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|  Message 13200  |
|  Sean Dennis to All  |
|  3 Day Space Weather Forecast  |
|  07 Dec 25 00:19:03  |
 MSGID: 1:18/200@fidonet 6694f1e4 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 07 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 07-Dec 09 2025 is 5.00 (NOAA Scale G1). NOAA Kp index breakdown Dec 07-Dec 09 2025 Dec 07 Dec 08 Dec 09 00-03UT 2.67 3.00 1.67 03-06UT 2.00 5.00 (G1) 1.67 06-09UT 2.33 3.00 1.67 09-12UT 2.33 3.00 1.33 12-15UT 2.33 3.67 1.33 15-18UT 3.67 2.67 1.33 18-21UT 5.00 (G1) 2.00 1.33 21-00UT 4.00 2.00 1.33 Rationale: Isolated periods of G1 (Minor) geomagnetic storming are likely on 07-08 Dec due to the anticipated glancing arrival of a CME from 04 Dec. 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 07-Dec 09 2025 Dec 07 Dec 08 Dec 09 S1 or greater 10% 10% 10% Rationale: There is a slight chance for S1 (Minor) solar radiation storm conditions on 07-09 Dec. C. NOAA Radio Blackout Activity and Forecast Radio blackouts reaching the R2 levels were observed over the past 24 hours. The largest was at Dec 06 2025 2039 UTC. Radio Blackout Forecast for Dec 07-Dec 09 2025 Dec 07 Dec 08 Dec 09 R1-R2 65% 65% 65% R3 or greater 15% 15% 15% Rationale: R1-R2 (Minor-Moderate) radio blackouts are likely, with a slight chance for R3 (Strong) or greater events, on 07-09 Dec. --- MBSE BBS v1.1.6 (Linux-x86_64) * Origin: Outpost BBS * Johnson City, TN (1:18/200) SEEN-BY: 1/110 18/200 105/81 106/201 128/187 129/14 305 153/7715 154/110 SEEN-BY: 218/700 226/30 227/114 229/110 112 134 200 206 300 307 312 SEEN-BY: 229/317 400 426 428 470 664 700 705 266/512 291/111 292/854 SEEN-BY: 320/219 322/757 342/200 396/45 460/58 633/280 712/848 902/26 SEEN-BY: 5020/400 5075/35 PATH: 18/200 229/426 |
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