Thunderstorm Wind in Gregory County, South Dakota

Thunderstorm Wind August 16, 2025 · Gregory County, South Dakota

68 mph

Measured gust (59 kt)

Where the report was made, with tornadoes recorded within 15 miles over the years.

What the National Weather Service wrote

Thunderstorm wind gusts were measured by South Dakota Mesonet station GRMS2 Gregory 16N.

The wider storm

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.

Began near Dixon (43.4600, -99.4400).

Source: NOAA Storm Events Database, event 1290599. Narratives are written by the National Weather Service forecast office that issued the report.

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