roduct: 3-Day Forecast
:Issued: 2026 Apr 20 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 6 (NOAA Scale
G2).
The greatest expected 3 hr Kp for Apr 20-Apr 22 2026 is 4.00 (below NOAA
Scale levels).

NOAA Kp index breakdown Apr 20-Apr 22 2026

             Apr 20       Apr 21       Apr 22
00-03UT       3.67         3.33         2.67     
03-06UT       3.67         4.00         2.00     
06-09UT       3.33         3.00         2.33     
09-12UT       3.33         2.67         2.00     
12-15UT       3.33         2.33         2.00     
15-18UT       2.00         3.00         2.33     
18-21UT       3.33         2.67         2.00     
21-00UT       3.33         2.33         2.00     

Rationale: No G1 (Minor) or greater geomagnetic storms are expected as
the CH HSS ongoing effect wanes.

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 20-Apr 22 2026

              Apr 20  Apr 21  Apr 22
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 20-Apr 22 2026

              Apr 20        Apr 21        Apr 22
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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