A winter storm moving across the Great Lakes that's forecast to drop about a foot of snow in some areas created treacherous driving conditions Friday, closed schools and forced the cancellation of hundreds of flights. The Detroit area was in line for 6 to 9 inches. Ten inches were reported in parts of northern IL and 8 inches in northern Indiana.
Ice and snow covered Chicago's expressways, where there were at least 25 crashes overnight, the Chicago Tribune reported.
About 1,050 USA flights were canceled, with about one in five flights into or out of Chicago and Detroit airports called off, according to FlightAware.com, which tracks airline traffic.
About 980 flights were canceled at Chicago's O'Hare International Airport and more than 300 flights were canceled at Midway, the Chicago Department of Aviation reported Friday morning.
Schools in Chicago and MI announced cancellations ahead of Winter Storm Mateo.
The Des Moines Register reported that three to seven inches of snow fell in northern Iowa Friday morning.
Meteorologist Heather Orow in Grand Rapids, Michigan, said Friday morning the storm is "generally going to be an issue for travel".
The Windy City has not seen this much snow at one time since 2011, when a storm dumped about 20 inches of snow so quickly that drivers had to abandon their cars along a major road.
Most of the snowfall should be east of our area by midday.
While the advisory does not include Livingston County, the Weather Service indicated in a separate advisory that conditions this afternoon could reach advisory criteria.
Four major USA airlines - Delta, United, Frontier and Southwest - issued weather waivers for passengers, allowing travelers to change their reservations without incurring fees.
The expectation of up to 12 inches around Chicago prompted officials to close the city's public schools to about 390,000 students on Friday. Schools across MI also cancelled classes.
The central and northern Rockies also will see heavy snow, the weather service said.