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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 28-Sep 30 2021 is 6 (NOAA Scale
G2).

NOAA Kp index breakdown Sep 28-Sep 30 2021

            Sep 28     Sep 29     Sep 30
00-03UT        2          4          3     
03-06UT        2          5 (G1)     2     
06-09UT        2          3          2     
09-12UT        3          3          2     
12-15UT        4          2          2     
15-18UT        4          2          2     
18-21UT        5 (G1)     2          2     
21-00UT        6 (G2)     3          2     

Rationale: G2 (Moderate) geomagnetic storming is likely 28 Sep due to CH
HSS and possible CME effects. G1 (Minor) geomagnetic storming is likely
29 Sep with continue CH HSS effects.

B. NOAA Solar Radiation Activity Observation and Forecast

Solar radiation, as observed by NOAA GOES-16 over the past 24 hours, was
below S-scale storm level thresholds.

Solar Radiation Storm Forecast for Sep 28-Sep 30 2021

              Sep 28  Sep 29  Sep 30
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 28-Sep 30 2021

              Sep 28        Sep 29        Sep 30
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.