Subj : 3 Day Space Weather Forecast
To   : All
From : Sean Dennis
Date : Tue Nov 25 2025 00:19:01

:Product: 3-Day Forecast
:Issued: 2025 Nov 25 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 4 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Nov 25-Nov 27 2025 is 5.00 (NOAA Scale
G1).

NOAA Kp index breakdown Nov 25-Nov 27 2025

             Nov 25       Nov 26       Nov 27
00-03UT       4.00         3.67         4.00
03-06UT       3.67         5.00 (G1)    4.00
06-09UT       4.33         3.67         4.00
09-12UT       3.67         2.67         3.67
12-15UT       3.33         4.67 (G1)    3.67
15-18UT       3.33         3.67         3.67
18-21UT       4.00         3.00         3.67
21-00UT       4.67 (G1)    3.67         4.00

Rationale: G1 (Minor) geomagnetic storms are likely on 25-26 Nov due to
CH HSS influences.

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 Nov 25-Nov 27 2025

              Nov 25  Nov 26  Nov 27
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 Nov 25-Nov 27 2025

              Nov 25        Nov 26        Nov 27
R1-R2           15%           15%           15%
R3 or greater    1%            1%            1%

Rationale: There is a slight chance for R1-R2 (Minor-Moderate) radio
blackouts on 25-27 Nov.



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