There may be flash floods in Cook County

Cook County is under a flash flood warning until 3 p.m. Sunday, according to the National Weather Service.

The warning took effect at 11:54 a.m., when a Doppler radar detected thunderstorms in southeastern Cook County and central Will County. According to the Weather Services website, 2.5 inches of rain had already fallen at that time and 1 to 2 inches more rain was forecast.

“The flash floods continue or are expected to start soon,” the warning said.

According to forecasters, Oak Forest, Frankfort, Dalton, Chicago Heights, Tinley Park and Homewood municipalities were under flood alert.

In a post on Twitter on Sunday morning, the weather service said “multiple rounds of storms” increased the risk of flash floods, as rainfall rates of 2 to 3 inches per hour were expected. It said small creeks and drains, urban areas, highways, roads and low-lying areas were particularly vulnerable.

“I think the main message would be that if you see any flooding on the roadways, turn around and don’t drive through it,” said Jake Petr, a meteorologist with the Weather Service’s Romeoville office.

Rain was moving east in northern and northwestern Illinois at noon, with the potential for some lightning.

This is a developing story, check back for updates. For more detailed forecast information, see Tribune’s weather page.

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