####018002008#### FXXX10 KWNP 241231 DAYTDF :Product: 3-Day Forecast :Issued: 2026 Mar 24 1230 UTC # Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center # Product description and SWPC contact on the Web # http://www.swpc.noaa.gov/wwire.html # # 3-Day Forecast # 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 Mar 24-Mar 26 2026 is 3.67 (below NOAA Scale levels). NOAA Kp index breakdown Mar 24-Mar 26 2026 Mar 24 Mar 25 Mar 26 00-03UT 2.67 3.00 3.00 03-06UT 3.67 3.67 2.00 06-09UT 3.33 2.67 2.00 09-12UT 3.67 2.67 2.67 12-15UT 3.00 2.00 2.67 15-18UT 2.33 2.00 3.00 18-21UT 2.67 2.67 3.67 21-00UT 3.67 2.67 3.67 Rationale: No G1 (Minor) or greater geomagnetic storms are expected through 26 Mar. 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 Mar 24-Mar 26 2026 Mar 24 Mar 25 Mar 26 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 Mar 24-Mar 26 2026 Mar 24 Mar 25 Mar 26 R1-R2 25% 25% 25% R3 or greater 5% 5% 5% Rationale: There is a chance for R1-R2 (Minor-Moderate) greater radio blackouts, with a slight chance for R3 (Strong) events, through 26 Mar. ####018002890#### FXXX12 KWNP 241231 DAYDIS :Product: Forecast Discussion :Issued: 2026 Mar 24 1230 UTC # Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center # Product description and SWPC contact on the Web # http://www.swpc.noaa.gov/wwire.html # # Forecast Discussion # Solar Activity .24 hr Summary... Solar activity was at low levels with only a scattering of C1 flares throughout the reporting period, primarily from Regions 4398 (S17W13, Bxi/beta) and 4402 (N17E44, Dao/beta). Region 4401 (N25E38, Dai/beta-gamma) continued to exhibit flux emergence in its intermediary region, resulting in new trailing and intermediary spots. Regions 4398 and 4400 (S13W52, Dao/beta-delta) also exhibited flux emergence, but only 4398 gained new spots, with 4400 actually mildly simplifying. The remaining spot groups were either stable or in decay. No additional Earth directed CMEs were observed in available coronagraph imagery. .Forecast... Solar activity is expected to be low with a chance for M-class flares on 24-26 Mar. Energetic Particle .24 hr Summary... Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 8,285 pfu at 23/1900 UTC. The greater than 10 MeV proton flux was slightly elevated, but well below alert threshold levels. .Forecast... The greater than 2 MeV electron flux is expected to continue to reach high levels through 25 Mar due to post storming effects, before returning to normal levels on 26 Mar. The greater than 10 MeV proton flux is expected to continue near background values. Solar Wind .24 hr Summary... Solar wind parameters reflected diminishing negative polarity CH HSS influences. Solar wind speed slowly decreased throughout the period from ~675 km/s to ~600 km/s. Total IMF (Bt) averaged between 4-6 nT, Bz fluctuated between +/-5 nT, spending most of the period in a southern orientation, and Phi was predominantly in a negative orientation. .Forecast... The solar wind environment is expected to remain enhanced, reflecting slowly diminishing CH HSS influences through 25 Mar. Late on 26 Mar, the 22 Mar CME is anticipated to pass near Earth, possibly inducing additional enhancements in the solar wind environment. Geospace .24 hr Summary... The geomagnetic field reached G1 (Minor) levels under waning CME/CH HSS influences. .Forecast... Isolated periods of G1 (Minor) geomagnetic storming are possible on 24 Mar as negative polarity CH HSS influences persist. Mostly unsettled conditions are expected, with isolated active periods likely, on 25 Mar as negative polarity CH HSS influences continue, but gradually diminish. By late 26 Mar, the aforementioned CME is anticipated to pass near Earth, likely increasing activity to active levels.