Subj : 3 Day Space Weather Forecast
To   : All
From : Sean Dennis
Date : Thu Oct 23 2025 12:19 am

:Product: 3-Day Forecast
:Issued: 2025 Oct 23 0034 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 Oct 23-Oct 25 2025 is 2.67 (below NOAA
Scale levels).

NOAA Kp index breakdown Oct 23-Oct 25 2025

             Oct 23       Oct 24       Oct 25
00-03UT       2.00         1.67         2.67
03-06UT       1.67         1.33         2.67
06-09UT       1.33         1.33         2.33
09-12UT       1.00         1.33         2.33
12-15UT       1.00         1.33         2.33
15-18UT       1.33         1.33         2.33
18-21UT       1.67         1.67         2.00
21-00UT       1.67         1.67         2.33

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 Oct 23-Oct 25 2025

              Oct 23  Oct 24  Oct 25
S1 or greater   10%      1%      1%

Rationale: There is a slight chance for S1 (Minor) solar radiation storm
levels to be reached on 23 Oct associated with far-sided events. Chances
diminish by 24-25 Oct.

C. NOAA Radio Blackout Activity and Forecast

No radio blackouts were observed over the past 24 hours.

Radio Blackout Forecast for Oct 23-Oct 25 2025

              Oct 23        Oct 24        Oct 25
R1-R2           15%           15%           15%
R3 or greater    1%            1%            1%

Rationale: There is a slight chance for isolated R1-R2 (Minor-Moderate)
radio blackouts through 25 Oct.



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