Subj : 3 Day Space Weather Forecast
To   : All
From : Sean Dennis
Date : Mon Nov 10 2025 00:19:02

:Product: 3-Day Forecast
:Issued: 2025 Nov 10 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 Nov 10-Nov 12 2025 is 5.67 (NOAA Scale
G2).

NOAA Kp index breakdown Nov 10-Nov 12 2025

             Nov 10       Nov 11       Nov 12
00-03UT       2.67         2.67         5.67 (G2)
03-06UT       3.00         3.00         4.67 (G1)
06-09UT       3.67         2.67         4.00
09-12UT       4.67 (G1)    3.67         3.67
12-15UT       3.67         4.67 (G1)    2.67
15-18UT       2.67         5.00 (G1)    2.67
18-21UT       1.67         5.67 (G2)    1.67
21-00UT       2.67         5.67 (G2)    2.67

Rationale: G1 (Minor) geomagnetic storms are likely over 10 Nov due to
potential influence from a CME that left the Sun on 07 Nov. G2
(Moderate) conditions are possible on 11-12 Nov due to anticipated
influence from a CME that left the Sun on 09 Nov.

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 10-Nov 12 2025

              Nov 10  Nov 11  Nov 12
S1 or greater   25%     25%     25%

Rationale: There is a chance for S1 (Minor) or greater solar radiation
storms over 10-12 Nov due to multiple complex regions the visible solar
disk.

C. NOAA Radio Blackout Activity and Forecast

Radio blackouts reaching the R3 levels were observed over the past 24
hours. The largest was at Nov 09 2025 0735 UTC.

Radio Blackout Forecast for Nov 10-Nov 12 2025

              Nov 10        Nov 11        Nov 12
R1-R2           70%           70%           70%
R3 or greater   25%           25%           25%

Rationale: R1-R2 (Minor-Moderate) radio blackouts are likely, with a
chance for R3 (Strong), over 10-12 Nov due to multiple complex active
regions.



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