Pornic

:Product: 3-Day Forecast :Issued: 2025 Mar 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 2 (below NOAA Scale levels). The greatest expected 3 hr Kp for Mar 21-Mar 23 2025 is 3.67 (below NOAA Scale levels). NOAA Kp index breakdown Mar 21-Mar 23 2025 Mar 21 Mar 22 Mar 23 00-03UT 1.67 2.00 3.67 03-06UT 1.33 2.00 3.33 06-09UT 1.33 2.33 2.67 09-12UT 1.33 2.67 2.67 12-15UT 1.33 2.00 2.00 15-18UT 1.33 2.67 2.00 18-21UT 1.67 3.33 2.33 21-00UT 1.67 3.67 2.67 Rationale: No G1 (Minor) or greater geomagnetic storms are expected. 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 21-Mar 23 2025 Mar 21 Mar 22 Mar 23 S1 or greater 5% 5% 5% 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 No radio blackouts were observed over the past 24 hours. Radio Blackout Forecast for Mar 21-Mar 23 2025 Mar 21 Mar 22 Mar 23 R1-R2 30% 30% 30% R3 or greater 5% 5% 5% Rationale: There exists a chance for R1-R2 (Minor-Moderate) radio blackouts over 21-23 Mar.