Subj : 3 Day Space Weather Forecast
To   : All
From : Sean Dennis
Date : Sun Oct 26 2025 00:19:01

:Product: 3-Day Forecast
:Issued: 2025 Oct 26 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 4 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Oct 26-Oct 28 2025 is 5.00 (NOAA Scale
G1).

NOAA Kp index breakdown Oct 26-Oct 28 2025

             Oct 26       Oct 27       Oct 28
00-03UT       2.00         2.00         4.00
03-06UT       1.67         2.00         4.67 (G1)
06-09UT       1.67         2.67         4.00
09-12UT       2.00         3.67         4.00
12-15UT       2.00         3.00         4.33
15-18UT       2.33         2.67         5.00 (G1)
18-21UT       2.67         2.67         4.33
21-00UT       2.33         2.67         5.00 (G1)

Rationale: G1 (Minor) conditions, with a chance for G2 (Moderate), are
likely on 28 Oct due to the anticipated onset of influence from a
positive polarity coronal hole.

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 26-Oct 28 2025

              Oct 26  Oct 27  Oct 28
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 Oct 26-Oct 28 2025

              Oct 26        Oct 27        Oct 28
R1-R2           10%           10%           10%
R3 or greater    1%            1%            1%

Rationale: A slight chance for isolated R1-R2 (Minor-Moderate) radio
blackouts continues over 26-28 Oct.



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