816
FXXX10 KWNP 281231
DAYTDF

:Product: 3-Day Forecast
:Issued: 2026 Jan 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 Jan 28-Jan 30 2026 is 4.67 (NOAA Scale
G1).

NOAA Kp index breakdown Jan 28-Jan 30 2026

             Jan 28       Jan 29       Jan 30
00-03UT       3.33         3.33         2.67
03-06UT       3.33         3.67         2.67
06-09UT       2.67         3.00         2.33
09-12UT       3.00         2.33         2.33
12-15UT       4.00         2.67         2.33
15-18UT       4.67 (G1)    3.33         2.33
18-21UT       3.33         3.67         2.00
21-00UT       4.33         4.00         2.33

Rationale: G1 (Minor) geomagnetic storms are likely on 28 Jan due to 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 Jan 28-Jan 30 2026

              Jan 28  Jan 29  Jan 30
S1 or greater    5%      5%      5%

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 Jan 28-Jan 30 2026

              Jan 28        Jan 29        Jan 30
R1-R2           25%           25%           20%
R3 or greater    5%            5%            5%

Rationale: A chance for R1-R2 (Minor-Moderate) radio blackouts due to
isolated M-class flares will persist through 30 Jan.