Early Friday morning, torrential rain fell across Cook County. Multiple crashes were reported on Chicago roads and highways and thousands were left without power across the Chicago area.

A tornado watch has been issued until 11 p.m. Friday for Cook County and most of northern Illinois. Strong storms are expected to hit the Chicago area between 8 p.m. and midnight, the National Weather Service said.

Most of Chicago will see temps in the mid-80s with lower 80s near the lake and northwest suburbs. Much of the city cleared out nicely after overnight showers and storms. Although there was still lingering cloud cover early Saturday morning, the city should be rain-free for the most part.

In parts of Chicago, flash flood alerts rang Tuesday, warning of dangerous conditions as cars were stranded and submerged on highways and water rescues were conducted, but how much rain actually fell across the region and how fast did it all happen?

Severe thunderstorm warnings popped off in the greater Chicago area through the evening Thursday, forcing the evacuation of tens of thousands of people from the Windy City Smokeout.

More than a month's worth of rain fell on Chicago in 90 minutes on Tuesday evening, according to the National Weather Service (NWS). "There were numerous reports of flooded viaducts, several reports of water rescues, and a few reports of flooded basements," the NWS said.

Snow seasons in Chicago are tracked from July through the following June. The area normally can expect 38.4 inches.

The National Weather Service is warning of an ongoing threat for flash flooding in the Chicago region through Saturday.

Chicago faced a stormy weekend with severe weather threats, including hail and gusty winds, according to forecasts.

Friday, temperatures are expected to reach the mid 80s with a 40 percent chance of heavy rain. Saturday, the chance of thunderstorms is 50 percent with highs in the upper 80s.

A number of weather alerts were issued for portions of the Chicago area on Thursday evening as thunderstorms trekked across the region.