Some early clues that winter has arrived;
http://apnews.myway.com/article/20071201/D8T8ULN00.html
Hundreds of flights were canceled at airports in Des Moines, Chicago and Milwaukee. Officials decided to close Des Moines International Airport for several hours after a United Airlines plane slid off a taxiway as it was heading to a runway for a flight to Chicago's O'Hare, said airport spokesman Roy Criss. He said none of the 44 passengers was injured and the airport reopened by mid-afternoon.
At Dane County Regional Airport in Madison, Wis., an incoming Mesa Airlines regional jet flying for United Express slid off the pavement after failing to make a turn onto a taxiway, but no injuries were reported among the 25 passengers.