:Product: Geomagnetic Forecast :Issued: 2026 Sep 05 2205 UTC # Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center # NOAA Ap Index Forecast Observed Ap 04 Sep 004 Estimated Ap 05 Sep 008 Predicted Ap 06 Sep-08 Sep 005-015-010 NOAA Geomagnetic Activity Probabilities 06 Sep-08 Sep Active 15/40/25 Minor storm 01/25/10 Moderate storm 01/05/01 Strong-Extreme storm 01/01/01 NOAA Kp index forecast 06 Sep - 08 Sep Sep 06 Sep 07 Sep 08 00-03UT 1.67 3.33 2.33 03-06UT 1.67 2.00 2.67 06-09UT 1.33 2.00 2.33 09-12UT 1.33 3.00 2.33 12-15UT 1.33 3.67 2.33 15-18UT 1.33 3.33 2.33 18-21UT 1.33 3.33 2.67 21-00UT 1.67 3.00 2.00