Residents in northern Illinois, including Chicago, face significant risks from severe thunderstorms. Wind gusts of 75-80 mph or higher could cause widespread damage to trees, power lines, and structures. Heavy rainfall may exacerbate flooding in areas already saturated from previous storms, impacting streams, creeks, and roadways. While the risk of tornadoes is low, it cannot be ruled out entirely. The severe weather threat extends into Wednesday and Thursday, with potential for additional storms and localized hazards.