A line of fast-moving storms prompted severe thunderstorm warnings in the Chicago area and ground stops at O'Hare and Midway airports. There were also reports of storm damage.

The powerful storms also led to ground stops at O'Hare and Midway, and may have even played a role in a gas station explosion near Chicago.

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As of 12:30 p.m., heavy rain had already started to fall in some parts. A flash flood warning was in effect for DuPage and Cook County, the NWS said, with reports of "totally submerged viaducts and underpasses in the city of Chicago."

Flash flooding drowned streets and snarled traffic on Chicago's South Side amid sudden storms Friday afternoon.