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The top of Willis Tower peeks through fog blanketing downtown Chicago after steady rain came to an end, April 27, 2026. (Terrence Antonio James/Chicago Tribune)
The top of Willis Tower peeks through fog blanketing downtown Chicago after steady rain came to an end, April 27, 2026. (Terrence Antonio James/Chicago Tribune)
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Weather officials warned of potentially severe thunderstorms that could bring tornadoes, strong winds and hail to several Illinois counties Monday.

According to the National Weather Service, the greatest risk for tornadoes is south of the Kankakee and Illinois River valleys.

Weaker storms are expected to bring rainfall during the late morning, with a higher risk of severe thunderstorms occurring this afternoon and evening. Storms have the potential to bring up to 70 mph winds and quarter sized hail, weather officials said.

In Chicago, showers are expected before noon, with stronger storms rolling in between noon and 3 p.m. Weather officials warn of wind gusts up to 40 mph.

The greatest risk for severe thunderstorms this afternoon is south of Interstate 80, but officials warn the threat could shift if the warm front drifts further north than currently expected.

Today’s rainfall could cause localized flooding and renewed rises to local area rivers, according to weather officials.

Last week, McHenry county residents walled off their homes in preparation for the Fox River to crest. Water levels have been receding in the Des Plaines River since they peaked earlier this month.