Local 11/13/2025, 8:58:26 PM
UTC 2025-11-13T20:58:26.440Z
Space Weather Message Code: WARK04Serial Number: 5149Issue Time: 2025 Nov 13 2058 UTCEXTENDED WARNING: Geomagnetic K-index of 4 expectedExtension to Serial Number: 5148Valid From: 2025 Nov 11 2230 UTCNow Valid Until: 2025 Nov 14 1200 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 11/13/2025, 8:56:40 PM
UTC 2025-11-13T20:56:40.273Z
Space Weather Message Code: WARK06Serial Number: 626Issue Time: 2025 Nov 13 2056 UTCEXTENDED WARNING: Geomagnetic K-Index of 6 expectedExtension to Serial Number: 625Valid From: 2025 Nov 11 2344 UTCNow Valid Until: 2025 Nov 14 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 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.
Local 11/13/2025, 8:56:40 PM
UTC 2025-11-13T20:56:40.273Z
Space Weather Message Code: WARK05Serial Number: 2138Issue Time: 2025 Nov 13 2056 UTCEXTENDED WARNING: Geomagnetic K-index of 5 expectedExtension to Serial Number: 2137Valid From: 2025 Nov 11 2343 UTCNow Valid Until: 2025 Nov 14 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.
Local 11/13/2025, 3:38:58 PM
UTC 2025-11-13T15:38:58.450Z
Space Weather Message Code: WATA50Serial Number: 93Issue Time: 2025 Nov 13 1538 UTCWATCH: Geomagnetic Storm Category G3 PredictedHighest Storm Level Predicted by Day:Nov 13: G3 (Strong) Nov 14: G1 (Minor) Nov 15: None (Below G1)THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECTComment: Downgrading watch to G3 (Strong) for the remainder of 13 Nov as geomagnetic activity gradually subsides.NOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.Radio - HF (high frequency) radio may be intermittent.Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
Local 11/13/2025, 2:47:29 PM
UTC 2025-11-13T14:47:29.557Z
Space Weather Message Code: WARK06Serial Number: 625Issue Time: 2025 Nov 13 1447 UTCEXTENDED WARNING: Geomagnetic K-Index of 6 expectedExtension to Serial Number: 624Valid From: 2025 Nov 11 2344 UTCNow Valid Until: 2025 Nov 13 2100 UTCWarning Condition: PersistenceNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 11/13/2025, 2:36:21 PM
UTC 2025-11-13T14:36:21.703Z
Space Weather Message Code: ALTK05Serial Number: 1914Issue Time: 2025 Nov 13 1436 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2025 Nov 13 1435 UTCSynoptic Period: 1200-1500 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 11/13/2025, 11:45:22 AM
UTC 2025-11-13T11:45:22.990Z
Space Weather Message Code: WARPX1Serial Number: 615Issue Time: 2025 Nov 13 1145 UTCEXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expectedExtension to Serial Number: 614Valid From: 2025 Nov 10 1030 UTCNow Valid Until: 2025 Nov 13 2100 UTCWarning Condition: PersistencePredicted NOAA Scale: S1 - MinorNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.
Local 11/13/2025, 7:32:36 AM
UTC 2025-11-13T07:32:36.287Z
Space Weather Message Code: ALTK06Serial Number: 676Issue Time: 2025 Nov 13 0732 UTCALERT: Geomagnetic K-index of 6Threshold Reached: 2025 Nov 13 0723 UTCSynoptic Period: 0600-0900 UTCActive Warning: YesNOAA Scale: G2 - ModerateNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 11/13/2025, 7:32:36 AM
UTC 2025-11-13T07:32:36.270Z
Space Weather Message Code: WARK05Serial Number: 2137Issue Time: 2025 Nov 13 0732 UTCEXTENDED WARNING: Geomagnetic K-index of 5 expectedExtension to Serial Number: 2136Valid From: 2025 Nov 11 2343 UTCNow Valid Until: 2025 Nov 13 2100 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.
Local 11/13/2025, 7:32:36 AM
UTC 2025-11-13T07:32:36.240Z
Space Weather Message Code: WARK06Serial Number: 624Issue Time: 2025 Nov 13 0732 UTCEXTENDED WARNING: Geomagnetic K-Index of 6 expectedExtension to Serial Number: 623Valid From: 2025 Nov 11 2344 UTCNow Valid Until: 2025 Nov 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 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.
