roduct: 3-Day Forecast
:Issued: 2026 Apr 08 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 Apr 08-Apr 10 2026 is 5.00 (NOAA Scale
G1).

NOAA Kp index breakdown Apr 08-Apr 10 2026

             Apr 08       Apr 09       Apr 10
00-03UT       2.33         3.33         2.33     
03-06UT       2.00         3.00         5.00 (G1)
06-09UT       1.67         1.67         4.67 (G1)
09-12UT       1.33         1.00         3.67     
12-15UT       0.67         0.67         2.67     
15-18UT       2.00         1.33         2.67     
18-21UT       2.33         1.33         3.67     
21-00UT       3.00         1.67         4.00     

Rationale: G1 (Minor) or greater geomagnetic storms are likely on 10 Apr
due to a new positive polarity coronal hole stream influence.

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 08-Apr 10 2026

              Apr 08  Apr 09  Apr 10
S1 or greater   10%     10%     10%

Rationale: There is a slight chance for the greater than 10 MeV proton
flux to exceed S1 (Minor) solar radiation storm levels 08-10 Apr.

C. NOAA Radio Blackout Activity and Forecast

No radio blackouts were observed over the past 24 hours.

Radio Blackout Forecast for Apr 08-Apr 10 2026

              Apr 08        Apr 09        Apr 10
R1-R2           35%           35%           35%
R3 or greater   10%           10%           10%

Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts,
with a slight chance for R3 (Strong) or greater events 08-10 Apr.


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