Robert Miller, left, and J'Qwan Robinson help push a friend's car out of the snow Feb. 21, in St. Joseph, Mo.

Stalled vehicles are seen during a blizzard as traffic backs up on a major thoroughfare in Overland Park, Kan., on Feb. 21.

Tim Meece shovels a walk to help a friend Feb. 21 in Salina, Kan.

A man stands next to car stuck in the snow during a blizzard in Kansas City, Kan., on Feb. 21.

A car is stuck in a ditch after spinning out on Interstate 70 East near Lake St. Louis, Mo., Feb. 21.

An American Airlines flight arrives as sleet falls at Lambert-St. Louis International Airport, on Feb. 21.

Gina Pucket shovels snow from her driveway in Salina, Kan., on the morning of Feb. 21.

Snow flurries create a haze along Washington Street as winter weather sets in over Kinston, N.C., Feb. 16.

Orlando Nunez dismantles a greenhouse that collapsed under the weight of snow at Sunny Border Nurseries in the Kensington section of Berlin, Conn., Feb. 13, 2013. Five of the nursery's 16 greenhouses caved in after the heavy snowfall Friday and Saturday. Much of the damage in Connecticut was to the state's nursery and landscaping businesses, which account for more than $1 billion sales, or about half of all agriculture in the state.

U.S. Marines and South Korean Marine Corps soldiers perform in the snow during a winter exercise in Pyeongchang on Feb. 7, 2013.

A U.S. Marine uses a weapon during the drill on Feb. 7, 2013.

South Korean and U.S. Marines on skis during the drill on Feb. 7, 2013.

A South Korean Marine, right, and a U.S. Marine, left, take part in a mock cavalry battle during their joint military winter exercise on Feb. 7, 2013.

Firefighters spray down hot spots on an ice covered warehouse that caught fire Tuesday night in Chicago on Jan. 23. Fire department officials said it is the biggest fire the department has had to battle in years and one-third of all Chicago firefighters were on the scene at one point or another trying to put out the flames.

A truck is covered in ice as firefighters help to extinguish a massive blaze at a vacant warehouse on Jan. 23 in Chicago, Ill.

A firefighter helps to extinguish a massive blaze at a vacant warehouse on Jan. 23 in Chicago, Ill. More than 200 firefighters battled a five-alarm fire as temperatures were in the single digits.

Firefighters work to extinguish a massive blaze at a vacant warehouse on Jan. 23 in Chicago.