The National Weather Service said a storm capable of producing a tornado was spotted over Matteson at about 12:22 p.m.
The warning was in effect for southern Cook County until 12:45 p.m. The NWS warned strong thunderstorms would continue to impact southern Cook County until about 1:15 p.m.
The NWS warned the storm would be near Park Forest, Homewood, Matteson, Country Club Hills, Hazel Crest, Richton Park, Flossmoor and Olympia Fields.
The NWS warned flying debris could be dangerous to those caught without shelter, and mobile homes could be damaged or destroyed, with damage to roofs, windows and vehicles.
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Those in the path of the storm were urged to move to a basement or an interior room on the lowest floor of a sturdy building.
A Flash Flood Warning for southeastern Cook County and northeastern Will County also expired.
Some areas picked up over 2 inches of rain in about 30 minutes Tuesday, ABC7 Chicago meteorologist Larry Mowry said.