:Product: 3-Day Forecast
:Issued: 2018 Sep 24 1230 UTC
# Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center
#
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 Sep 24-Sep 26 2018 is 4 (below NOAA
Scale levels).

NOAA Kp index breakdown Sep 24-Sep 26 2018

            Sep 24     Sep 25     Sep 26
00-03UT        3          3          3     
03-06UT        3          3          3     
06-09UT        2          3          2     
09-12UT        2          2          2     
12-15UT        2          2          1     
15-18UT        2          2          1     
18-21UT        3          2          2     
21-00UT        4          3          2     

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-15 over the past 24 hours, was
below S-scale storm level thresholds.

Solar Radiation Storm Forecast for Sep 24-Sep 26 2018

              Sep 24  Sep 25  Sep 26
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 Sep 24-Sep 26 2018

              Sep 24        Sep 25        Sep 26
R1-R2            1%            1%            1%
R3 or greater    1%            1%            1%

Rationale: No R1 (Minor) or greater radio blackouts are expected.  No
significant active region flare activity is forecast.