Local 11/13/2025, 7:04:28 AM
UTC 2025-11-13T07:04:28.103Z
Space Weather Message Code: ALTK05Serial Number: 1913Issue Time: 2025 Nov 13 0704 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2025 Nov 13 0647 UTCSynoptic Period: 0600-0900 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 11/13/2025, 6:03:38 AM
UTC 2025-11-13T06:03:38.000Z
Space Weather Message Code: SUMPC0Serial Number: 38Issue Time: 2025 Nov 13 0603 UTCSUMMARY: Proton Event 100MeV Integral Flux exceeded 1pfuBegin Time: 2025 Nov 11 1100 UTCMaximum Time: 2025 Nov 12 0150 UTCEnd Time: 2025 Nov 12 0925 UTCMaximum 100MeV Flux: 37 pfuNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanation
Local 11/13/2025, 6:00:50 AM
UTC 2025-11-13T06:00:50.703Z
Space Weather Message Code: SUMPX2Serial Number: 58Issue Time: 2025 Nov 13 0600 UTCSUMMARY: Proton Event 10MeV Integral Flux exceeded 100pfuBegin Time: 2025 Nov 11 1225 UTCMaximum Time: 2025 Nov 12 0215 UTCEnd Time: 2025 Nov 13 0205 UTCMaximum 10MeV Flux: 1460 pfuNOAA Scale: S3 - StrongNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanation
Local 11/13/2025, 5:23:15 AM
UTC 2025-11-13T05:23:15.500Z
Space Weather Message Code: ALTK07Serial Number: 199Issue Time: 2025 Nov 13 0523 UTCALERT: Geomagnetic K-index of 7Threshold Reached: 2025 Nov 13 0518 UTCSynoptic Period: 0300-0600 UTCActive Warning: YesNOAA Scale: G3 - StrongNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.Radio - HF (high frequency) radio may be intermittent.Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
Local 11/13/2025, 4:07:33 AM
UTC 2025-11-13T04:07:33.287Z
Space Weather Message Code: ALTK06Serial Number: 675Issue Time: 2025 Nov 13 0407 UTCALERT: Geomagnetic K-index of 6Threshold Reached: 2025 Nov 13 0404 UTCSynoptic Period: 0300-0600 UTCActive Warning: YesNOAA Scale: G2 - ModerateNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 11/13/2025, 3:35:31 AM
UTC 2025-11-13T03:35:31.170Z
Space Weather Message Code: ALTK05Serial Number: 1912Issue Time: 2025 Nov 13 0335 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2025 Nov 13 0330 UTCSynoptic Period: 0300-0600 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 11/13/2025, 1:53:05 AM
UTC 2025-11-13T01:53:05.330Z
Space Weather Message Code: ALTK07Serial Number: 198Issue Time: 2025 Nov 13 0153 UTCALERT: Geomagnetic K-index of 7Threshold Reached: 2025 Nov 13 0150 UTCSynoptic Period: 0000-0300 UTCActive Warning: YesNOAA Scale: G3 - StrongNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.Radio - HF (high frequency) radio may be intermittent.Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
Local 11/13/2025, 1:21:04 AM
UTC 2025-11-13T01:21:04.183Z
Space Weather Message Code: ALTK06Serial Number: 674Issue Time: 2025 Nov 13 0121 UTCALERT: Geomagnetic K-index of 6Threshold Reached: 2025 Nov 13 0116 UTCSynoptic Period: 0000-0300 UTCActive Warning: YesNOAA Scale: G2 - ModerateNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 11/13/2025, 12:30:31 AM
UTC 2025-11-13T00:30:31.450Z
Space Weather Message Code: ALTK05Serial Number: 1911Issue Time: 2025 Nov 13 0030 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2025 Nov 13 0025 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 11/13/2025, 12:03:59 AM
UTC 2025-11-13T00:03:59.760Z
Space Weather Message Code: ALTK05Serial Number: 1910Issue Time: 2025 Nov 13 0003 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2025 Nov 12 2359 UTCSynoptic Period: 2100-0000 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 11/12/2025, 11:56:47 PM
UTC 2025-11-12T23:56:47.850Z
Space Weather Message Code: WARPX1Serial Number: 614Issue Time: 2025 Nov 12 2356 UTCEXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expectedExtension to Serial Number: 613Valid From: 2025 Nov 10 1030 UTCNow Valid Until: 2025 Nov 13 1200 UTCWarning Condition: PersistencePredicted NOAA Scale: S1 - MinorNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.
