Space Weather Alerts

Space Weather Message Code: WATA20
Serial Number: 1084
Issue Time: 2025 Dec 29 1542 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Dec 30:  None (Below G1)   Dec 31:  None (Below G1)   Jan 01:  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.

Space Weather Message Code: ALTEF3
Serial Number: 3589
Issue Time: 2025 Dec 29 0806 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3588
Begin Time: 2025 Dec 21 1425 UTC
Yesterday Maximum 2MeV Flux: 8999 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Space Weather Message Code: SUM10R
Serial Number: 897
Issue Time: 2025 Dec 28 2255 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2025 Dec 28 2225 UTC
Maximum Time: 2025 Dec 28 2231 UTC
End Time: 2025 Dec 28 2236 UTC
Duration: 11 minutes
Peak Flux: 300 sfu
Latest Penticton Noon Flux: 188 sfu



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.

Space Weather Message Code: ALTEF3
Serial Number: 3588
Issue Time: 2025 Dec 28 0459 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3587
Begin Time: 2025 Dec 21 1425 UTC
Yesterday Maximum 2MeV Flux: 6123 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Space Weather Message Code: ALTEF3
Serial Number: 3587
Issue Time: 2025 Dec 27 0507 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3586
Begin Time: 2025 Dec 21 1425 UTC
Yesterday Maximum 2MeV Flux: 8195 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Space Weather Message Code: ALTEF3
Serial Number: 3586
Issue Time: 2025 Dec 27 0324 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3585
Begin Time: 2025 Dec 21 1425 UTC
Yesterday Maximum 2MeV Flux: 8195 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Space Weather Message Code: SUMXM5
Serial Number: 302
Issue Time: 2025 Dec 27 0215 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2025 Dec 27 0138 UTC
Maximum Time: 2025 Dec 27 0150 UTC
End Time: 2025 Dec 27 0159 UTC
X-ray Class: M5.1
Location: S09E73
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth.
Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.

Space Weather Message Code: ALTTP2
Serial Number: 1460
Issue Time: 2025 Dec 27 0204 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Dec 27 0147 UTC
Estimated Velocity: 788 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.

Space Weather Message Code: SUM10R
Serial Number: 896
Issue Time: 2025 Dec 27 0156 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2025 Dec 27 0144 UTC
Maximum Time: 2025 Dec 27 0144 UTC
End Time: 2025 Dec 27 0146 UTC
Duration: 2 minutes
Peak Flux: 190 sfu
Latest Penticton Noon Flux: 166 sfu



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.

Space Weather Message Code: ALTXMF
Serial Number: 506
Issue Time: 2025 Dec 27 0150 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2025 Dec 27 0148 UTC
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

Space Weather Message Code: ALTEF3
Serial Number: 3585
Issue Time: 2025 Dec 26 0512 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3584
Begin Time: 2025 Dec 21 1425 UTC
Yesterday Maximum 2MeV Flux: 8651 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Space Weather Message Code: ALTEF3
Serial Number: 3584
Issue Time: 2025 Dec 25 0501 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3583
Begin Time: 2025 Dec 21 1425 UTC
Yesterday Maximum 2MeV Flux: 7351 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.