 14 0932 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Dec 14 0744 UTC
Estimated Velocity: 585 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: K04W Dec 13, 2025 9:56 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: 5184
Issue Time: 2025 Dec 13 1456 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5183
Valid From: 2025 Dec 10 2040 UTC
Now Valid Until: 2025 Dec 14 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.
Solar eruption ID: TIIA Dec 13, 2025 6:06 AM 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: 1457
Issue Time: 2025 Dec 13 1106 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Dec 13 1049 UTC
Estimated Velocity: 778 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 12, 2025 10:02 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: 1930
Issue Time: 2025 Dec 13 0302 UTC

ALERT: Geomagnetic K-index of 5
 Threshold Reached: 2025 Dec 13 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.
Geomagnetic ID: K05A Dec 12, 2025 5:50 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: 1929
Issue Time: 2025 Dec 12 2250 UTC

ALERT: Geomagnetic K-index of 5
 Threshold Reached: 2025 Dec 12 2248 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.
Geomagnetic ID: K04W Dec 12, 2025 5:37 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: 5183
Issue Time: 2025 Dec 12 2237 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5182
Valid From: 2025 Dec 10 2040 UTC
Now Valid Until: 2025 Dec 13 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.
Geomagnetic ID: K05A Dec 12, 2025 2:43 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: 1928
Issue Time: 2025 Dec 12 1943 UTC

ALERT: Geomagnetic K-index of 5
 Threshold Reached: 2025 Dec 12 1942 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.
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