Local 11/12/2025, 11:54:59 PM
UTC 2025-11-12T23:54:59.013Z
Space Weather Message Code: WARPC0Serial Number: 120Issue Time: 2025 Nov 12 2354 UTCEXTENDED WARNING: Proton 100MeV Integral Flux above 1pfu expectedExtension to Serial Number: 119Valid From: 2025 Nov 11 1028 UTCNow Valid Until: 2025 Nov 13 0600 UTCWarning Condition: PersistenceNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential Impacts: An enhancement in the energetic portion of the solar radiation spectrum may indicate increased biological risk to astronauts or passengers and crew in high latitude, high altitude flights. Additionally, energetic particles may represent an increased risk to all satellite systems susceptible to single event effects. This information should be used in conjunction with the current Solar Radiation Storm conditions when assessing overall impact.
Local 11/12/2025, 11:38:11 PM
UTC 2025-11-12T23:38:11.443Z
Space Weather Message Code: SUMPX3Serial Number: 21Issue Time: 2025 Nov 12 2338 UTCSUMMARY: Proton Event 10MeV Integral Flux exceeded 1000pfuBegin Time: 2025 Nov 12 0145 UTCMaximum Time: 2025 Nov 12 0215 UTCEnd Time: 2025 Nov 12 0310 UTCMaximum 10MeV Flux: 1460 pfuNOAA Scale: S3 - StrongComment: Final CME shock appears to have arrived at L1 at approximately 12/1853 UTC. The corresponding proton enhancement in GEO reached 819 pfu at 12/1915 UTC. S3 levels are no longer expected.WCNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanation
Local 11/12/2025, 8:54:56 PM
UTC 2025-11-12T20:54:56.067Z
Space Weather Message Code: WARK06Serial Number: 623Issue Time: 2025 Nov 12 2054 UTCEXTENDED WARNING: Geomagnetic K-Index of 6 expectedExtension to Serial Number: 622Valid From: 2025 Nov 11 2344 UTCNow Valid Until: 2025 Nov 13 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 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.
Local 11/12/2025, 8:54:56 PM
UTC 2025-11-12T20:54:56.050Z
Space Weather Message Code: WARK07Serial Number: 138Issue Time: 2025 Nov 12 2054 UTCEXTENDED WARNING: Geomagnetic K-index of 7 or greater expectedExtension to Serial Number: 137Valid From: 2025 Nov 12 0020 UTCNow Valid Until: 2025 Nov 13 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 50 degrees Geomagnetic Latitude.Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.Radio - HF (high frequency) radio may be intermittent.Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
Local 11/12/2025, 8:52:16 PM
UTC 2025-11-12T20:52:16.070Z
Space Weather Message Code: ALTK06Serial Number: 673Issue Time: 2025 Nov 12 2052 UTCALERT: Geomagnetic K-index of 6Threshold Reached: 2025 Nov 12 2051 UTCSynoptic Period: 1800-2100 UTCActive Warning: YesNOAA Scale: G2 - ModerateNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 11/12/2025, 8:11:34 PM
UTC 2025-11-12T20:11:34.170Z
Space Weather Message Code: ALTK05Serial Number: 1909Issue Time: 2025 Nov 12 2011 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2025 Nov 12 2009 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 11/12/2025, 7:38:09 PM
UTC 2025-11-12T19:38:09.800Z
Space Weather Message Code: SUMSUDSerial Number: 291Issue Time: 2025 Nov 12 1938 UTCSUMMARY: Geomagnetic Sudden ImpulseObserved: 2025 Nov 12 1917 UTCDeviation: 33 nTStation: FRDNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanation
Local 11/12/2025, 7:04:28 PM
UTC 2025-11-12T19:04:28.687Z
Space Weather Message Code: WARSUDSerial Number: 247Issue Time: 2025 Nov 12 1904 UTCWARNING: Geomagnetic Sudden Impulse expectedValid From: 2025 Nov 12 1915 UTCValid To: 2025 Nov 12 1945 UTCIP Shock Passage Observed: 2025 Nov 12 1853 UTCNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanation
Local 11/12/2025, 6:05:02 PM
UTC 2025-11-12T18:05:02.097Z
Space Weather Message Code: WATA99Serial Number: 12Issue Time: 2025 Nov 12 1805 UTCWATCH: Geomagnetic Storm Category G4 or Greater PredictedHighest Storm Level Predicted by Day:Nov 13: G4 (Severe) Nov 14: G1 (Minor) Nov 15: None (Below G1)THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECTNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential Impacts: Area of impact primarily poleward of 45 degrees Geomagnetic Latitude.Induced Currents - Possible widespread voltage control problems and some protective systems may mistakenly trip out key assets from the power grid. Induced pipeline currents intensify.Spacecraft - Systems may experience surface charging; increased drag on low earth orbit satellites, and tracking and orientation problems may occur.Navigation - Satellite navigation (GPS) degraded or inoperable for hours.Radio - HF (high frequency) radio propagation sporadic or blacked out.Aurora - Aurora may be seen as low as Alabama and northern California.
