:Product: 3-Day Forecast
:Issued: 2026 May 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 1 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for May 24-May 26 2026 is 3.00 (below NOAA
Scale levels).

NOAA Kp index breakdown May 24-May 26 2026

             May 24       May 25       May 26
00-03UT       1.00         1.67         1.33     
03-06UT       1.00         1.33         2.00     
06-09UT       1.33         1.33         2.33     
09-12UT       1.00         1.33         2.00     
12-15UT       1.33         1.67         2.00     
15-18UT       1.33         1.33         2.00     
18-21UT       1.33         1.67         2.00     
21-00UT       1.67         1.33         3.00     

Rationale: No G1 (Minor) or greater geomagnetic storms are expected.  No
significant transient or recurrent solar wind features are forecast.

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 24-May 26 2026

              May 24  May 25  May 26
S1 or greater    5%      5%      5%

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 24-May 26 2026

              May 24        May 25        May 26
R1-R2           35%           35%           35%
R3 or greater    5%            5%            5%

Rationale: There exists a chance for R1-R2 (Minor-Moderate) radio
blackouts over 24-26 May.