Thunderstorm Wind in Gregory County, South Dakota

Thunderstorm Wind June 9, 2026 · Gregory County, South Dakota

70 mph

Measured gust (61 kt)

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

What the National Weather Service wrote

Thunderstorm wind gust was measured by a personal weather station.

The wider storm

A large-scale mid-level trough nudged out into the Northern Plains while a strong frontal boundary moved out across the Dakotas. Storms initiated with up to 3000 J/kg elevated CAPE near a surface boundary. Storms quickly organized into a linear system with short bowing segments which produced gusts of 60 to 75 mph. A large trailing stratiform precipitation shield developed featuring a strong wake-low an hour or two after the strong thunderstorm outflow winds with gusts up to 70 mph.

Began near Herrick (43.1900, -99.1200).

Source: NOAA Storm Events Database, event 1346189. Narratives are written by the National Weather Service forecast office that issued the report.

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