roduct: 3-Day Forecast
:Issued: 2026 Jun 10 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 Jun 10-Jun 12 2026 is 4.00 (below NOAA
Scale levels).

NOAA Kp index breakdown Jun 10-Jun 12 2026

             Jun 10       Jun 11       Jun 12
00-03UT       3.67         2.00         3.67     
03-06UT       2.67         2.00         4.00     
06-09UT       2.67         3.00         4.00     
09-12UT       2.00         2.67         2.33     
12-15UT       2.67         3.00         2.00     
15-18UT       2.00         3.00         2.67     
18-21UT       2.67         3.00         2.00     
21-00UT       3.00         2.67         2.33     

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 Jun 10-Jun 12 2026

              Jun 10  Jun 11  Jun 12
S1 or greater   10%     10%     10%

Rationale: A slight chance of solar radiation storms are expected
through 12 Jun.

C. NOAA Radio Blackout Activity and Forecast

No radio blackouts were observed over the past 24 hours.

Radio Blackout Forecast for Jun 10-Jun 12 2026

              Jun 10        Jun 11        Jun 12
R1-R2           55%           55%           55%
R3 or greater   15%           15%           15%

Rationale: Solar activity is likely to be moderate (R1-R2,
Minor-Moderate) with a slight chance for an X-class flares (R3-Strong)
through 12 Jun, mainly due to the flare potential of Regions 4464
(S12E11, Ehi/beta) and 4465.


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