202
FXXX10 KWNP 120031
DAYTDF

:Product: 3-Day Forecast
:Issued: 2026 Jun 12 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 5 (NOAA Scale
G1).
The greatest expected 3 hr Kp for Jun 12-Jun 14 2026 is 5.67 (NOAA Scale
G2).

NOAA Kp index breakdown Jun 12-Jun 14 2026

             Jun 12       Jun 13       Jun 14
00-03UT       4.67 (G1)    4.67 (G1)    4.67 (G1)
03-06UT       3.67         3.33         4.00
06-09UT       2.33         5.67 (G2)    3.33
09-12UT       2.33         3.00         3.33
12-15UT       2.00         4.67 (G1)    2.67
15-18UT       3.33         5.00 (G1)    2.67
18-21UT       3.33         4.33         3.67
21-00UT       4.67 (G1)    4.33         4.00

Rationale: Geomagnetic field conditions are expected to reach G1 (Minor)
geomagnetic storming on 12 June under anticipated -CH HSS effects. G2
(Moderate) geomagnetic storming levels are likely on 13 June
due to the persistence of the high-speed stream and the arrival of the
disturbances caused by the CMEs that left the Sun on 09 and 11 June. G1
(Minor) levels are likely on 14 June, as the CMEs effects wane.

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 12-Jun 14 2026

              Jun 12  Jun 13  Jun 14
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 12-Jun 14 2026

              Jun 12        Jun 13        Jun 14
R1-R2           45%           45%           45%
R3 or greater   10%           10%           10%

Rationale: There is a high chance for R1-R2 (Minor-Moderate) radio
blackouts, and a slight chance for isolated R3 (Strong) events, mostly
due to the flare potential of Region 4465.