Local 12/13/2025, 2:56:12 PM
UTC 2025-12-13T14:56:12.210Z
Space Weather Message Code: WARK04Serial Number: 5184Issue Time: 2025 Dec 13 1456 UTCEXTENDED WARNING: Geomagnetic K-index of 4 expectedExtension to Serial Number: 5183Valid From: 2025 Dec 10 2040 UTCNow Valid Until: 2025 Dec 14 0600 UTCWarning Condition: PersistenceNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 12/13/2025, 11:06:54 AM
UTC 2025-12-13T11:06:54.183Z
Space Weather Message Code: ALTTP2Serial Number: 1457Issue Time: 2025 Dec 13 1106 UTCALERT: Type II Radio EmissionBegin Time: 2025 Dec 13 1049 UTCEstimated Velocity: 778 km/sDescription: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.
Local 12/13/2025, 3:02:17 AM
UTC 2025-12-13T03:02:17.843Z
Space Weather Message Code: ALTK05Serial Number: 1930Issue Time: 2025 Dec 13 0302 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2025 Dec 13 0259 UTCSynoptic Period: 0000-0300 UTCActive Warning: YesNOAA Scale: G1 - MinorNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 12/12/2025, 10:50:46 PM
UTC 2025-12-12T22:50:46.707Z
Space Weather Message Code: ALTK05Serial Number: 1929Issue Time: 2025 Dec 12 2250 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2025 Dec 12 2248 UTCSynoptic Period: 2100-2400 UTCActive Warning: YesNOAA Scale: G1 - MinorNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 12/12/2025, 10:37:40 PM
UTC 2025-12-12T22:37:40.237Z
Space Weather Message Code: WARK04Serial Number: 5183Issue Time: 2025 Dec 12 2237 UTCEXTENDED WARNING: Geomagnetic K-index of 4 expectedExtension to Serial Number: 5182Valid From: 2025 Dec 10 2040 UTCNow Valid Until: 2025 Dec 13 1500 UTCWarning Condition: PersistenceNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 12/12/2025, 7:43:20 PM
UTC 2025-12-12T19:43:20.580Z
Space Weather Message Code: ALTK05Serial Number: 1928Issue Time: 2025 Dec 12 1943 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2025 Dec 12 1942 UTCSynoptic Period: 1800-2100 UTCActive Warning: YesNOAA Scale: G1 - MinorNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 12/12/2025, 7:42:19 PM
UTC 2025-12-12T19:42:19.980Z
Space Weather Message Code: WARK05Serial Number: 2155Issue Time: 2025 Dec 12 1942 UTCWARNING: Geomagnetic K-index of 5 expectedValid From: 2025 Dec 12 1940 UTCValid To: 2025 Dec 13 0900 UTCWarning Condition: OnsetNOAA Scale: G1 - MinorNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 12/12/2025, 10:55:24 AM
UTC 2025-12-12T10:55:24.297Z
Space Weather Message Code: WARK04Serial Number: 5182Issue Time: 2025 Dec 12 1055 UTCEXTENDED WARNING: Geomagnetic K-index of 4 expectedExtension to Serial Number: 5181Valid From: 2025 Dec 10 2040 UTCNow Valid Until: 2025 Dec 12 2359 UTCWarning Condition: PersistenceNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 12/12/2025, 5:58:53 AM
UTC 2025-12-12T05:58:53.990Z
Space Weather Message Code: ALTTP4Serial Number: 700Issue Time: 2025 Dec 12 0558 UTCALERT: Type IV Radio EmissionBegin Time: 2025 Dec 12 0527 UTCDescription: 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.
Local 12/12/2025, 5:55:54 AM
UTC 2025-12-12T05:55:54.617Z
Space Weather Message Code: WARK05Serial Number: 2154Issue Time: 2025 Dec 12 0555 UTCEXTENDED WARNING: Geomagnetic K-index of 5 expectedExtension to Serial Number: 2153Valid From: 2025 Dec 11 1900 UTCNow Valid Until: 2025 Dec 12 0900 UTCWarning Condition: PersistenceNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.