Local 12/11/2025, 11:39:54 PM
UTC 2025-12-11T23:39:54.417Z
Space Weather Message Code: WARK04Serial Number: 5181Issue Time: 2025 Dec 11 2339 UTCEXTENDED WARNING: Geomagnetic K-index of 4 expectedExtension to Serial Number: 5180Valid From: 2025 Dec 10 2040 UTCNow Valid Until: 2025 Dec 12 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 12/11/2025, 11:39:54 PM
UTC 2025-12-11T23:39:54.400Z
Space Weather Message Code: WARK05Serial Number: 2153Issue Time: 2025 Dec 11 2339 UTCEXTENDED WARNING: Geomagnetic K-index of 5 expectedExtension to Serial Number: 2152Valid From: 2025 Dec 11 1900 UTCNow Valid Until: 2025 Dec 12 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 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 12/11/2025, 8:59:38 PM
UTC 2025-12-11T20:59:38.797Z
Space Weather Message Code: ALTK05Serial Number: 1927Issue Time: 2025 Dec 11 2059 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2025 Dec 11 1914 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 12/11/2025, 7:19:46 PM
UTC 2025-12-11T19:19:46.047Z
Space Weather Message Code: WARK05Serial Number: 2152Issue Time: 2025 Dec 11 1919 UTCWARNING: Geomagnetic K-index of 5 expectedValid From: 2025 Dec 11 1900 UTCValid To: 2025 Dec 12 0000 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 12/11/2025, 3:39:00 AM
UTC 2025-12-11T03:39:00.627Z
Space Weather Message Code: WARK05Serial Number: 2151Issue Time: 2025 Dec 11 0339 UTCEXTENDED WARNING: Geomagnetic K-index of 5 expectedExtension to Serial Number: 2150Valid From: 2025 Dec 10 2115 UTCNow Valid Until: 2025 Dec 11 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 12/11/2025, 3:37:55 AM
UTC 2025-12-11T03:37:55.463Z
Space Weather Message Code: WARK04Serial Number: 5180Issue Time: 2025 Dec 11 0337 UTCEXTENDED WARNING: Geomagnetic K-index of 4 expectedExtension to Serial Number: 5179Valid From: 2025 Dec 10 2040 UTCNow Valid Until: 2025 Dec 11 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 12/11/2025, 2:55:23 AM
UTC 2025-12-11T02:55:23.297Z
Space Weather Message Code: WARK06Serial Number: 629Issue Time: 2025 Dec 11 0255 UTCEXTENDED WARNING: Geomagnetic K-Index of 6 expectedExtension to Serial Number: 628Valid From: 2025 Dec 10 2200 UTCNow Valid Until: 2025 Dec 11 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 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 12/11/2025, 2:52:48 AM
UTC 2025-12-11T02:52:48.877Z
Space Weather Message Code: ALTK06Serial Number: 679Issue Time: 2025 Dec 11 0252 UTCALERT: Geomagnetic K-index of 6Threshold Reached: 2025 Dec 11 0242 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 12/11/2025, 12:16:10 AM
UTC 2025-12-11T00:16:10.550Z
Space Weather Message Code: SUM10RSerial Number: 895Issue Time: 2025 Dec 11 0016 UTCSUMMARY: 10cm Radio BurstBegin Time: 2025 Dec 10 2206 UTCMaximum Time: 2025 Dec 10 2206 UTCEnd Time: 2025 Dec 10 2208 UTCDuration: 2 minutesPeak Flux: 520 sfuLatest Penticton Noon Flux: 168 sfuComment: This summary contains the corrected peak flux of 520 sfuDescription: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.
Local 12/11/2025, 12:14:08 AM
UTC 2025-12-11T00:14:08.690Z
Space Weather Message Code: SUM10RSerial Number: 894Issue Time: 2025 Dec 11 0014 UTCCANCEL SUMMARY: 10cm Radio BurstCancel Serial Number: 893Original Issue Time: 2025 Dec 10 2226 UTCComment: the total flux was 520 sfu instead of the reported one.Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.
