Subj : 3 Day Space Weather Forecast
To   : All
From : Sean Dennis
Date : Sun Dec 07 2025 00:19:03

   :Product: 3-Day Forecast :Issued: 2025 Dec 07 0030 UTC # Prepared by the
   U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center # A. NOAA
   Geomagnetic Activity Observation and Forecast The greatest observed 3 hr
   Kp over the past 24 hours was 4 (below NOAA Scale levels). The greatest
   expected 3 hr Kp for Dec 07-Dec 09 2025 is 5.00 (NOAA Scale G1). NOAA Kp
   index breakdown Dec 07-Dec 09 2025 Dec 07 Dec 08 Dec 09 00-03UT 2.67 3.00
   1.67 03-06UT 2.00 5.00 (G1) 1.67 06-09UT 2.33 3.00 1.67 09-12UT 2.33 3.00
   1.33 12-15UT 2.33 3.67 1.33 15-18UT 3.67 2.67 1.33 18-21UT 5.00 (G1) 2.00
   1.33 21-00UT 4.00 2.00 1.33 Rationale: Isolated periods of G1 (Minor)
   geomagnetic storming are likely on 07-08 Dec due to the anticipated
   glancing arrival of a CME from 04 Dec. B. NOAA Solar Radiation Activity
   Observation and Forecast Solar radiation, as observed by NOAA GOES-18 over
   the past 24 hours, was below S-scale storm level thresholds. Solar
   Radiation Storm Forecast for Dec 07-Dec 09 2025 Dec 07 Dec 08 Dec 09 S1 or
   greater 10% 10% 10% Rationale: There is a slight chance for S1 (Minor)
   solar radiation storm conditions on 07-09 Dec. C. NOAA Radio Blackout
   Activity and Forecast Radio blackouts reaching the R2 levels were observed
   over the past 24 hours. The largest was at Dec 06 2025 2039 UTC. Radio
   Blackout Forecast for Dec 07-Dec 09 2025 Dec 07 Dec 08 Dec 09 R1-R2 65%
   65% 65% R3 or greater 15% 15% 15% Rationale: R1-R2 (Minor-Moderate) radio
   blackouts are likely, with a slight chance for R3 (Strong) or greater
   events, on 07-09 Dec.


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