A steady dose of snow is expected throughout the day across the Chicago area, leaving four to eight inches on the ground.
The worst may come in the afternoon when drivers and rail passengers can expect a slow evening rush back home.
Metra already sent out a warning to its riders about delays due to weather-related conditions.
“Metra will continue to utilize all possible measures available to combat extraordinary weather conditions. Please allow extra travel time to assure your safe passage to and from your destination,” according to a statement.
Airlines have already canceled flights at both O’Hare International Airport and Midway Airport.
680 flights are canceled at O’Hare, and 200 are canceled at Midway. O’Hare is experiencing delays of about 45 minutes, while Midway has 2-hour delays.
The Chicago Department of Streets and Sanitation has deployed its full fleet of 287 snow plows and salt spreaders to main routes and Lake Shore Drive.