Chicago and all of suburban Cook County is under a winter storm warning from Monday, February 15 at 3 AM until Tuesday at noon.
The National Weather Service issued the warning on Sunday night. Expect dangerous travel, low visibility, heavy snow, and cold temperatures with wind chills near 20 degrees below zero. At that temperature, frostbite can set in within a half hour.
Total snow accumulation of 8 to 12 inches is expected from the storm. However, the NWS advises that local amounts may be higher. They warn that travel will be “very difficult to impossible” with the worst conditions late Monday afternoon into Tuesday morning.
“The coldest temperatures are expected tonight into Monday morning. Conditions will deteriorate more notably towards Monday evening and overnight. Roadway conditions may vary considerably over a short distance,” the National Weather Service adds.
[10:00 PM 2/14] A complicated forecast to communicate over the next 36+ hours w/ multiple waves of snow & lake-enhancement. We've attempted to pare the forecast timeline down into smaller regions in this graphic. End result: travel will become very challenging Mon. into Tues. pic.twitter.com/7WBNsNybXm— NWS Chicago (@NWSChicago) February 15, 2021