Subj : 3 Day Space Weather Forecast
To   : All
From : Sean Dennis
Date : Thu Apr 24 2025 12:19 am

:Product: 3-Day Forecast
:Issued: 2025 Apr 24 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 Apr 24-Apr 26 2025 is 4.00 (below NOAA
Scale levels).

NOAA Kp index breakdown Apr 24-Apr 26 2025

             Apr 24       Apr 25       Apr 26
00-03UT       4.00         3.67         2.33
03-06UT       3.33         3.00         2.00
06-09UT       3.33         2.00         2.33
09-12UT       4.00         2.67         2.00
12-15UT       3.00         2.67         2.00
15-18UT       3.00         2.67         2.00
18-21UT       2.33         2.00         2.00
21-00UT       2.67         2.67         2.00

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 24-Apr 26 2025

              Apr 24  Apr 25  Apr 26
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 24-Apr 26 2025

              Apr 24        Apr 25        Apr 26
R1-R2           40%           40%           40%
R3 or greater    1%            1%            1%

Rationale: There is a chance for R1 (Minor) radio blackouts.  No
significant active region flare activity is forecast.



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