Local 12/10/2025, 10:44:04 PM
UTC 2025-12-10T22:44:04.117Z
Space Weather Message Code: ALTK06Serial Number: 678Issue Time: 2025 Dec 10 2244 UTCALERT: Geomagnetic K-index of 6Threshold Reached: 2025 Dec 10 2243 UTCSynoptic Period: 2100-2400 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 12/10/2025, 10:29:22 PM
UTC 2025-12-10T22:29:22.963Z
Space Weather Message Code: ALTTP2Serial Number: 1455Issue Time: 2025 Dec 10 2229 UTCALERT: Type II Radio EmissionBegin Time: 2025 Dec 10 2208 UTCEstimated Velocity: 849 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 12/10/2025, 10:26:32 PM
UTC 2025-12-10T22:26:32.807Z
Space Weather Message Code: SUM10RSerial Number: 893Issue Time: 2025 Dec 10 2226 UTCSUMMARY: 10cm Radio BurstBegin Time: 2025 Dec 10 2206 UTCMaximum Time: 2025 Dec 10 2206 UTCEnd Time: 2025 Dec 10 2208 UTCDuration: 2 minutesPeak Flux: 2695 sfuLatest Penticton Noon Flux: 168 sfuDescription: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.
Local 12/10/2025, 10:13:22 PM
UTC 2025-12-10T22:13:22.123Z
Space Weather Message Code: ALTK05Serial Number: 1926Issue Time: 2025 Dec 10 2213 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2025 Dec 10 2207 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 12/10/2025, 10:07:24 PM
UTC 2025-12-10T22:07:24.793Z
Space Weather Message Code: WARK05Serial Number: 2150Issue Time: 2025 Dec 10 2207 UTCEXTENDED WARNING: Geomagnetic K-index of 5 expectedExtension to Serial Number: 2149Valid From: 2025 Dec 10 2115 UTCNow Valid Until: 2025 Dec 11 0600 UTCWarning Condition: OnsetNOAA 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 12/10/2025, 10:06:29 PM
UTC 2025-12-10T22:06:29.790Z
Space Weather Message Code: WARK04Serial Number: 5179Issue Time: 2025 Dec 10 2206 UTCEXTENDED WARNING: Geomagnetic K-index of 4 expectedExtension to Serial Number: 5178Valid From: 2025 Dec 10 2040 UTCNow Valid Until: 2025 Dec 11 0900 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 12/10/2025, 9:57:48 PM
UTC 2025-12-10T21:57:48.797Z
Space Weather Message Code: WARK06Serial Number: 628Issue Time: 2025 Dec 10 2157 UTCWARNING: Geomagnetic K-Index of 6 expectedValid From: 2025 Dec 10 2200 UTCValid To: 2025 Dec 11 0300 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 12/10/2025, 9:20:24 PM
UTC 2025-12-10T21:20:24.660Z
Space Weather Message Code: ALTK04Serial Number: 2615Issue Time: 2025 Dec 10 2120 UTCALERT: Geomagnetic K-index of 4Threshold Reached: 2025 Dec 10 2111 UTCSynoptic Period: 2100-2400 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 12/10/2025, 9:17:01 PM
UTC 2025-12-10T21:17:01.720Z
Space Weather Message Code: WARK05Serial Number: 2149Issue Time: 2025 Dec 10 2117 UTCWARNING: Geomagnetic K-index of 5 expectedValid From: 2025 Dec 10 2115 UTCValid To: 2025 Dec 11 0300 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 12/10/2025, 8:40:06 PM
UTC 2025-12-10T20:40:06.707Z
Space Weather Message Code: WARK04Serial Number: 5178Issue Time: 2025 Dec 10 2040 UTCWARNING: Geomagnetic K-index of 4 expectedValid From: 2025 Dec 10 2040 UTCValid To: 2025 Dec 11 0300 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 12/10/2025, 7:08:08 AM
UTC 2025-12-10T07:08:08.410Z
Space Weather Message Code: WARK04Serial Number: 5177Issue Time: 2025 Dec 10 0708 UTCWARNING: Geomagnetic K-index of 4 expectedValid From: 2025 Dec 10 0707 UTCValid To: 2025 Dec 10 1500 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.