Hail in Union County, South Dakota

Hail May 18, 2026 · Union County, South Dakota

0.88 in

Hail diameter

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

The wider storm

A slow moving frontal boundary from northeast Nebraska into northwest Iowa focused development of scattered thunderstorms during the late afternoon and very early evening. Storms fired and intensified with elevated instability above a stratus layer around 1000-1500 J/kg and 40-50 knots of effective shear. Stronger and more organized cells produced large hail up to golf ball size. Back on the cooler side of the boundary, only smaller hail occurred.

Began near Elk Pt (42.6800, -96.6800).

Source: NOAA Storm Events Database, event 1343987. Narratives are written by the National Weather Service forecast office that issued the report.

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