roduct: 3-Day Forecast
:Issued: 2026 Mar 26 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 5 (NOAA Scale
G1). The greatest expected 3 hr Kp for Mar 26-Mar 28 2026 is 4.67 (NOAA
Scale G1).

NOAA Kp index breakdown Mar 26-Mar 28 2026

             Mar 26       Mar 27       Mar 28
00-03UT       4.67 (G1)    2.33         1.67     
03-06UT       4.67 (G1)    2.67         2.00     
06-09UT       4.00         2.00         1.33     
09-12UT       2.67         2.00         0.67     
12-15UT       2.67         1.67         1.33     
15-18UT       3.00         2.00         1.33     
18-21UT       2.33         2.00         1.67     
21-00UT       2.00         2.33         1.67     

Rationale: G1 (Minor) geomagnetic storms are expected on 26 Mar due to a
possible glancing blow from a CME that left the Sun on 22 Mar. No
further G1 (Minor) or greater geomagnetic storms are expected on 27-28
Mar.

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 Mar 26-Mar 28 2026

              Mar 26  Mar 27  Mar 28
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 Mar 26-Mar 28 2026

              Mar 26        Mar 27        Mar 28
R1-R2           30%           30%           30%
R3 or greater    5%            5%            5%

Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts,
with a slight chance for R3 (Strong) events through 28 Mar.


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