Subj : 3 Day Space Weather Forecast
To   : All
From : Sean Dennis
Date : Wed Oct 28 2026 12:19 am

:Product: 3-Day Forecast
:Issued: 2026 Oct 28 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 Oct 28-Oct 30 2026 is 2.33 (below NOAA
Scale levels).

NOAA Kp index breakdown Oct 28-Oct 30 2026

             Oct 28       Oct 29       Oct 30
00-03UT       1.33         1.67         2.33         
03-06UT       1.33         1.33         2.33         
06-09UT       1.00         1.33         2.33         
09-12UT       1.00         1.33         2.00         
12-15UT       0.67         1.33         2.00         
15-18UT       1.33         1.33         2.00         
18-21UT       1.67         1.67         1.67         
21-00UT       1.67         1.67         2.00         

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 Oct 28-Oct 30 2026

              Oct 28  Oct 29  Oct 30
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 28-Oct 30 2026

              Oct 28        Oct 29        Oct 30
R1-R2            5%            5%            5%
R3 or greater    1%            1%            1%

Rationale: No R1 (Minor) or greater radio blackouts are expected. No
significant active region flare activity is forecast.


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