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  NOAA 3 Day Space Weather Forecast
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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 25-Sep 27 2017 is 5 (NOAA Scale
G1).

NOAA Kp index breakdown Sep 25-Sep 27 2017

            Sep 25     Sep 26     Sep 27
00-03UT        4          3          2     
03-06UT        4          2          2     
06-09UT        3          2          1     
09-12UT        3          2          2     
12-15UT        3          2          4     
15-18UT        2          2          5 (G1)
18-21UT        2          2          5 (G1)
21-00UT        3          2          5 (G1)

Rationale: The geomagnetic field is expected to be at quiet to active
levels on day one (25 Sep) and quiet to unsettled levels on day two (26
Sep) due to negative polarity CH HSS effects.  By mid to late on day
three (27 Sep), a positive polarity CH HSS is expected to become
geoeffective causing active to G1 (Minor) geomagnetic storm conditions.

B. NOAA Solar Radiation Activity Observation and Forecast

Solar radiation, as observed by NOAA GOES-13 over the past 24 hours, was
below S-scale storm level thresholds.

Solar Radiation Storm Forecast for Sep 25-Sep 27 2017

              Sep 25  Sep 26  Sep 27
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 25-Sep 27 2017

              Sep 25        Sep 26        Sep 27
R1-R2           15%           15%           15%
R3 or greater    1%            1%            1%

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