:Product: 3-Day Forecast :Issued: 2026 Oct 24 1230 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 Oct 24-Oct 26 2026 is 3.67 (below NOAA Scale levels). NOAA Kp index breakdown Oct 24-Oct 26 2026 Oct 24 Oct 25 Oct 26 00-03UT 2.00 3.00 2.33 03-06UT 1.33 3.33 2.00 06-09UT 0.67 3.67 2.00 09-12UT 2.00 3.33 2.00 12-15UT 1.00 3.67 2.00 15-18UT 0.67 3.00 2.00 18-21UT 1.33 3.33 2.00 21-00UT 1.33 3.00 2.33 Rationale: No G1 (Minor) or greater geomagnetic storms are expected. Active levels are expected on 25 Oct due to the possible glancing effects of the CME that left the Sun on 21 Oct combined with an anticipated impact of a high speed stream from a negative polarity coronal hole that is expected to become geoeffective. 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 Oct 24-Oct 26 2026 Oct 24 Oct 25 Oct 26 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 Oct 24-Oct 26 2026 Oct 24 Oct 25 Oct 26 R1-R2 10% 10% 10% R3 or greater 1% 1% 1% Rationale: There is a slight chance for R1-R2 (Minor-Moderate) radio blackouts through 26 Oct.