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Thunderstorm Wind in Williamson County, Illinois

Thunderstorm Wind May 20, 2025 · Williamson County, Illinois

60 mph

Estimated gust (52 kt)

$12K

Damage as recorded

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

What the National Weather Service wrote

A tree was blown down onto a car in Herrin.

The wider storm

A squall line pushed eastward overnight across the warm sector of a low pressure system in Iowa. A surging portion of the line produced wind damage in portions of Southern Illinois, including the formation of a brief tornado in eastern Union County. MLCAPE was around 1000-1500J/kg, effective bulk shear was 40-50kts, and 0-3km SRH was 200-300m2/s2, with dewpoints in the mid to upper 60s.

Began near Herrin (37.8000, -89.0300).

Other tornadoes from the same storm system

1 more tornado the National Weather Service filed under this storm episode.

EF1 Union County

Source: NOAA Storm Events Database, event 1272611. Narratives are written by the National Weather Service forecast office that issued the report.

Tornadoes near your address

See every tornado that passed near a place you know, measured to its path.