Subj : 3 Day Space Weather Forecast
To   : All
From : Sean Dennis
Date : Sat Nov 01 2025 00:19:02

:Product: 3-Day Forecast
:Issued: 2025 Nov 01 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 5 (NOAA Scale
G1).
The greatest expected 3 hr Kp for Nov 01-Nov 03 2025 is 4.00 (below NOAA
Scale levels).

NOAA Kp index breakdown Nov 01-Nov 03 2025

             Nov 01       Nov 02       Nov 03
00-03UT       4.00         3.33         2.67
03-06UT       3.33         4.00         3.67
06-09UT       3.33         3.33         3.00
09-12UT       3.00         2.67         2.67
12-15UT       3.67         2.33         2.33
15-18UT       2.67         2.00         2.33
18-21UT       2.67         2.33         2.00
21-00UT       3.33         3.33         2.67

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 Nov 01-Nov 03 2025

              Nov 01  Nov 02  Nov 03
S1 or greater    1%      5%     10%

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 01-Nov 03 2025

              Nov 01        Nov 02        Nov 03
R1-R2           25%           35%           45%
R3 or greater    5%           10%           10%

Rationale: There is an increasing chance for R1-R2 (Minor-Moderate)
radio blackouts all three days. A slight chance exists for R3 (Major) or
greater blackouts on 02-03 Nov.



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