It's not winter yet, but the forecast for the Northeast and Midwest didn't get the memo.
A winter storm moving across the nation dumped up to 10 inches of snow, forcing the cancellation of more than 1,800 flights from Chicago to New York, USA Today reports. Many states are bracing for more as the storm moves east.
And the weather could get worse. A polar vortex -- a mix of high pressure and cold air near the North Pole -- is set to expand, which will lead to frigid temperatures across huge swaths of the country.
NFL teams dealt with the snow on Sunday. They didn't seem to have much of a problem.
Official Snow Totals though 6:00 PM:— NWS Chicago (@NWSChicago) December 5, 2016
O'Hare Airport: 6..1"
Rockford Airport: 5.3"
NWS Chicago/Romeoville: 8.1"
Midway Airport: 5.3"
Chicago's O'Hare Airport saw 1,200 flights cancelled.
One Delta flight in Detroit briefly skidded off the runway, CNN reports. Nobody was hurt.