Chicago, Illinois – The Chicago area is under a heightened weather alert as severe thunderstorms capable of producing damaging winds, flash flooding, and hail are expected to move in between 2 and 10 p.m. Monday, threatening nearly 12 million people across northern Illinois.
According to the National Weather Service in Chicago, a Severe Thunderstorm Watch remains in effect until 6 p.m., but the most dangerous window spans through late evening. Storms will develop in waves, with the strongest cells packing wind gusts up to 70 mph, quarter-sized hail, and torrential rainfall that could quickly overwhelm drainage systems.
Urban flooding is a major concern across the city and southern suburbs, including areas like Oak Lawn, Orland Park, and Joliet, which are still waterlogged from recent heavy rains. Streets, viaducts, and low-lying intersections may flood within minutes of downpours. Drivers are urged to avoid underpasses and poorly drained roads, especially during the evening rush.
Severe wind potential also threatens power lines and trees. ComEd has advised customers to prepare for possible outages by charging devices and avoiding downed wires. Brief tornadoes are possible west of I-55, including areas near Rockford, DeKalb, and the I-88 corridor.
Preparedness is key: move valuables out of basements now, secure loose outdoor items, and clear storm drains if safe to do so. If flooding begins, seek higher ground and avoid walking or driving through water-covered roads.
This is a fast-developing situation. Additional warnings or watches may be issued with little notice. Stay weather-aware and monitor alerts through the evening.
