Subj : 3 Day Space Weather Forecast
To   : All
From : Sean Dennis
Date : Fri Nov 07 2025 00:19:01

:Product: 3-Day Forecast
:Issued: 2025 Nov 07 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 7 (NOAA Scale
G3).
The greatest expected 3 hr Kp for Nov 07-Nov 09 2025 is 7.33 (NOAA Scale
G3).

NOAA Kp index breakdown Nov 07-Nov 09 2025

             Nov 07       Nov 08       Nov 09
00-03UT       7.33 (G3)    4.67 (G1)    3.67
03-06UT       6.00 (G2)    4.67 (G1)    3.67
06-09UT       5.00 (G1)    4.00         3.00
09-12UT       7.33 (G3)    3.67         3.00
12-15UT       6.33 (G2)    3.33         3.00
15-18UT       4.67 (G1)    4.00         3.00
18-21UT       3.67         5.67 (G2)    3.33
21-00UT       3.33         4.33         3.33

Rationale: G1-G3 (Minor-Strong) geomagnetic storms are likely on 07 Nov,
and G1-G2 (Minor-Moderate) on 08 Nov, due to the effects of a coronal
hole combined with multiple CMEs.

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 07-Nov 09 2025

              Nov 07  Nov 08  Nov 09
S1 or greater   20%     20%     20%

Rationale: There exists a slight chance for S1 (Minor) or greater solar
radiation storms over 07-09 Nov due primarily to the eruptive potential
of Region 4274.

C. NOAA Radio Blackout Activity and Forecast

Radio blackouts reaching the R1 levels were observed over the past 24
hours. The largest was at Nov 06 2025 0431 UTC.

Radio Blackout Forecast for Nov 07-Nov 09 2025

              Nov 07        Nov 08        Nov 09
R1-R2           80%           80%           80%
R3 or greater   35%           35%           35%

Rationale: R1-R2 (Minor-Moderate) radio blackouts are expected, with a
chance for R3 (Strong), due primarily to the flare potential of Region
4274.



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