The winter storm in effect could bring up to 12 inches of snow to northern IL, making one of the busiest travel days of the year even more hard.
Separately, a portion of Interstate 29 was shut down in Missouri, near the Iowa border.
The Coast Guard issued a warning Sunday afternoon, urging people to stay away from the shoreline and remain off nearby paths, as first responders will not be able to launch rescue crews due to the high waves.
But perhaps the biggest overall impact to air travelers was in Chicago, where more than 790 combined arrivals and departures had been canceled as of 10:20 p.m. ET at the city's busy O'Hare airport.
With much of the central plains and Great Lakes region under blizzard or winter storms warnings, some 1,040 flights headed to or from the USA had been canceled as of 5 p.m. Sunday, according to the flight-tracking website FlightAware.
A snow storm has created whiteout conditions across Kansas on Sunday, prompting blizzard warnings as it was projected to travel north through the Midwest and into New England this week, according to the National Weather Service.
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Parts of Northern Illinois have been upgraded to a Blizzard Warning. Around 3-6 inches of snow is expected to hit those counties.
Kansas Gov. Jeff Colyer declared a state of emergency. A swath of 10+ inch snowfall totals are expected, with locally higher amounts over a foot is possible-particularly in eastern Iowa/western IL.
Snow and blowing snow closed several roads in the area, including Interstate 70.
A good many drivers had already heeded weather warnings and headed home on Saturday, a day early, to avoid the storm. At least one of the crashes involved an injury, when a semitrailer truck struck another one that had jackknifed near Waverly.
ComEd reports 20,000 customers without power in the entire north region of IL, with the hardest-hit areas west of I-39 and in Streamwood, Palatine and Schaumburg.
By Monday morning, the storm was expected to hit parts of northern IN and southern MI.
Holiday travelers were facing delays and cancellations at both of Chicago's major airports as a winter storm moved into the area on Sunday. He said rain will give way to heavy snowfall and "near whiteout conditions" that would make for unsafe travel.