Subj : 3 Day Space Weather Forecast
To   : All
From : Sean Dennis
Date : Fri May 30 2025 12:19 am

:Product: 3-Day Forecast
:Issued: 2025 May 30 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 7 (NOAA Scale
G3).
The greatest expected 3 hr Kp for May 30-Jun 01 2025 is 5.67 (NOAA Scale
G2).

NOAA Kp index breakdown May 30-Jun 01 2025

             May 30       May 31       Jun 01
00-03UT       5.00 (G1)    4.67 (G1)    4.00
03-06UT       5.67 (G2)    4.33         4.67 (G1)
06-09UT       5.67 (G2)    4.00         4.00
09-12UT       5.00 (G1)    3.33         3.67
12-15UT       3.00         3.00         2.67
15-18UT       3.33         2.33         2.00
18-21UT       3.33         2.33         2.00
21-00UT       3.67         4.00         3.33

Rationale: G1-G2 (Minor-Moderate) geomagnetic storms are expected on 30
May due to influence from a negative polarity coronal hole. G1 (Minor)
conditions are again likely on 31 May - 01 Jun due to waning coronal
hole effects.

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 May 30-Jun 01 2025

              May 30  May 31  Jun 01
S1 or greater   10%     10%     10%

Rationale: There is a slight chance for S1 (Minor) or greater solar
radiation storms over 30 May - 01 Jun.

C. NOAA Radio Blackout Activity and Forecast

No radio blackouts were observed over the past 24 hours.

Radio Blackout Forecast for May 30-Jun 01 2025

              May 30        May 31        Jun 01
R1-R2           50%           50%           50%
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), over 30 May - 01 Jun.



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