Subj : 3 Day Space Weather Forecast
To   : All
From : Sean Dennis
Date : Sun Aug 09 2026 12:19 am

:Product: 3-Day Forecast
:Issued: 2026 Aug 09 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 6 (NOAA Scale
G2).
The greatest expected 3 hr Kp for Aug 09-Aug 11 2026 is 3.67 (below NOAA
Scale levels).

NOAA Kp index breakdown Aug 09-Aug 11 2026

             Aug 09       Aug 10       Aug 11
00-03UT       3.33         2.33         2.67     
03-06UT       3.67         2.67         3.00     
06-09UT       3.33         2.00         2.33     
09-12UT       2.33         2.00         1.67     
12-15UT       2.00         2.00         2.00     
15-18UT       2.00         2.00         2.00     
18-21UT       3.33         2.00         3.00     
21-00UT       3.33         2.33         3.67     

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 09-Aug 11 2026

              Aug 09  Aug 10  Aug 11
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 09-Aug 11 2026

              Aug 09        Aug 10        Aug 11
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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