Dangerous weather hits Midwest

Covered in steadily falling snow, Colman Devine makes his way home from an overnight work shift in Madison, Wis., Dec. 20, 2012. The first major snowstorm of the season began its slow eastward march across the Midwest, creating treacherous driving conditions and threatening to disrupt some of the nation's busiest airports ahead of the holiday weekend.

Credit: AP Photo/Wisconsin State Journal, John Hart