Flash flood warnings in effect throughout suburbs
Flash flood warnings are in effect through the suburbs.
A warning remains in effect in northern Cook, Lake, DeKalb, McHenry and northern Kane counties until 6:30 a.m., the National Weather Service says.
And a warning is in effect until 7:30 a.m. in southern Cook and northeastern DuPage counties.
The National Weather Service says the worst of the storms has moved southeast, estimating that "between 3 and 4 inches of rain had fallen over a large area from southern McHenry and southern Lake counties into northern Cook counties."
More rain was not expected overnight, but "runoff from the heavy rain that has already fallen will continue through the early morning hours with flash flooding still possible, especially in areas that received heavy rain Friday morning."
Flooding has been seen in Arlington Heights and Schaumburg, and is being reported throughout the area, including Chicago, where the Ohio Street ramp to Interstate 94 was closed, the weather service said.
The service reports 5.53 inches of rain had been measured at O'Hare International Airport between 12:51 a.m. and 2:51 a.m.
ComEd reported on its website at 3 a.m.: "A severe thunderstorm is moving through the ComEd electric system, causing power outages to thousands of our customers. We are working to assess damage as quickly and safely as possible."
Heat advisories have been issued for this weekend, with temperatures reaching into the 90s again and heat indexes into the 100s.