350
FXXX10 KWNP 070031
DAYTDF

:Product: 3-Day Forecast
:Issued: 2025 May 07 0030 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 07-May 09 2025 is 4.67 (NOAA Scale
G1).

NOAA Kp index breakdown May 07-May 09 2025

             May 07       May 08       May 09
00-03UT       3.67         2.67         3.33
03-06UT       4.00         2.33         3.67
06-09UT       3.00         2.67         3.67
09-12UT       2.33         2.33         3.67
12-15UT       2.67         2.00         3.67
15-18UT       2.00         2.00         4.00
18-21UT       3.00         2.33         4.67 (G1)
21-00UT       2.33         2.67         4.00

Rationale: G1 (Minor) conditions are likely on 09 May due to the onset
of influence from another negative polarity CH HSS.

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 07-May 09 2025

              May 07  May 08  May 09
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 07-May 09 2025

              May 07        May 08        May 09
R1-R2           45%           45%           45%
R3 or greater    5%            5%            5%

Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts
over 07-09 May.