Subj : 3 Day Space Weather Forecast
To   : All
From : Sean Dennis
Date : Tue Dec 16 2025 00:19:01

   :Product: 3-Day Forecast :Issued: 2025 Dec 16 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 3 (below NOAA Scale levels). The greatest
   expected 3 hr Kp for Dec 16-Dec 18 2025 is 5.00 (NOAA Scale G1). NOAA Kp
   index breakdown Dec 16-Dec 18 2025 Dec 16 Dec 17 Dec 18 00-03UT 1.67 1.67
   5.00 (G1) 03-06UT 3.00 2.00 4.67 (G1) 06-09UT 2.67 2.00 4.00 09-12UT 2.00
   2.00 3.67 12-15UT 2.00 3.00 3.00 15-18UT 1.33 3.33 3.00 18-21UT 0.67 4.00
   2.67 21-00UT 1.67 4.33 3.33 Rationale: G1 (Minor) or greater geomagnetic
   storms are expected on Dec 18 due to the passage of a coronal hole high
   speed stream. 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 16-Dec 18 2025 Dec 16 Dec 17 Dec 18 S1 or greater 1% 1% 1% Rationale:
   No S1 (Minor) or greater solar radiation storms are expected. C. NOAA
   Radio Blackout Activity and Forecast No radio blackouts were observed over
   the past 24 hours. Radio Blackout Forecast for Dec 16-Dec 18 2025 Dec 16
   Dec 17 Dec 18 R1-R2 20% 20% 20% R3 or greater 1% 1% 1% Rationale: No R1
   (Minor) or greater radio blackouts are expected. No significant active
   region flare activity is forecast.


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