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Space Weather Alerts

Last updated: Dec 30, 2025 9:27:01 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: K05W Dec 12, 2025 2:42 PM 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: 2155
Issue Time: 2025 Dec 12 1942 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Dec 12 1940 UTC
Valid To: 2025 Dec 13 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.
Geomagnetic ID: K04W Dec 12, 2025 5:55 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: 5182
Issue Time: 2025 Dec 12 1055 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5181
Valid From: 2025 Dec 10 2040 UTC
Now Valid Until: 2025 Dec 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.
Radiation ID: TIVA Dec 12, 2025 12:58 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: 700
Issue Time: 2025 Dec 12 0558 UTC

ALERT: Type IV Radio Emission
Begin Time: 2025 Dec 12 0527 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: K05W Dec 12, 2025 12:55 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: 2154
Issue Time: 2025 Dec 12 0555 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2153
Valid From: 2025 Dec 11 1900 UTC
Now Valid Until: 2025 Dec 12 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.
Solar eruption ID: TIIA Dec 12, 2025 12:28 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: 1456
Issue Time: 2025 Dec 12 0528 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Dec 12 0508 UTC
Estimated Velocity: 410 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 11, 2025 6:39 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: 5181
Issue Time: 2025 Dec 11 2339 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5180
Valid From: 2025 Dec 10 2040 UTC
Now Valid Until: 2025 Dec 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.
Geomagnetic ID: K05W Dec 11, 2025 6:39 PM 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: 2153
Issue Time: 2025 Dec 11 2339 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2152
Valid From: 2025 Dec 11 1900 UTC
Now Valid Until: 2025 Dec 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.
Geomagnetic ID: K05A Dec 11, 2025 3:59 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: 1927
Issue Time: 2025 Dec 11 2059 UTC

ALERT: Geomagnetic K-index of 5
 Threshold Reached: 2025 Dec 11 1914 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.
Geomagnetic ID: K05W Dec 11, 2025 2:19 PM 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: 2152
Issue Time: 2025 Dec 11 1919 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Dec 11 1900 UTC
Valid To: 2025 Dec 12 0000 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.
Geomagnetic ID: K05W Dec 10, 2025 10:39 PM 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: 2151
Issue Time: 2025 Dec 11 0339 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2150
Valid From: 2025 Dec 10 2115 UTC
Now Valid Until: 2025 Dec 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 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 10, 2025 10:37 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: 5180
Issue Time: 2025 Dec 11 0337 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5179
Valid From: 2025 Dec 10 2040 UTC
Now Valid Until: 2025 Dec 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.
Geomagnetic ID: K06W Dec 10, 2025 9:55 PM EST
Space Weather Message Code: WARK06
Plain English: Earth’s magnetic field is disturbed. This can increase aurora chances and sometimes affect radio/GPS.
 
Space Weather Message Code: WARK06
Serial Number: 629
Issue Time: 2025 Dec 11 0255 UTC

EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 628
Valid From: 2025 Dec 10 2200 UTC
Now Valid Until: 2025 Dec 11 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.
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