Heavy rainfall moving across northern Illinois has prompted the National Weather Service to issue a flash flood watch and warning for multiple counties through Friday morning. According to forecasters, localized rainfall rates may exceed 2 inches per hour, increasing the risk of inundation in poor drainage areas and low-lying roadways near and south of Interstate 80.
Flash Flood Watch and Warning Details
The National Weather Service issued warnings and watches covering several counties across northern Illinois and northwest Indiana. According to Shaw Local, the affected Illinois counties include DeKalb, Ford, Grundy, Iroquois, Kankakee, Kendall, La Salle, Lee, Livingston, Ogle, and Will. In northwest Indiana, Benton, Jasper, and Newton counties are also included under the alerts.
Forecasters report that portions of the watch area received between 2 and 4 inches of rain over the previous few days. Because the ground is already saturated, these regions remain highly susceptible to rapid flooding from additional heavy downpours. The weather service notes that forecast confidence is highest generally along and south of Interstate 80.
Precipitation Forecast and Impacts
Scattered showers and embedded thunderstorms are tracking across the region, bringing persistent heavy rain through the end of the week. According to the National Weather Service, torrential rainfall will likely cause ponding on roadways, urban flooding in poor drainage locations, and notable rises in local streams.
Daily opportunities for thunderstorms are expected to continue in the forecast throughout the weekend, requiring residents in the affected zones to monitor updated weather advisories.
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