133
FXXX10 KWNP 281231
DAYTDF

:Product: 3-Day Forecast
:Issued: 2026 Jul 28 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 3 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Jul 28-Jul 30 2026 is 4.00 (below NOAA
Scale levels).

NOAA Kp index breakdown Jul 28-Jul 30 2026

             Jul 28       Jul 29       Jul 30
00-03UT       2.33         2.67         3.00
03-06UT       1.33         2.00         1.67
06-09UT       1.67         2.00         2.00
09-12UT       2.33         2.00         2.00
12-15UT       2.67         2.00         2.00
15-18UT       2.00         2.00         2.33
18-21UT       2.67         2.00         3.33
21-00UT       3.67         2.33         4.00

Rationale: The geomagnetic field is expected to be quiet to active
(below G1-Minor) on 29 Jul as weak CME effects persist. Unsettled to
active levels are likely again beginning late on 30 Jul with the arrival
of the 26-27 Jul 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 Jul 28-Jul 30 2026

              Jul 28  Jul 29  Jul 30
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 Jul 28-Jul 30 2026

              Jul 28        Jul 29        Jul 30
R1-R2           30%           30%           30%
R3 or greater    1%            1%            1%

Rationale: Solar activity is expected to be low with a chance for
M-class flares (R1-R2, Minor-Moderate) through 30 Jul.