roduct: 3-Day Forecast
:Issued: 2026 May 26 0030 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 3 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for May 26-May 28 2026 is 3.67 (below NOAA
Scale levels).

NOAA Kp index breakdown May 26-May 28 2026

             May 26       May 27       May 28
00-03UT       1.67         2.67         3.00     
03-06UT       1.67         3.67         3.67     
06-09UT       2.00         3.00         3.00     
09-12UT       1.67         2.67         2.67     
12-15UT       1.67         2.33         2.00     
15-18UT       1.67         2.00         1.67     
18-21UT       2.00         2.33         2.67     
21-00UT       2.00         2.67         1.67     

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 26-May 28 2026

              May 26  May 27  May 28
S1 or greater   50%      5%      5%

Rationale: There is a chance for S1 (Minor) or greater solar radiation
storms due to activity beyond the NW limb.

C. NOAA Radio Blackout Activity and Forecast

No radio blackouts were observed over the past 24 hours.

Radio Blackout Forecast for May 26-May 28 2026

              May 26        May 27        May 28
R1-R2           35%           35%           35%
R3 or greater    5%            5%            5%

Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts
all three days.


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