A winter storm system is expected to intensify Saturday morning, bringing steady snow showers and creating potentially hazardous travel conditions across Illinois, Missouri, Iowa, Wisconsin and Michigan.

Travelers face challenging weather for the rest of the Thanksgiving holiday weekend. Winter storm warnings have been issued across the northern United States, with snow expected from Montana to New York.

On Saturday at 2:13 p.m. EST the National Weather Service issued an updated winter storm warning valid from 4 p.m. EST until Sunday 1 p.m. EST for Alcona, Ogemaw, Iosco, Gladwin and Arenac counties.

More than 100 flights were cancelled and over 785 were delayed out of Chicago O'Hare International Airport Saturday morning, according to Flightaware.com. The National Weather Service (NWS) issued multiple advisories for the Chicago region, including a winter storm warning, gale warning, and hazardous weather outlook.

A winter storm warning remains in effect for all of southern Wisconsin until 6 a.m. Nov. 30. The storm could bring snowfall totals anywhere from eight to 12 inches, according to the National Weather Service. Totals of 14 inches and above are also possible near the Kettle Moraine area and south of Interstate 94/U.S. 18.

A winter storm could bring 8 to 12 inches of snow to southern Wisconsin. For those without shelter, there are six warming centers across the city.

Photographs from state traffic cameras show widespread wreckage, with many vehicles scattered across and off the highway.

A winter weather advisory was released by the National Weather Service on Saturday at 1:25 p.m. valid for Sunday between 3 a.m. and noon for Westmoreland Ridges and Fayette Ridges.