Brief Supercell in Extreme Northwestern South Dakota

Surface pattern showed great turning of the winds near the border between the Dakotas. Very high dewpoints were fedding into this region, although the moisture was the proverbial "skin" deep. We headed for extreme northwestern South Dakota.

This surface chart shows the region of cyclonic curvature in the surface isobars associated with the strongly backed flow in extreme northern South Dakota and southern North Dakota.

Narrow band of moderate CAPE extended into the same area.

 

Nice LPish type updraft developed southwest of Bowman. It was rotating and had some rain curtains attempting to swing around the west side. These pictures are taken looking southwest.