Peak Geomagnetic Activity is expected between 06 and 09 UTC with a Kp Index of 8.33 (G4 on the G-Scale).
"The K-index quantifies disturbances in the horizontal component of earth's magnetic field with an integer in the range 0-9 with 1 being calm and 5 or more indicating a geomagnetic storm.
The label 'K' comes from the German word 'Kennziffer' meaning 'characteristic digit.' The K-index was introduced by Julius Bartels in 1938."
https://www.swpc.noaa.gov/communities/aurora-dashboard-experimental
https://www.swpc.noaa.gov/products/planetary-k-index
6/n