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

:Product: 3-Day Forecast
:Issued: 2026 Jun 19 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 19-Jun 21 2026 is 4.00 (below NOAA
Scale levels).

NOAA Kp index breakdown Jun 19-Jun 21 2026

             Jun 19       Jun 20       Jun 21
00-03UT       3.00         3.00         2.67     
03-06UT       4.00         3.67         2.00     
06-09UT       3.67         2.67         2.33     
09-12UT       3.00         2.33         2.33     
12-15UT       3.00         2.00         2.33     
15-18UT       2.00         2.00         2.33     
18-21UT       1.67         2.33         2.33     
21-00UT       3.00         3.00         2.67     

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 19-Jun 21 2026

              Jun 19  Jun 20  Jun 21
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 Jun 19-Jun 21 2026

              Jun 19        Jun 20        Jun 21
R1-R2           15%           15%           15%
R3 or greater    1%            1%            1%

Rationale: There is a slight chance for R1 (Minor) radio blackouts on
19-21 Jun.


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