Subj : 3 Day Space Weather Forecast
To   : All
From : Sean Dennis
Date : Mon Aug 31 2026 12:19 am

:Product: 3-Day Forecast
:Issued: 2026 Aug 31 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 4 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Aug 31-Sep 02 2026 is 4.00 (below NOAA
Scale levels).

NOAA Kp index breakdown Aug 31-Sep 02 2026

             Aug 31       Sep 01       Sep 02
00-03UT       4.00         1.67         1.67     
03-06UT       3.33         1.33         1.67     
06-09UT       3.00         1.67         1.33     
09-12UT       2.00         1.33         1.33     
12-15UT       2.00         1.33         1.33     
15-18UT       1.00         1.33         1.33     
18-21UT       2.00         1.33         1.33     
21-00UT       2.00         1.67         1.67     

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 Aug 31-Sep 02 2026

              Aug 31  Sep 01  Sep 02
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 Aug 31-Sep 02 2026

              Aug 31        Sep 01        Sep 02
R1-R2           15%           10%           10%
R3 or greater    1%            1%            1%

Rationale: There is a slight chance for R1-R2 (Minor-Moderate) radio
blackouts over 31 Aug - 02 Sep.


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