:Product: 3-Day Forecast
:Issued: 2026 Jul 25 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 4 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Jul 25-Jul 27 2026 is 3.67 (below NOAA
Scale levels).

NOAA Kp index breakdown Jul 25-Jul 27 2026

             Jul 25       Jul 26       Jul 27
00-03UT       1.67         2.00         3.00     
03-06UT       1.33         1.67         3.00     
06-09UT       1.33         1.33         3.00     
09-12UT       1.33         1.00         3.33     
12-15UT       1.33         1.33         3.00     
15-18UT       1.33         1.33         3.67     
18-21UT       1.67         1.33         3.67     
21-00UT       1.67         1.67         3.33     

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-18 over the past 24 hours, was
below S-scale storm level thresholds.

Solar Radiation Storm Forecast for Jul 25-Jul 27 2026

              Jul 25  Jul 26  Jul 27
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 Jul 25-Jul 27 2026

              Jul 25        Jul 26        Jul 27
R1-R2           35%           35%           35%
R3 or greater    5%            5%            5%

Rationale: Solar activity is expected to be at low levels with a high
chance for M-class flares (35%) on 25-27 July due to the flare potential
of Regions 4493 and 4494.