High probability of thunderstorms across the Chicago area overnight

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated.

Update 11:40PM CDT…

Thunderstorms will spread into our area from the west, moving east-northeast. A few of the storms will carry heavy downpours that could produce localized flooding and gusty winds to 40-50 miles per hour. The runoff from rains passing over the same locations repeatedly overnight will probably end up causing rises  on area rivers and at least extending minor flooding already occurring on segments of the Kankakee and Illinois Rivers. ___________________________________________________________________________

Tonight between 11PM and 7AM CDT, the National Storm Prediction Center has included a good portion of northeast Illinois in a better than 70% chance of thunderstorms within 12 miles of a given location (see dark-red-shaded area on the highlighted map). The remainder of the Chicago area – generally to the south and east of Chicago is in a 40 to 70% chance of thunderstorms (light-blue-shaded area on the highlighted map).

Storms will be associated with a cold front as it moves south and east through our area – passing through the city of Chicago around 6AM CDT. Locally heavy rains, gusty winds and small hail could accompany some of the strongest storms.

Current Regional weather radar mosaic…

Central Great Lakes sector loop