683
FXXX10 KWNP 261231
DAYTDF

:Product: 3-Day Forecast
:Issued: 2025 Apr 26 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 2 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Apr 26-Apr 28 2025 is 4.00 (below NOAA
Scale levels).

NOAA Kp index breakdown Apr 26-Apr 28 2025

             Apr 26       Apr 27       Apr 28
00-03UT       2.00         3.33         3.00
03-06UT       2.00         2.00         2.00
06-09UT       1.33         2.00         2.00
09-12UT       2.33         3.00         2.67
12-15UT       2.00         3.00         2.67
15-18UT       2.00         4.00         2.67
18-21UT       2.00         3.33         2.67
21-00UT       2.00         3.00         3.00

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 Apr 26-Apr 28 2025

              Apr 26  Apr 27  Apr 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 Apr 26-Apr 28 2025

              Apr 26        Apr 27        Apr 28
R1-R2           40%           40%           40%
R3 or greater    1%            1%            1%

Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts
over 26-28 Apr.