Subj : 3 Day Space Weather Forecast
To   : All
From : Sean Dennis
Date : Thu Apr 23 2026 12:19 am

:Product: 3-Day Forecast
:Issued: 2026 Apr 23 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 2 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Apr 23-Apr 25 2026 is 3.00 (below NOAA
Scale levels).

NOAA Kp index breakdown Apr 23-Apr 25 2026

             Apr 23       Apr 24       Apr 25
00-03UT       2.33         2.33         2.33     
03-06UT       2.00         2.67         2.67     
06-09UT       2.00         2.67         2.33     
09-12UT       2.00         1.67         2.00     
12-15UT       0.67         1.33         1.33     
15-18UT       2.00         2.00         1.67     
18-21UT       2.67         2.00         2.00     
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 Apr 23-Apr 25 2026

              Apr 23  Apr 24  Apr 25
S1 or greater    1%      1%      1%

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 Apr 23-Apr 25 2026

              Apr 23        Apr 24        Apr 25
R1-R2           10%           10%           10%
R3 or greater    1%            1%            1%

Rationale: A slight chance for R1-R2 (Minor-Moderate) radio blackouts
will persist through 25 April primarily due to the flare potential
exhibited by Region 4420.


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