Thunderstorm Wind in Brule County, South Dakota

Thunderstorm Wind June 4, 2026 · Brule County, South Dakota

62 mph

Measured gust (54 kt)

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

What the National Weather Service wrote

Thunderstorm wind gust measured by AWOS station K9V9 near Chamberlain.

The wider storm

Leftover boundaries from June 3 thunderstorms and diurnally driven MLCAPE up to 1500-2000 J/kg triggered rapid storm development in the mid-James River Valley by mid-to-late afternoon. These storms intensified due to 40-45 kts of effective shear, producing hail as large as baseballs.

Began near (9v9)chamberlain Arp (43.7700, -99.3200).

Source: NOAA Storm Events Database, event 1345481. Narratives are written by the National Weather Service forecast office that issued the report.

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