===================================== NOAA 3 Day Space Weather Forecast ===================================== The greatest observed 3 hr Kp over the past 24 hours was 3 (below NOAA Scale levels). The greatest expected 3 hr Kp for Mar 26-Mar 28 2023 is 4.67 (NOAA Scale G1). NOAA Kp index breakdown Mar 26-Mar 28 2023 Mar 26 Mar 27 Mar 28 00-03UT 3.00 4.00 2.67 03-06UT 2.67 3.67 2.00 06-09UT 2.00 3.00 2.33 09-12UT 1.00 3.00 2.33 12-15UT 3.00 2.00 2.33 15-18UT 4.67 (G1) 2.00 2.33 18-21UT 3.67 2.67 2.33 21-00UT 3.00 3.00 2.67 Rationale: G1 (Minor) geomagnetic storms are likely on Mar 26 due to CH HSS effects. B. NOAA Solar Radiation Activity Observation and Forecast Solar radiation, as observed by NOAA GOES-16 over the past 24 hours, was below S-scale storm level thresholds. Solar Radiation Storm Forecast for Mar 26-Mar 28 2023 Mar 26 Mar 27 Mar 28 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 No radio blackouts were observed over the past 24 hours. Radio Blackout Forecast for Mar 26-Mar 28 2023 Mar 26 Mar 27 Mar 28 R1-R2 10% 10% 10% R3 or greater 1% 1% 1% Rationale: There is a slight chance for R1-R2 (Minor-Moderate) radio blackouts on Mar 26-28.