Local 11/12/2025, 5:36:40 PM
UTC 2025-11-12T17:36:40.003Z
Space Weather Message Code: ALTK05Serial Number: 1908Issue Time: 2025 Nov 12 1736 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2025 Nov 12 1719 UTCSynoptic Period: 1500-1800 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 11/12/2025, 12:51:03 PM
UTC 2025-11-12T12:51:03.580Z
Space Weather Message Code: ALTK05Serial Number: 1907Issue Time: 2025 Nov 12 1251 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2025 Nov 12 1240 UTCSynoptic Period: 1200-1500 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 11/12/2025, 11:51:12 AM
UTC 2025-11-12T11:51:12.710Z
Space Weather Message Code: WARPC0Serial Number: 119Issue Time: 2025 Nov 12 1151 UTCEXTENDED WARNING: Proton 100MeV Integral Flux above 1pfu expectedExtension to Serial Number: 118Valid From: 2025 Nov 11 1028 UTCNow Valid Until: 2025 Nov 12 2359 UTCWarning Condition: PersistenceNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential Impacts: An enhancement in the energetic portion of the solar radiation spectrum may indicate increased biological risk to astronauts or passengers and crew in high latitude, high altitude flights. Additionally, energetic particles may represent an increased risk to all satellite systems susceptible to single event effects. This information should be used in conjunction with the current Solar Radiation Storm conditions when assessing overall impact.
Local 11/12/2025, 10:38:02 AM
UTC 2025-11-12T10:38:02.563Z
Space Weather Message Code: ALTK07Serial Number: 197Issue Time: 2025 Nov 12 1038 UTCALERT: Geomagnetic K-index of 7Threshold Reached: 2025 Nov 12 1033 UTCSynoptic Period: 0900-1200 UTCActive Warning: YesNOAA Scale: G3 - StrongNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.Radio - HF (high frequency) radio may be intermittent.Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
Local 11/12/2025, 9:35:36 AM
UTC 2025-11-12T09:35:36.900Z
Space Weather Message Code: ALTK06Serial Number: 672Issue Time: 2025 Nov 12 0935 UTCALERT: Geomagnetic K-index of 6Threshold Reached: 2025 Nov 12 0931 UTCSynoptic Period: 0900-1200 UTCActive Warning: YesNOAA Scale: G2 - ModerateNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 11/12/2025, 9:19:21 AM
UTC 2025-11-12T09:19:21.560Z
Space Weather Message Code: ALTK05Serial Number: 1906Issue Time: 2025 Nov 12 0919 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2025 Nov 12 0912 UTCSynoptic Period: 0900-1200 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 11/12/2025, 8:59:18 AM
UTC 2025-11-12T08:59:18.233Z
Space Weather Message Code: ALTK07Serial Number: 196Issue Time: 2025 Nov 12 0859 UTCALERT: Geomagnetic K-index of 7Threshold Reached: 2025 Nov 12 0859 UTCSynoptic Period: 0600-0900 UTCActive Warning: YesNOAA Scale: G3 - StrongNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.Radio - HF (high frequency) radio may be intermittent.Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
Local 11/12/2025, 8:37:13 AM
UTC 2025-11-12T08:37:13.930Z
Space Weather Message Code: WARK07Serial Number: 137Issue Time: 2025 Nov 12 0837 UTCEXTENDED WARNING: Geomagnetic K-index of 7 or greater expectedExtension to Serial Number: 136Valid From: 2025 Nov 12 0020 UTCNow Valid Until: 2025 Nov 12 2100 UTCWarning Condition: PersistenceNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.Radio - HF (high frequency) radio may be intermittent.Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
Local 11/12/2025, 8:37:13 AM
UTC 2025-11-12T08:37:13.913Z
Space Weather Message Code: WARK06Serial Number: 622Issue Time: 2025 Nov 12 0837 UTCEXTENDED WARNING: Geomagnetic K-Index of 6 expectedExtension to Serial Number: 621Valid From: 2025 Nov 11 2344 UTCNow Valid Until: 2025 Nov 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 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.
