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

:Product: 3-Day Forecast
:Issued: 2026 Jul 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 2 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Jul 31-Aug 02 2026 is 4.00 (below NOAA
Scale levels).

NOAA Kp index breakdown Jul 31-Aug 02 2026

             Jul 31       Aug 01       Aug 02
00-03UT       0.67         3.00         1.67     
03-06UT       1.00         2.33         1.33     
06-09UT       1.67         2.00         1.33     
09-12UT       1.67         1.33         1.33     
12-15UT       1.67         4.00         1.33     
15-18UT       2.33         3.67         1.33     
18-21UT       2.67         3.00         1.67     
21-00UT       3.67         2.67         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
above S-scale storm level thresholds.

Solar Radiation Storm Forecast for Jul 31-Aug 02 2026

              Jul 31  Aug 01  Aug 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

Radio blackouts reaching the R1 levels were observed over the past 24
hours. The largest was at Jul 30 2026 1700 UTC.

Radio Blackout Forecast for Jul 31-Aug 02 2026

              Jul 31        Aug 01        Aug 02
R1-R2           25%           25%           25%
R3 or greater    1%            1%            1%

Rationale: Solar activity is expected to be low with a chance for
M-class flares (R1-R2, Minor-Moderate) through 02 Aug.


--- MBSE BBS v1.1.7.2 (Linux-x86_64)
 * Origin: Outpost BBS * Johnson City, TN (1:18/200)

.