Airlines also have cancelled hundreds of flights at O'Hare and Midway airports.
Be prepared for significant reductions in visibility at times.PRECAUTIONARY/PREPAREDNESS ACTIONS.A Winter Storm Warning for snow means severe winter weather conditions will make travel very hazardous or impossible.
The storm is expected to continue bringing snow into Northern Pennsylvania, Upstate New York, Eastern Iowa, the Northern Rockies, Montana, Wyoming, Western South Dakota, and Nebraska throughout Friday night, making for tricky Saturday morning commutes in Chicago, Milwaukee, Detroit, Cleveland, and Buffalo, according to the Weather Channel's forecast.
Midday Sunday, light snow will taper off and by the end of the weekend - parts of Chicago area could see a total of more than a foot of snow on the ground over the week, including 1-3 inches of accumulation from the snowfall late Tuesday night into Wednesday, according to the news outlet.
"Our city is tackling the first major snow storm we have seen in several years - and it's clear that Chicagoans are rising to the challenge", Mayor Rahm Emanuel said. Chicago Public Schools canceled classes Friday. Eight inches was reported in parts of northern IL and up to about 6 inches was reported the Chicago area. More than 200 flights were canceled at Detroit Metropolitan Airport.
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While it isn't too bad the most major delays seem to be flights to Ohio, Illinois especially flights to Chicago and to cities in MI like Kalamazoo, Lansing and Alpena.
Early Friday, the National Weather Service received reports of 4 inches (10 centimeters) of snow in northern IL.
Ice and snow covered Chicago's expressways, where there were at least 25 crashes overnight, the Chicago Tribune reported.
American, United and Southwest airlines warned travelers to expect more flight cancellations to and from Minnesota, Michigan, Wisconsin, Illinois, Indiana and Ohio.
The National Weather Service issued winter-weather warnings and advisories across the upper Midwest. Schools across MI also cancelled classes.