Parts of the Chicago area were inundated by nearly six inches of rain in mere hours overnight, causing flash flooding across the region.

A flash flood watch is in effect until midnight Wednesday in Cook, DuPage and Will counties, plus some parts of northwest Indiana, the National Weather Service said.

CBS News Meteorologist Kylee Miller says we still can't rule out having an isolated storm pop up during the afternoon.

Most of the Chicago area is at a “slight” risk of severe weather, with a severe thunderstorm watch issued Monday. Here's how things will unfold.

The National Weather Service has issued a flood watch in effect until 4 a.m. Tuesday. Residents are urged to reduce water use to ease pressure on the sewer system. City Council members on the Southwest Side call on the mayor to speed flood response.

The city announced the technology after heavy rain and storms damaged homes and left cars submerged on the South and Southwest Sides in July.

Flash flooding has causes devastation in recent months in Chicago and multiple aldermen are asking Mayor Brandon Johnson for financial help to assist families affected.

The National Weather Service (NWS) issued a flash flood warning for key parts of Chicago on Friday, urging approximately 600,000 residents to take immediate action to protect life and property.

Strong storms moving through the Chicago area on Monday could bring high winds, heavy rain and flash flooding.ABC7 Chicago is now streaming 24/7. Click here to watchA Severe Thunderstorm Warning is in effect for Cook,