Subj : 3 Day Space Weather Forecast
To   : All
From : Sean Dennis
Date : Tue Jul 28 2026 12:19 am

:Product: 3-Day Forecast
:Issued: 2026 Jul 28 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 Jul 28-Jul 30 2026 is 3.67 (below NOAA
Scale levels).

NOAA Kp index breakdown Jul 28-Jul 30 2026

             Jul 28       Jul 29       Jul 30
00-03UT       3.67         2.67         2.00     
03-06UT       3.33         2.00         1.67     
06-09UT       2.00         2.00         2.00     
09-12UT       3.00         2.00         2.00     
12-15UT       3.33         2.00         2.00     
15-18UT       2.00         2.00         2.33     
18-21UT       3.33         2.00         2.67     
21-00UT       3.00         2.33         2.67     

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

Solar Radiation Storm Forecast for Jul 28-Jul 30 2026

              Jul 28  Jul 29  Jul 30
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

Radio blackouts reaching the R1 levels were observed over the past 24
hours. The largest was at Jul 27 2026 0243 UTC.

Radio Blackout Forecast for Jul 28-Jul 30 2026

              Jul 28        Jul 29        Jul 30
R1-R2           40%           40%           40%
R3 or greater   10%           10%           10%

Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts
and a slight chance for R3 (Strong) or greater blackouts on 28-30 Jul.


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