Thunderstorm Wind — Sully, South Dakota

2022-07-05 · near Gallagher, Sully, South Dakota

Wider weather episode

Severe thunderstorms developed in Montana during the evening of July 4th then moved into northwestern South Dakota during the early morning hours of July 5th. The storms intensified around daybreak on July 5th, as they encountered a more favorable environment for severe storms. The storms started as supercells and then evolved into a derecho, with embedded supercells as they moved through Hand and Hyde counties. The significant severe storms tracked southeast across central South Dakota, into southeastern South Dakota, and eventually into northern Iowa while producing winds up to 91 mph and hail to the size of softballs in central South Dakota. The storms caused widespread damage to trees, grain bins, crops, and vehicles. Some of the highest wind gusts include 91 mph 4 miles north of Agar, 87 mph 1 mile north of Ree Heights, 84 mph 1 mile south-southwest of Timber Lake, and 77 mph 12 miles east-southeast of Sunshine Bible Academy. Hail, 4 inches in diameter, was reported in Promise and 2 miles north of Timber Lake.

View location on OpenStreetMap → (44.7400, -100.6200)

Source: NOAA Storm Events Database, event_id 1045316. Narrative written by the NWS forecast office that issued the report.