Subj : 3 Day Space Weather Forecast
To   : All
From : Sean Dennis
Date : Thu Jun 25 2026 12:19 am

:Product: 3-Day Forecast
:Issued: 2026 Jun 25 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 4 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Jun 25-Jun 27 2026 is 4.00 (below NOAA
Scale levels).

NOAA Kp index breakdown Jun 25-Jun 27 2026

             Jun 25       Jun 26       Jun 27
00-03UT       3.67         3.33         3.00     
03-06UT       4.00         3.67         3.67     
06-09UT       2.67         2.00         2.00     
09-12UT       2.67         1.67         2.67     
12-15UT       1.67         3.00         2.00     
15-18UT       1.67         3.67         2.00     
18-21UT       2.67         3.33         2.67     
21-00UT       3.67         3.00         3.00     

Rationale: No G1 (Minor) or greater geomagnetic storms are expected. 
Periods of active conditions are likely 25-27 Jun in response to -CH HSS
influences.

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 25-Jun 27 2026

              Jun 25  Jun 26  Jun 27
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

No radio blackouts were observed over the past 24 hours.

Radio Blackout Forecast for Jun 25-Jun 27 2026

              Jun 25        Jun 26        Jun 27
R1-R2           50%           50%           50%
R3 or greater   10%           10%           10%

Rationale: There is a high chance for R1-R2 (Minor-Moderate) radio
blackouts 54-27 Jun due primarily to the flare potential of Region 4478.


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