182
FXXX10 KWNP 250031
DAYTDF

:Product: 3-Day Forecast
:Issued: 2026 Apr 25 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 3 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Apr 25-Apr 27 2026 is 4.67 (NOAA Scale
G1).

NOAA Kp index breakdown Apr 25-Apr 27 2026

             Apr 25       Apr 26       Apr 27
00-03UT       3.33         4.67 (G1)    2.67
03-06UT       3.00         4.33         2.67
06-09UT       2.33         3.67         2.33
09-12UT       2.33         3.00         2.33
12-15UT       2.00         3.00         2.33
15-18UT       2.67         2.33         2.33
18-21UT       4.33         2.67         2.33
21-00UT       4.67 (G1)    3.00         2.00

Rationale: Isolated G1-G2 (Minor-Moderate) geomagnetic storming
conditions are possible late on 25 Apr into early 26 Apr in response to
the arrival of the glancing CMEs.

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 25-Apr 27 2026

              Apr 25  Apr 26  Apr 27
S1 or greater   25%     20%     10%

Rationale: There is a chance for S1 (Minor) or greater solar radiation
storms due to the flare activity of Region 4419 as it rotates toward the
western limb and Region 4420 as it approaches central solar meridian.

C. NOAA Radio Blackout Activity and Forecast

Radio blackouts reaching the R3 levels were observed over the past 24
hours. The largest was at Apr 24 2026 0813 UTC.

Radio Blackout Forecast for Apr 25-Apr 27 2026

              Apr 25        Apr 26        Apr 27
R1-R2           75%           75%           70%
R3 or greater   35%           30%           20%

Rationale: R1-R2 (Minor-Moderate) radio blackouts are expected through
26 Apr, with a chance for R3 (Strong or greater) radio blackouts,
primarily driven by the ongoing complexity of Regions 4419 and 4420.