FXXX10 KWNP 070031 DAYTDF :Product: 3-Day Forecast :Issued: 2026 May 07 0030 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 1 (below NOAA Scale levels). The greatest expected 3 hr Kp for May 07-May 09 2026 is 4.33 (below NOAA Scale levels). NOAA Kp index breakdown May 07-May 09 2026 May 07 May 08 May 09 00-03UT 2.00 3.67 2.67 03-06UT 2.00 4.00 2.33 06-09UT 2.33 3.33 2.33 09-12UT 2.33 3.00 2.33 12-15UT 2.67 2.33 2.33 15-18UT 3.00 2.67 2.00 18-21UT 3.67 3.33 2.33 21-00UT 4.33 3.67 2.67 Rationale: There is a chance for isolated periods of G1-G2 (Minor-Moderate) geomagnetic storming late on 07 May through 08 May due to the onset of +CH HSS influences. B. NOAA Solar Radiation Activity Observation and Forecast Solar radiation, as observed by NOAA GOES-19 over the past 24 hours, was below S-scale storm level thresholds. Solar Radiation Storm Forecast for May 07-May 09 2026 May 07 May 08 May 09 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 May 07-May 09 2026 May 07 May 08 May 09 R1-R2 15% 30% 30% R3 or greater 1% 10% 10% Rationale: There is a slight chance for isolated R1-R2 (Minor-Moderate) radio blackouts on 07 May. Probabilities increase beginning 08 May as up to two active regions near L=330 rotate into view from beyond the eastern limb. Considering the size of these regions and recent far-side eruptions seen in coronagraph imagery, solar activity is expected to increase 08-09 May with a chance for R1-R2 (Minor-Moderate) radio blackouts, and a slight chance for R3 (Strong or greater) events.