Subj : 3 Day Space Weather Forecast
To   : All
From : Sean Dennis
Date : Wed Dec 10 2025 00:19:01

   :Product: 3-Day Forecast :Issued: 2025 Dec 10 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 2 (below NOAA Scale levels). The greatest
   expected 3 hr Kp for Dec 10-Dec 12 2025 is 3.33 (below NOAA Scale levels).
   NOAA Kp index breakdown Dec 10-Dec 12 2025 Dec 10 Dec 11 Dec 12 00-03UT
   2.00 1.00 3.33 03-06UT 2.00 2.00 2.00 06-09UT 3.00 2.33 2.00 09-12UT 2.00
   2.33 3.00 12-15UT 2.00 2.33 2.67 15-18UT 2.00 2.33 3.00 18-21UT 3.00 2.33
   3.33 21-00UT 1.33 2.67 3.33 Rationale: No G1 (Minor) or greater
   geomagnetic storms are expected. No significant transient or recurrent
   solar wind features are forecast. 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 10-Dec 12 2025 Dec 10 Dec 11 Dec 12 S1 or
   greater 15% 10% 5% Rationale: There is a slight chance for S1 (Minor) or
   greater solar radiation storms on 10-11 Dec. C. NOAA Radio Blackout
   Activity and Forecast Radio blackouts reaching the R1 levels were observed
   over the past 24 hours. The largest was at Dec 09 2025 0058 UTC. Radio
   Blackout Forecast for Dec 10-Dec 12 2025 Dec 10 Dec 11 Dec 12 R1-R2 65%
   65% 65% R3 or greater 15% 15% 10% Rationale: R1-R2 (Minor-Moderate) radio
   blackouts are likely, with a slight chance for R3 (Strong) or greater
   events on 10-12 Dec.


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