The severe weather poses significant risks, including flash flooding, power outages, and travel disruptions. As of Sunday evening, approximately 9,400 customers in Illinois and 9,000 in Indiana were without power. Ground stops were issued at O'Hare and Midway airports, causing major delays. Flooding has already impacted roads and neighborhoods, with emergency rescues reported in areas like Mundelein and Bridgeview. The risk of additional flooding and severe storms remains high, particularly in low-lying areas and near drainage systems.