The warning was in effect until approximately 7:15 p.m. Monday, according to an alert. Residents throughout the city reported hearing tornado sirens going off.
Fire department officials said the city's Office of Emergency Management and Communications activated the sirens and warned this was a «fast-moving storm.»
The warning was later cancelled. However, as of 7:28 p.m., more than 384 outages were reported across the region, affecting more than 56,000 customers, according to ComEd's online outage map.
The western suburbs were hit particularly hard, with approximately 19,000 people without power in an area including Maywood, Broadview, and Westchester.
People were very creeped out by the sound of the sirens. Many called the sirens an "apocalyptic" sound.