Local 11/12/2025, 8:37:13 AM
UTC 2025-11-12T08:37:13.913Z
Space Weather Message Code: WARK05Serial Number: 2136Issue Time: 2025 Nov 12 0837 UTCEXTENDED WARNING: Geomagnetic K-index of 5 expectedExtension to Serial Number: 2135Valid From: 2025 Nov 11 2343 UTCNow Valid Until: 2025 Nov 13 1200 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.
Local 11/12/2025, 8:37:13 AM
UTC 2025-11-12T08:37:13.900Z
Space Weather Message Code: ALTK06Serial Number: 671Issue Time: 2025 Nov 12 0837 UTCALERT: Geomagnetic K-index of 6Threshold Reached: 2025 Nov 12 0831 UTCSynoptic Period: 0600-0900 UTCActive Warning: YesNOAA Scale: G2 - ModerateNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 11/12/2025, 8:37:13 AM
UTC 2025-11-12T08:37:13.883Z
Space Weather Message Code: WARK04Serial Number: 5148Issue Time: 2025 Nov 12 0837 UTCEXTENDED WARNING: Geomagnetic K-index of 4 expectedExtension to Serial Number: 5147Valid From: 2025 Nov 11 2230 UTCNow Valid Until: 2025 Nov 13 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 11/12/2025, 6:59:52 AM
UTC 2025-11-12T06:59:52.157Z
Space Weather Message Code: ALTK05Serial Number: 1905Issue Time: 2025 Nov 12 0659 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2025 Nov 12 0655 UTCSynoptic Period: 0600-0900 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 11/12/2025, 5:02:31 AM
UTC 2025-11-12T05:02:31.530Z
Space Weather Message Code: ALTEF3Serial Number: 3559Issue Time: 2025 Nov 12 0502 UTCCONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfuContinuation of Serial Number: 3558Begin Time: 2025 Nov 10 1325 UTCYesterday Maximum 2MeV Flux: 10891 pfuPotential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Local 11/12/2025, 3:46:44 AM
UTC 2025-11-12T03:46:44.953Z
Space Weather Message Code: ALTK08Serial Number: 54Issue Time: 2025 Nov 12 0346 UTCALERT: Geomagnetic K-index of 8, 9-Threshold Reached: 2025 Nov 12 0345 UTCSynoptic Period: 0300-0600 UTCActive Warning: YesNOAA Scale: G4 - SevereNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential Impacts: Area of impact primarily poleward of 45 degrees Geomagnetic Latitude.Induced Currents - Possible widespread voltage control problems and some protective systems may mistakenly trip out key assets from the power grid. Induced pipeline currents intensify.Spacecraft - Systems may experience surface charging; increased drag on low earth orbit satellites, and tracking and orientation problems may occur.Navigation - Satellite navigation (GPS) degraded or inoperable for hours.Radio - HF (high frequency) radio propagation sporadic or blacked out.Aurora - Aurora may be seen as low as Alabama and northern California.
