Chicago is preparing for severe weather expected to arrive Tuesday afternoon, bringing with it a range of hazards including heavy rain, flash flooding, and powerful winds reaching up to 70 mph. The National Weather Service has cautioned that hail could be exceptionally large, potentially reaching two inches in diameter, with some areas possibly experiencing hail the size of tennis balls. Meteorologist Alicia Roman from NBC 5 Storm Team has emphasized the possibility of tornadoes, particularly in areas at enhanced risk. The tornado threat is anticipated to persist until at least 10 p.m., with the potential to extend into the night in northwest Indiana. Residents are advised to stay updated through local news and weather alerts, and to have a preparedness plan in place.