MSGID: 1:18/200@fidonet 66952473
PID: MBSE-FIDO 1.1.6 (Linux-x86_64)
CHRS: CP437 2
TZUTC: -0500
TID: MBSE-FIDO 1.1.6 (Linux-x86_64)
   :Product: 3-Day Forecast :Issued: 2025 Dec 13 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 Dec 13-Dec 15 2025 is 4.67 (NOAA Scale G1). NOAA Kp index
   breakdown Dec 13-Dec 15 2025 Dec 13 Dec 14 Dec 15 00-03UT 4.33 3.67 2.33
   03-06UT 4.33 3.00 2.00 06-09UT 4.67 (G1) 2.67 2.00 09-12UT 3.67 2.67 2.00
   12-15UT 2.67 2.67 2.00 15-18UT 2.67 2.00 2.00 18-21UT 3.33 2.00 2.00
   21-00UT 3.67 2.67 2.33 Rationale: G1 (Minor) geomagnetic storm levels are
   expected on 13 Dec due to ongoing CH HSS influence. 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 13-Dec 15 2025 Dec 13
   Dec 14 Dec 15 S1 or greater 5% 5% 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 Dec 12 2025 0505 UTC.
   Radio Blackout Forecast for Dec 13-Dec 15 2025 Dec 13 Dec 14 Dec 15 R1-R2
   55% 45% 35% R3 or greater 5% 1% 1% Rationale: R1-R2 (Minor-Moderate) radio
   blackouts are likely on 13 Dec due to the potential of Region 4296 and
   4294 near the W limb.


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