Subj : 3 Day Space Weather Forecast
To   : All
From : Sean Dennis
Date : Fri Dec 19 2025 00:19:02

   :Product: 3-Day Forecast :Issued: 2025 Dec 19 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 19-Dec 21 2025 is 3.00 (below NOAA Scale levels).
   NOAA Kp index breakdown Dec 19-Dec 21 2025 Dec 19 Dec 20 Dec 21 00-03UT
   3.00 2.67 1.67 03-06UT 3.00 2.67 1.33 06-09UT 2.67 2.33 1.33 09-12UT 2.00
   1.67 1.33 12-15UT 1.67 1.67 1.67 15-18UT 1.33 1.33 1.33 18-21UT 1.33 2.00
   1.67 21-00UT 2.67 2.00 1.33 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 19-Dec 21 2025 Dec 19 Dec 20 Dec 21 S1 or
   greater 1% 1% 1% Rationale: No S1 (Minor) or greater solar radiation
   storms are expected. No significant active region activity favorable for
   radiation storm production is forecast. C. NOAA Radio Blackout Activity
   and Forecast No radio blackouts were observed over the past 24 hours.
   Radio Blackout Forecast for Dec 19-Dec 21 2025 Dec 19 Dec 20 Dec 21 R1-R2
   15% 15% 15% R3 or greater 1% 1% 1% Rationale: There is a slight chance for
   R1-R2 (Minor-Moderate) radio blackouts through 20 Dec.


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