:Product: Geomagnetic Forecast
:Issued: 2026 May 17 2205 UTC
# Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center
#
NOAA Ap Index Forecast
Observed Ap 16 May 034
Estimated Ap 17 May 012
Predicted Ap 18 May-20 May 021-021-008

NOAA Geomagnetic Activity Probabilities 18 May-20 May
Active                25/15/25
Minor storm           40/40/10
Moderate storm        20/25/01
Strong-Extreme storm  05/05/01

NOAA Kp index forecast 18 May - 20 May
             May 18    May 19    May 20
00-03UT        3.67      4.33      2.33      
03-06UT        3.33      5.33      2.33      
06-09UT        3.00      3.67      2.00      
09-12UT        2.33      2.67      2.00      
12-15UT        2.00      2.00      2.00      
15-18UT        5.00      2.00      2.00      
18-21UT        4.00      3.00      2.00      
21-00UT        3.33      3.33      2.00