Local 11/12/2025, 3:14:49 AM
UTC 2025-11-12T03:14:49.547Z
Space Weather Message Code: ALTK07Serial Number: 195Issue Time: 2025 Nov 12 0314 UTCALERT: Geomagnetic K-index of 7Threshold Reached: 2025 Nov 12 0310 UTCSynoptic Period: 0300-0600 UTCActive Warning: YesNOAA Scale: G3 - StrongNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.Radio - HF (high frequency) radio may be intermittent.Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
Local 11/12/2025, 3:11:00 AM
UTC 2025-11-12T03:11:00.520Z
Space Weather Message Code: ALTK06Serial Number: 670Issue Time: 2025 Nov 12 0311 UTCALERT: Geomagnetic K-index of 6Threshold Reached: 2025 Nov 12 0306 UTCSynoptic Period: 0300-0600 UTCActive Warning: YesNOAA Scale: G2 - ModerateNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 11/12/2025, 3:10:02 AM
UTC 2025-11-12T03:10:02.003Z
Space Weather Message Code: ALTK05Serial Number: 1904Issue Time: 2025 Nov 12 0310 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2025 Nov 12 0305 UTCSynoptic Period: 0300-0600 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 11/12/2025, 1:55:37 AM
UTC 2025-11-12T01:55:37.727Z
Space Weather Message Code: ALTPX3Serial Number: 33Issue Time: 2025 Nov 12 0155 UTCALERT: Proton Event 10MeV Integral Flux exceeded 1000pfuBegin Time: 2025 Nov 12 0145 UTCNOAA Scale: S3 - StrongNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential Impacts: Radiation - Passengers and crew in high latitude, high altitude flights may experience increasing radiation exposures. Astronauts on EVA (extra-vehicular activity) are exposed to elevated radiation levels.Spacecraft - Single-event upsets to satellite operations, noise in imaging systems, and slight reduction of efficiency in solar panels are likely.Radio - Degraded or episodically blacked-out polar HF (high frequency) radio propagation.
Local 11/12/2025, 1:22:23 AM
UTC 2025-11-12T01:22:23.167Z
Space Weather Message Code: ALTK08Serial Number: 53Issue Time: 2025 Nov 12 0122 UTCALERT: Geomagnetic K-index of 8, 9-Threshold Reached: 2025 Nov 12 0121 UTCSynoptic Period: 0000-0300 UTCActive Warning: YesNOAA Scale: G4 - SevereNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential Impacts: Area of impact primarily poleward of 45 degrees Geomagnetic Latitude.Induced Currents - Possible widespread voltage control problems and some protective systems may mistakenly trip out key assets from the power grid. Induced pipeline currents intensify.Spacecraft - Systems may experience surface charging; increased drag on low earth orbit satellites, and tracking and orientation problems may occur.Navigation - Satellite navigation (GPS) degraded or inoperable for hours.Radio - HF (high frequency) radio propagation sporadic or blacked out.Aurora - Aurora may be seen as low as Alabama and northern California.
Local 11/12/2025, 12:45:44 AM
UTC 2025-11-12T00:45:44.630Z
Space Weather Message Code: ALTK07Serial Number: 194Issue Time: 2025 Nov 12 0045 UTCALERT: Geomagnetic K-index of 7Threshold Reached: 2025 Nov 12 0040 UTCSynoptic Period: 0000-0300 UTCActive Warning: YesNOAA Scale: G3 - StrongNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.Radio - HF (high frequency) radio may be intermittent.Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
Local 11/12/2025, 12:30:30 AM
UTC 2025-11-12T00:30:30.400Z
Space Weather Message Code: ALTK06Serial Number: 669Issue Time: 2025 Nov 12 0030 UTCALERT: Geomagnetic K-index of 6Threshold Reached: 2025 Nov 12 0024 UTCSynoptic Period: 0000-0300 UTCActive Warning: YesNOAA Scale: G2 - ModerateNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 11/12/2025, 12:21:02 AM
UTC 2025-11-12T00:21:02.673Z
Space Weather Message Code: ALTK05Serial Number: 1903Issue Time: 2025 Nov 12 0021 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2025 Nov 12 0012 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 11/12/2025, 12:20:18 AM
