Flash Flood Warning in Effect Until 2:30 a.m.

The National Weather Service has issued a flash flood watch for southern Cook County, according to its website. 

The watch, which expires at 2:30 a.m. Wednesday now includes most of central and northern Illinois. 

"Periods of showers and thunderstorms are likely tonight into Wednesday morning," the NWS said. "Due to the very moist airmass in place some of the thunderstorms could produce torrential rainfall with rates of over two inches per hour." 

The NWS reports that while the heaviest of rain ended around 9:23 p.m. Tuesday night, the speed at which it fell could create flooding issues.  

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