Subj : 3 Day Space Weather Forecast
To   : All
From : Sean Dennis
Date : Sun Apr 05 2026 12:19 am

:Product: 3-Day Forecast
:Issued: 2026 Apr 05 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 5 (NOAA Scale
G1).
The greatest expected 3 hr Kp for Apr 05-Apr 07 2026 is 3.67 (below NOAA
Scale levels).

NOAA Kp index breakdown Apr 05-Apr 07 2026

             Apr 05       Apr 06       Apr 07
00-03UT       3.67         2.67         2.67     
03-06UT       3.33         3.00         2.67     
06-09UT       3.00         2.67         2.67     
09-12UT       3.00         2.67         2.00     
12-15UT       2.67         2.00         0.67     
15-18UT       2.00         1.67         0.67     
18-21UT       2.00         1.67         1.67     
21-00UT       2.67         2.67         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 Apr 05-Apr 07 2026

              Apr 05  Apr 06  Apr 07
S1 or greater   20%     20%     20%

Rationale: There is a slight chance for the greater than 10 MeV proton
flux to exceed S1 (Minor) solar radiation storm levels over 05-07 Apr.

C. NOAA Radio Blackout Activity and Forecast

Radio blackouts reaching the R2 levels were observed over the past 24
hours. The largest was at Apr 04 2026 0117 UTC.

Radio Blackout Forecast for Apr 05-Apr 07 2026

              Apr 05        Apr 06        Apr 07
R1-R2           55%           55%           55%
R3 or greater   20%           20%           20%

Rationale: R1-R2 (Minor-Moderate) radio blackouts are likely, with a
slight chance for an isolated R3 (Strong) event, over 05-07 Apr, driven
primarily by the flare potential of Region 4409.


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