The Midwest's first snowstorm of the season moved across the region Friday and Saturday, causing whiteout conditions and treacherous travel.
On Saturday alone, more than 275 arriving and departing flights were cancelled at Chicago O'Hare International Airport, according to FlightStats. Delays totaled more than 500 as of Saturday afternoon.
Snow buried Chicago's northern and western suburbs early in the day on Saturday followed by a band of lake-effect snow moving southward through the city.
The city's 'Plow Tracker' website reported that more than 200 plow trucks were on the road Saturday afternoon as intense snowfall continued.
"The snow that moved into the Great Lakes on Saturday first spread snow across the central Plains on Friday, near the border of South Dakota and Nebraska into Iowa," AccuWeather Meteorologist Kristina Pydynowski.
The heaviest swath of snow fell from southeastern South Dakota to northern Iowa and northern Illinois, Pydynowski said.
The Iowa Department of Transportation was advising against travel on numerous roads throughout the state Friday night.
In South Dakota, totals of over 16 inches were reported.