Chicago, Illinois – Drivers across northern Illinois may face flooded streets and rapidly rising water late Tuesday night as waves of thunderstorms move into the region with intense rainfall rates.
According to the National Weather Service in Chicago, storms developing late Tuesday and continuing through Wednesday could produce rainfall rates of 1 to 2 inches per hour, which may overwhelm drainage systems and trigger localized flooding. Forecasters say the highest probability for heavy rain currently sits along and south of Interstate 80.
Communities including Joliet, Kankakee, Pontiac, and Watseka could see the strongest storms. Heavy downpours may quickly pond water on roads such as I-80, I-57, and U.S. 45, creating hazardous driving conditions during overnight travel and the Wednesday morning commute.
Forecasters note that drought conditions remain more severe in Livingston, Ford, Iroquois, and Benton counties, meaning soils there may initially absorb rainfall more efficiently. Closer to the Chicago metropolitan area, flooding could occur with lower rainfall totals because of urban pavement and stormwater systems.
Residents are encouraged to clear storm drains, avoid driving through water-covered roads, and monitor forecast updates Tuesday evening. Officials say flood watches or warnings could still be issued as confidence in rainfall placement improves before storms arrive.
