Subj : 3 Day Space Weather Forecast
To   : All
From : Sean Dennis
Date : Mon Jun 22 2026 00:19:02

:Product: 3-Day Forecast
:Issued: 2026 Jun 22 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 2 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Jun 22-Jun 24 2026 is 3.67 (below NOAA
Scale levels).

NOAA Kp index breakdown Jun 22-Jun 24 2026

             Jun 22       Jun 23       Jun 24
00-03UT       1.67         1.67         1.67     
03-06UT       2.00         2.00         2.33     
06-09UT       2.00         1.67         1.67     
09-12UT       1.67         1.33         1.67     
12-15UT       1.00         1.33         2.67     
15-18UT       1.00         0.67         2.67     
18-21UT       0.67         1.00         3.67     
21-00UT       1.67         1.67         3.67     

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 22-Jun 24 2026

              Jun 22  Jun 23  Jun 24
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

Radio blackouts reaching the R2 levels were observed over the past 24
hours. The largest was at Jun 21 2026 1929 UTC.

Radio Blackout Forecast for Jun 22-Jun 24 2026

              Jun 22        Jun 23        Jun 24
R1-R2           40%           40%           40%
R3 or greater    5%            5%            5%

Rationale: There is an increasing chance for R1-R2 (Minor-Moderate)
radio blackouts on 22-24 Jun, due primarily to the flare potential of
Region 4473.


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