Subj : 3 Day Space Weather Forecast
To   : All
From : Sean Dennis
Date : Sat Jun 13 2026 12:19 am

:Product: 3-Day Forecast
:Issued: 2026 Jun 13 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 13-Jun 15 2026 is 5.67 (NOAA Scale
G2).

NOAA Kp index breakdown Jun 13-Jun 15 2026

             Jun 13       Jun 14       Jun 15
00-03UT       3.33         4.67 (G1)    3.00     
03-06UT       4.67 (G1)    4.00         2.33     
06-09UT       5.67 (G2)    3.33         3.67     
09-12UT       3.00         3.33         2.67     
12-15UT       4.67 (G1)    2.67         2.67     
15-18UT       5.00 (G1)    2.67         2.00     
18-21UT       4.33         3.67         2.33     
21-00UT       4.33         4.00         2.33     

Rationale: Geomagnetic field conditions are likely to reach G2
(Moderate) geomagnetic storm levels on 13 Jun due to the persistence of
the high-speed stream combined with the anticipated arrival of CMEs that
left the Sun over 09 Jun and 11 Jun. Conditions are expected to decrease
on 14 Jun, with isolated G1 (Minor) storming periods still likely, as
CME influences wane.

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 13-Jun 15 2026

              Jun 13  Jun 14  Jun 15
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 13-Jun 15 2026

              Jun 13        Jun 14        Jun 15
R1-R2           35%           35%           35%
R3 or greater    5%            5%            5%

Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts
on 13-15 Jun, primarily due to the potential of Regions 4464 and 4465.


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