:Product: 3-Day Forecast
:Issued: 2026 Jul 12 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 12-Jul 14 2026 is 5.00 (NOAA Scale
G1).

NOAA Kp index breakdown Jul 12-Jul 14 2026

             Jul 12       Jul 13       Jul 14
00-03UT       2.33         3.33         2.00     
03-06UT       2.00         3.00         1.67     
06-09UT       3.33         2.67         1.67     
09-12UT       3.67         2.33         2.00     
12-15UT       5.00 (G1)    1.67         2.00     
15-18UT       4.67 (G1)    2.00         1.67     
18-21UT       4.00         2.00         1.67     
21-00UT       3.33         2.33         1.67     

Rationale: G1 (Minor)geomagnetic storming conditions are likely on 12
Jul due to the anticipated arrival of a CME that left the Sun on 09 Jul.

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 12-Jul 14 2026

              Jul 12  Jul 13  Jul 14
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 Jul 12-Jul 14 2026

              Jul 12        Jul 13        Jul 14
R1-R2           25%           25%           20%
R3 or greater    5%            5%            1%

Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts
over 12-14 Jul.