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NOAA SWPC 3-Day Forecast

:Product: 3-Day Forecast
:Issued: 2026 Oct 29 1230 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 2 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Oct 29-Oct 31 2026 is 5.00 (NOAA Scale
G1).

NOAA Kp index breakdown Oct 29-Oct 31 2026

             Oct 29       Oct 30       Oct 31
00-03UT       1.67         2.00         5.00 (G1)    
03-06UT       2.33         1.67         4.67 (G1)    
06-09UT       1.67         1.67         4.33         
09-12UT       1.33         1.00         4.00         
12-15UT       1.33         1.33         3.00         
15-18UT       1.33         3.00         3.00         
18-21UT       1.67         3.33         3.67         
21-00UT       2.33         4.33         4.00         

Rationale: G1 (Minor) or greater geomagnetic storms are expected on 31
Oct due to the anticipated arrival of a recurrent positive polarity
coronal hole high speed stream.

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 29-Oct 31 2026

              Oct 29  Oct 30  Oct 31
S1 or greater    1%      1%      1%

Rationale: No S1 (Minor) or greater solar radiation storms are expected
through 31 Oct.

C. NOAA Radio Blackout Activity and Forecast

No radio blackouts were observed over the past 24 hours.

Radio Blackout Forecast for Oct 29-Oct 31 2026

              Oct 29        Oct 30        Oct 31
R1-R2            1%            1%            1%
R3 or greater    1%            1%            1%

Rationale: No R1 (Minor) or greater radio blackouts are expected through
31 Oct.