Residents in Cook, DeKalb, DuPage, Grundy, Kane, Kankakee, Kendall, Lake, LaSalle, McHenry, and Will counties in Illinois, as well as Jasper, Lake, Newton, and Porter counties in northwest Indiana, are at risk. The storms pose threats of heavy rainfall, localized flooding, strong winds, hail, and potential tornadoes. A confirmed tornado has already caused damage in Kankakee County. The risk level is categorized as 'slight,' but all severe weather hazards remain possible. Residents should remain vigilant, especially in areas under active warnings.