Subj : 3 Day Space Weather Forecast
To   : All
From : Sean Dennis
Date : Sat Apr 11 2026 12:19 am

:Product: 3-Day Forecast
:Issued: 2026 Apr 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 4 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Apr 11-Apr 13 2026 is 4.67 (NOAA Scale
G1).

NOAA Kp index breakdown Apr 11-Apr 13 2026

             Apr 11       Apr 12       Apr 13
00-03UT       3.67         3.67         2.67     
03-06UT       4.67 (G1)    3.67         2.67     
06-09UT       4.00         3.67         3.00     
09-12UT       4.00         2.67         2.67     
12-15UT       3.00         2.67         1.67     
15-18UT       2.67         1.67         1.67     
18-21UT       4.00         2.67         2.00     
21-00UT       4.67 (G1)    3.00         2.67     

Rationale: Periods of G1 (Minor) storm levels are expected on 11 Apr due
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 Apr 11-Apr 13 2026

              Apr 11  Apr 12  Apr 13
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 Apr 11-Apr 13 2026

              Apr 11        Apr 12        Apr 13
R1-R2            5%            5%            5%
R3 or greater    1%            1%            1%

Rationale: No R1 (Minor) or greater radio blackouts are expected.  No
significant active region flare activity is forecast.


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