Hail in Bon Homme County, South Dakota

Hail July 9, 2025 · Bon Homme County, South Dakota

1 in

Hail diameter

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

The wider storm

A quick-moving short wave acted upon an environment of 2000 to 3000 J/kg of instability and 25 to 30 kts of bulk shear to generate an eastward moving line of thunderstorms across central and southeast South Dakota during the late evening of July 9 and into the early overnight hours of July 10. With waning instability, the thunderstorms weakened as they approached the I-29 corridor, but still produced scattered severe wind gusts up to 70 mph and hail up to 1 inch in diameter.

Began near Tyndall (42.9900, -97.8700).

Source: NOAA Storm Events Database, event 1287147. Narratives are written by the National Weather Service forecast office that issued the report.

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