Here we go again!
Originally posted on WGN-TV:
Many streets and viaducts were also flooded in the Chicago area, forcing some of them to close.
Traffic was jammed on area expressways because of standing water, but they started moving again around 10 p.m. when the rain diminished.
The National Weather Service estimated rain was falling at a rate of 1.5 to 2 inches per hour at one point — up to twice the rate that can trigger flash flooding in urban areas.