Overview

• The National Weather Service issued a flash flood warning for Cook and DuPage counties until 2:45 p.m. and flood watches through 6 p.m. for six other Illinois counties and Lake County, Indiana.
• Radar and automated gauges recorded up to 2.77 inches of rain with localized downpours topping 5 inches, submerging viaducts and underpasses across the city.
• Authorities urged roughly 600,000 residents in east-central Cook and southeastern DuPage counties to protect life and property as waters rose in low-lying neighborhoods.
• Flights at O’Hare averaged delays of about 60 minutes and at Midway about 45 minutes under FAA ground stops during the afternoon rush.
• Tornado sirens blared in Ottawa following reports of funnel clouds over LaSalle County.