Subj : 3 Day Space Weather Forecast
To   : All
From : Sean Dennis
Date : Wed Jun 11 2025 00:19:02

:Product: 3-Day Forecast
:Issued: 2025 Jun 11 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 11-Jun 13 2025 is 4.00 (below NOAA
Scale levels).

NOAA Kp index breakdown Jun 11-Jun 13 2025

             Jun 11       Jun 12       Jun 13
00-03UT       2.33         2.33         3.67
03-06UT       3.00         2.67         3.33
06-09UT       2.67         1.67         3.33
09-12UT       2.33         2.00         2.67
12-15UT       1.33         2.00         2.67
15-18UT       1.00         2.00         2.67
18-21UT       3.33         2.00         3.00
21-00UT       4.00         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 11-Jun 13 2025

              Jun 11  Jun 12  Jun 13
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 11-Jun 13 2025

              Jun 11        Jun 12        Jun 13
R1-R2           35%           35%           35%
R3 or greater    5%            5%            5%

Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts
all three days.



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