MSGID: 1:18/200@fidonet 6690ce84   
   PID: MBSE-FIDO 1.1.1 (Linux-x86_64)   
   CHRS: CP437 2   
   TZUTC: -0400   
   TID: MBSE-FIDO 1.1.1 (Linux-x86_64)   
   :Product: 3-Day Forecast   
   :Issued: 2025 Apr 21 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 5 (NOAA Scale   
   G1).   
   The greatest expected 3 hr Kp for Apr 21-Apr 23 2025 is 6.00 (NOAA Scale   
   G2).   
      
   NOAA Kp index breakdown Apr 21-Apr 23 2025   
      
                Apr 21       Apr 22       Apr 23   
   00-03UT       3.00         3.00         4.00   
   03-06UT       3.67         2.00         5.67 (G2)   
   06-09UT       2.00         3.00         4.33   
   09-12UT       2.00         4.00         4.00   
   12-15UT       2.00         4.33         4.67 (G1)   
   15-18UT       2.00         5.00 (G1)    4.33   
   18-21UT       2.67         5.33 (G1)    3.00   
   21-00UT       3.67         6.00 (G2)    4.67 (G1)   
      
   Rationale: Periods of G1-G2 (Minor-Moderate) geomagnetic storms are   
   likely on 22-23 Apr due to the influences of a positive polarity CH HSS.   
      
   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 Apr 21-Apr 23 2025   
      
                 Apr 21  Apr 22  Apr 23   
   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   
      
   Radio blackouts reaching the R1 levels were observed over the past 24   
   hours. The largest was at Apr 20 2025 1211 UTC.   
      
   Radio Blackout Forecast for Apr 21-Apr 23 2025   
      
                 Apr 21        Apr 22        Apr 23   
   R1-R2           40%           40%           40%   
   R3 or greater    5%            5%            5%   
      
   Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts   
   over 21-23 Apr.   
      
      
      
   --- MBSE BBS v1.1.1 (Linux-x86_64)   
    * Origin: Outpost BBS * Johnson City, TN (1:18/200)   
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