377
FXXX10 KWNP 071231
DAYTDF

:Product: 3-Day Forecast
:Issued: 2025 Jun 07 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 4 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Jun 07-Jun 09 2025 is 5.00 (NOAA Scale
G1).

NOAA Kp index breakdown Jun 07-Jun 09 2025

             Jun 07       Jun 08       Jun 09
00-03UT       2.00         4.00         2.67
03-06UT       2.00         3.67         2.00
06-09UT       4.00         3.00         2.00
09-12UT       4.33         3.00         2.67
12-15UT       3.00         2.33         2.67
15-18UT       3.33         2.00         2.67
18-21UT       3.33         2.00         3.00
21-00UT       5.00 (G1)    3.33         4.00

Rationale: G1 (Minor) geomagnetic storms are likely on 07 Jun due to
transient influence.

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 Jun 07-Jun 09 2025

              Jun 07  Jun 08  Jun 09
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 Jun 07-Jun 09 2025

              Jun 07        Jun 08        Jun 09
R1-R2           35%           35%           35%
R3 or greater    5%            5%            5%

Rationale: A chance exists for R1-R2 (Minor-Moderate) radio blackouts
over 07-09 Jun.