126
FXXX10 KWNP 110031
DAYTDF

:Product: 3-Day Forecast
:Issued: 2025 Apr 11 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 Apr 11-Apr 13 2025 is 4.67 (NOAA Scale
G1).

NOAA Kp index breakdown Apr 11-Apr 13 2025

             Apr 11       Apr 12       Apr 13
00-03UT       4.67 (G1)    4.33         3.67
03-06UT       3.67         4.00         3.00
06-09UT       2.67         4.00         2.67
09-12UT       2.33         4.00         2.00
12-15UT       2.33         2.67         3.00
15-18UT       2.67         2.67         3.00
18-21UT       3.00         2.67         3.00
21-00UT       3.67         2.33         3.00

Rationale: An isolated early period of a G1 (Minor) geomagnetic storm is
expected on 11 Apr in response to waning, but continuing CH HSS
influences.

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 11-Apr 13 2025

              Apr 11  Apr 12  Apr 13
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 11-Apr 13 2025

              Apr 11        Apr 12        Apr 13
R1-R2           45%           45%           45%
R3 or greater    5%            5%            5%

Rationale: No R1 (Minor) or greater radio blackouts are expected.  No
significant active region flare activity is forecast.