Thousands of flights were delayed or canceled Monday as a major winter storm swept much of the U.S. The big picture: As a sprawling and intense storm traverses the country, it has brought snow and frigid temperatures, knocked out power, grounded travel and brought the nation's capital to a halt.

A major winter storm impacting the Midwest has moved to the Mid-Atlantic, causing travel disruptions. Airlines are offering travel waivers.

Bone-chilling cold and wind chills are expected, with temperatures dropping to 12 to 25 degrees below normal in some states.

Ronald Reagan Washington National Airport were canceled Monday morning, with up to 10 inches of snow predicted in the capital.