500
FXXX10 KWNP 301231
DAYTDF

:Product: 3-Day Forecast
:Issued: 2026 May 30 1230 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Product description and SWPC contact on the Web
# http://www.swpc.noaa.gov/wwire.html
#
#             3-Day Forecast
#
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 May 30-Jun 01 2026 is 4.00 (below NOAA
Scale levels).

NOAA Kp index breakdown May 30-Jun 01 2026

             May 30       May 31       Jun 01
00-03UT       3.33         3.00         3.00
03-06UT       3.00         2.33         3.00
06-09UT       1.33         2.33         2.67
09-12UT       1.67         1.67         2.00
12-15UT       2.00         3.33         2.67
15-18UT       3.00         2.67         2.00
18-21UT       1.00         4.00         2.67
21-00UT       2.00         3.67         2.67

Rationale: No G1 (Minor) or greater geomagnetic storms are expected.  No
significant transient or recurrent solar wind features are forecast.

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 2026

              May 30  May 31  Jun 01
S1 or greater    5%      5%      5%

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 May 30-Jun 01 2026

              May 30        May 31        Jun 01
R1-R2           40%           40%           40%
R3 or greater    5%            5%            5%

Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts
over 30 May-01 Jun.