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NOAA SWPC 3-Day Forecast

:Product: 3-Day Forecast
:Issued: 2026 Oct 30 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 30-Nov 01 2026 is 5.00 (NOAA Scale
G1).

NOAA Kp index breakdown Oct 30-Nov 01 2026

             Oct 30       Oct 31       Nov 01
00-03UT       1.67         5.00 (G1)    3.67         
03-06UT       1.67         4.67 (G1)    4.67 (G1)    
06-09UT       2.33         4.33         3.33         
09-12UT       0.33         4.00         2.67         
12-15UT       0.33         3.00         2.33         
15-18UT       0.67         3.00         3.33         
18-21UT       2.67         3.67         3.67         
21-00UT       3.67         4.00         3.33         

Rationale: G1 (Minor) geomagnetic storms are likely on 31 Oct and 01 Nov
due to CH HSS influences.

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 30-Nov 01 2026

              Oct 30  Oct 31  Nov 01
S1 or greater    1%      1%      1%

Rationale: No S1 (Minor) or greater solar radiation storms are expected
through 01 Nov.

C. NOAA Radio Blackout Activity and Forecast

No radio blackouts were observed over the past 24 hours.

Radio Blackout Forecast for Oct 30-Nov 01 2026

              Oct 30        Oct 31        Nov 01
R1-R2            1%            1%            1%
R3 or greater    1%            1%            1%

Rationale: No R1 (Minor) or greater radio blackouts are expected through
01 Nov.