731
FXXX10 KWNP 090031
DAYTDF

:Product: 3-Day Forecast
:Issued: 2026 Jun 09 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 Jun 09-Jun 11 2026 is 4.33 (below NOAA
Scale levels).

NOAA Kp index breakdown Jun 09-Jun 11 2026

             Jun 09       Jun 10       Jun 11
00-03UT       4.33         3.00         2.00
03-06UT       4.00         3.33         2.00
06-09UT       3.00         2.33         3.00
09-12UT       3.33         2.00         2.67
12-15UT       2.33         2.00         3.00
15-18UT       1.67         2.00         3.33
18-21UT       3.00         2.33         3.00
21-00UT       2.67         2.33         4.00

Rationale: No G1 (Minor) or greater geomagnetic storms are expected.  No
significant transient or recurrent solar wind features are forecast.

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 09-Jun 11 2026

              Jun 09  Jun 10  Jun 11
S1 or greater   10%     10%     10%

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 09-Jun 11 2026

              Jun 09        Jun 10        Jun 11
R1-R2           55%           55%           55%
R3 or greater   10%           10%           10%

Rationale: Isolated R1/R2 (Minor/Moderate) radio blackouts are likely,
with a slight chance for isolated R3 (Strong) events through 11 June,
primarily due to the flare potential exhibited by Regions 4456 (N17W61,
Dai/beta), 4462 (N15W07, Dsi/beta), 4464 and 4465.