005
FXXX10 KWNP 110031
DAYTDF

:Product: 3-Day Forecast
:Issued: 2026 Aug 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 2 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Aug 11-Aug 13 2026 is 5.00 (NOAA Scale
G1).

NOAA Kp index breakdown Aug 11-Aug 13 2026

             Aug 11       Aug 12       Aug 13
00-03UT       2.33         2.00         3.33
03-06UT       2.67         3.67         2.67
06-09UT       2.33         5.00 (G1)    2.67
09-12UT       2.33         4.00         2.33
12-15UT       2.00         3.33         2.33
15-18UT       2.00         2.33         2.33
18-21UT       2.00         2.67         2.00
21-00UT       2.00         3.33         2.00

Rationale: G1 (Minor) geomagnetic storming is likely on 12 Aug due to
anticipated CME activity.

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 Aug 11-Aug 13 2026

              Aug 11  Aug 12  Aug 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 Aug 11-Aug 13 2026

              Aug 11        Aug 12        Aug 13
R1-R2            1%            1%            1%
R3 or greater    1%            1%            1%

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