WGN-TV Chief Meteorologist Tom Skilling and the WGN Weather Center staff provide daily coverage of weather in the Chicago area.

Squall line's approach turns heads at the Chicagoland Speedway in Joliet Thursday evening

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The Lilianstrom family of Streamwood was at the Chicagoland Speedway in Joliet as Thursday's squall line moved in around 7:30 p.m. Al Lilianstrom took this photograph and shares it with us. Many thanks Al -- great shots!
--Tom Skilling, Chief Meteorologist, WGN-TV/Chicago Tribune

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Photo courtesy of Al Lilianstrom of Streamwood