Chicago residents are cleaning up after strong storms with hard rains caused flash flooding Friday, especially on the South Side.

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."

Torrential rains nearing 5 inches in just a few hours led to flash flooding across parts of Chicago on Friday afternoon, snarling both traffic on the ground and in the air.