 roduct: 3-Day Forecast
:Issued: 2026 Jul 28 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 3 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Jul 28-Jul 30 2026 is 3.67 (below NOAA
Scale levels).
NOAA Kp index breakdown Jul 28-Jul 30 2026
Jul 28 Jul 29 Jul 30
00-03UT 3.67 2.67 2.00
03-06UT 3.33 2.00 1.67
06-09UT 2.00 2.00 2.00
09-12UT 3.00 2.00 2.00
12-15UT 3.33 2.00 2.00
15-18UT 2.00 2.00 2.33
18-21UT 3.33 2.00 2.67
21-00UT 3.00 2.33 2.67
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 Jul 28-Jul 30 2026
Jul 28 Jul 29 Jul 30
S1 or greater 5% 5% 5%
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 27 2026 0243 UTC.
Radio Blackout Forecast for Jul 28-Jul 30 2026
Jul 28 Jul 29 Jul 30
R1-R2 40% 40% 40%
R3 or greater 10% 10% 10%
Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts
and a slight chance for R3 (Strong) or greater blackouts on 28-30 Jul.
--- MBSE BBS v1.1.7.2 (Linux-x86_64)
* Origin: Outpost BBS * Johnson City, TN (618:618/1)
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