UTC 2025-11-12T00:20:18.657Z
Space Weather Message Code: WARK07Serial Number: 136Issue Time: 2025 Nov 12 0020 UTCWARNING: Geomagnetic K-index of 7 or greater expectedValid From: 2025 Nov 12 0020 UTCValid To: 2025 Nov 12 0900 UTCWarning Condition: OnsetNOAA Scale: G3 or greaterNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.Radio - HF (high frequency) radio may be intermittent.Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
Local 11/12/2025, 12:19:36 AM
UTC 2025-11-12T00:19:36.123Z
Space Weather Message Code: ALTK04Serial Number: 2607Issue Time: 2025 Nov 12 0019 UTCALERT: Geomagnetic K-index of 4Threshold Reached: 2025 Nov 12 0011 UTCSynoptic Period: 0000-0300 UTCActive Warning: YesNOAA 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 11/11/2025, 11:45:24 PM
UTC 2025-11-11T23:45:24.107Z
Space Weather Message Code: WARK06Serial Number: 621Issue Time: 2025 Nov 11 2345 UTCWARNING: Geomagnetic K-Index of 6 expectedValid From: 2025 Nov 11 2344 UTCValid To: 2025 Nov 12 1200 UTCWarning Condition: OnsetNOAA Scale: G2 - ModerateNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 11/11/2025, 11:45:16 PM
UTC 2025-11-11T23:45:16.200Z
Space Weather Message Code: WARK05Serial Number: 2135Issue Time: 2025 Nov 11 2345 UTCWARNING: Geomagnetic K-index of 5 expectedValid From: 2025 Nov 11 2343 UTCValid To: 2025 Nov 12 2359 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 11/11/2025, 11:38:06 PM
UTC 2025-11-11T23:38:06.613Z
Space Weather Message Code: WARPC0Serial Number: 118Issue Time: 2025 Nov 11 2338 UTCEXTENDED WARNING: Proton 100MeV Integral Flux above 1pfu expectedExtension to Serial Number: 117Valid From: 2025 Nov 11 1028 UTCNow Valid Until: 2025 Nov 12 1200 UTCWarning Condition: OnsetNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential Impacts: An enhancement in the energetic portion of the solar radiation spectrum may indicate increased biological risk to astronauts or passengers and crew in high latitude, high altitude flights. Additionally, energetic particles may represent an increased risk to all satellite systems susceptible to single event effects. This information should be used in conjunction with the current Solar Radiation Storm conditions when assessing overall impact.
Local 11/11/2025, 11:38:06 PM
UTC 2025-11-11T23:38:06.583Z
Space Weather Message Code: WARPX1Serial Number: 613Issue Time: 2025 Nov 11 2338 UTCEXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expectedExtension to Serial Number: 612Valid From: 2025 Nov 10 1030 UTCNow Valid Until: 2025 Nov 12 2359 UTCWarning Condition: PersistencePredicted NOAA Scale: S2 - ModerateNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.
Local 11/11/2025, 11:16:22 PM
UTC 2025-11-11T23:16:22.520Z
Space Weather Message Code: SUMSUDSerial Number: 290Issue Time: 2025 Nov 11 2316 UTCSUMMARY: Geomagnetic Sudden ImpulseObserved: 2025 Nov 11 2300 UTCDeviation: 17 nTStation: BOUComment: Deviation of 17 nT observed at the Boulder magnetometer at 11/2300 UTC. This is likely the result of the first of three expected CME arrivals anticipated over approximately the next 17 to 18 hours.NOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanation
Local 11/11/2025, 10:28:32 PM
UTC 2025-11-11T22:28:32.703Z
Space Weather Message Code: WARK04Serial Number: 5147Issue Time: 2025 Nov 11 2228 UTCWARNING: Geomagnetic K-index of 4 expectedValid From: 2025 Nov 11 2230 UTCValid To: 2025 Nov 12 2359 UTCWarning Condition: OnsetNOAA 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 11/11/2025, 10:28:08 PM
UTC 2025-11-11T22:28:08.013Z
Space Weather Message Code: WARSUDSerial Number: 246Issue Time: 2025 Nov 11 2228 UTCWARNING: Geomagnetic Sudden Impulse expectedValid From: 2025 Nov 11 2255 UTCValid To: 2025 Nov 11 2340 UTCIP Shock Passage Observed: 2025 Nov 11 2212 UTCNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanation