Thunderstorm Wind in Aurora County, South Dakota

A full-sized tree with an estimated diameter of at least 16 inches was broken in half. Some minor building damage occurred from the thunderstorm wind gusts.

A weak wave lifting out of the central Rockies aided in the initiation of a forward propagating Mesoscale Convective System from the lee of the Black Hills southward into the Nebraska Panhandle. With abundant MUCAPE up to nearly 4000 J/kg and DCAPE up to 1500 J/kg, but deep-layer shear only around 20-25 knots, storms retained a somewhat outflow dominant character while on an east-northeast trek. Winds were generally from 60 to 80 mph with significant damage to trees and a few structures along the track of the system north of Interstate 90 into southwest Minnesota. Around 600 customers were without power across Jerauld, Sanborn and Kingsbury Counties.