Overview

• The National Weather Service issued a severe thunderstorm watch for the Chicago area until 6 p.m., with warnings in Cook, DeKalb, DuPage and Kane valid to 5:30 p.m.
• Forecasters warned of wind gusts up to 70 mph, large hail, torrential rain and brief tornadoes, and kept a flood watch in place until 4 a.m. Tuesday.
• The Metropolitan Water Reclamation District declared an Overflow Action Day urging reduced water use, noting McCook Reservoir near 91% full with Thornton at 7% and Majewski empty.
• Storms disrupted travel as Metra halted Union Pacific Northwest trains between Jefferson Park and Cary and the FAA issued ground stops at O’Hare and Midway.
• ComEd said it restored service to about 99% of customers by late Monday afternoon, while Southwest Side alderpersons pressed the mayor to fund backflow valves estimated at $10,000–$15,000 per home.