Routine Space Environment Product Issued Weekly
Issued by NWS
Issued by NWS
342 FXXX02 KWNP 070256 WEKFOR :Product: 27-day Space Weather Forecast :Issued: 2026 Sep 07 0224 UTC # Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center # Product description and SWPC contact on the Web # https://www.swpc.noaa.gov/content/subscription-services # # 27-day Space Weather Forecast # Forecast of Solar and Geomagnetic Activity 07 September - 03 October 2026 Solar activity is expected to be at low levels, with a chance for moderate levels and a slight chance for high levels throughout the forecast period. No proton events are expected at geosynchronous orbit. The greater than 2 MeV electron flux at geosynchronous orbit is expected to be at high levels on 09-12 Sep, 16-23 Sep, and 27 Sep-03 Oct. Levels are expected to be at normal to moderate levels on 07-08 Sep, 13-15 Sep, and 24-26 Sep. Geomagnetic field activity is expected reach active to G1 storming levels on 07-08 Sep due to the anticipated arrivals of the CMEs discussed above. G1 storming levels are again anticipated on 24-26 Sep due to a recurrent positive polarity coronal hole high speed stream (CH HSS), with active levels anticipated on 27 Sep. Active levels are also anticipated on 14-16 Sep due to a recurrent negative polarity CH HSS. Largely quiet levels are anticipated for all remaining dates in the forecast period.