Thunderstorm Wind — Gregory, South Dakota

2025-08-13 · near Herrick, Gregory, South Dakota

54 MG

Magnitude

Event narrative

Thunderstorm wind gusts as high as 62 mph were measured by a personal weather station.

Wider weather episode

Thunderstorms initiated along the higher terrain of western South Dakota and moved eastward through a stout instability axis from 2000-2500 J/kg MUCAPE and deep-layer shear up to 40 knots. However, the storms quickly outran the better parameters and weakened moving into southeast South Dakota, but not before linear storms produced areas of 60 to 65 mph wind across Gregory County. Additional storms developed several hours later during the early morning hours with isolated wind damage southeast of Huron.

View location on OpenStreetMap → (43.1900, -99.1200)

Source: NOAA Storm Events Database, event_id 1290506. Narrative written by the NWS forecast office that issued the report.