A winter storm system is seen over Canada and the eastern United States in this March 5, 2013 satellite image courtesy of NOAA. The late winter storm dumped heavy snow on the midwestern United States on Tuesday, contributing to numerous highway crashes and flight cancellations as it moved east toward the Ohio Valley and the mid-Atlantic states. (Photo by Reuters/NOAA)

A bicycle is covered in snow on March 5, 2013 in Chicago, Illinois. The worst winter storm of the season is expected to dump 7-10 inches of snow on the Chicago area with the worst expected for the evening commute. (Photo by Brian Kersey/AFP Photo)

Lindsay Knutson plays in the heavy snow with her family dog, Aspen, and daughter Flora Bejblik, 4, cq, as her husband Bob Bejblik, rear left, shovels, Tuesday, March 5, 2013 in southwest Minneapolis. The National Weather Service predicted a two-day snow total of 8 to 12 inches for much of southeastern and east-central Minnesota, including the Twin Cities. (Photo by Elizabeth Flores/AP Photo/The Star Tribune)

A woman walks by the Cloud Gate Sculpture, known as “The Bean”, as a snow plow clears the area during a snowstorm in Chicago March 5, 2013. A deadly late winter storm dumped heavy snow on the Midwestern United States on Tuesday, contributing to numerous highway crashes and flight cancellations as it moved east toward the Ohio Valley and the mid-Atlantic states. (Photo by Jim Young/Reuters)

Mike Davis clears snow from the Millennium Park skating rink on March 5, 2013 in Chicago, Illinois. The worst winter storm of the season is expected to dump 7-10 inches of snow on the Chicago area with the worst expected for the evening commute. (Photo by Brian Kersey/AFP Photo)

This frame grab provided by WEAU-TV shows a semi that authorities say slipped off a snow-covered road and plunged into the Red Cedar River Tuesday, March 5, 2013 near Menomonie, Wis. Police says a body believed to be the driver has been recovered from the river and emergency crews are searching for a second person. (Photo by AP Photo/Courtesy WEAU-TV)

A couple takes pictures of an LED display on 50-ft tall glass towers, projecting images of faces in Crown Plaza during snow in Chicago March 5, 2013. A deadly late winter storm dumped heavy snow on the Midwestern United States on Tuesday, contributing to numerous highway crashes and flight cancellations as it moved east toward the Ohio Valley and the mid-Atlantic states. (Photo by Jim Young/Reuters)

A woman walks along a street during a snowstorm in Chicago March 5, 2013. A deadly late winter storm dumped heavy snow on the Midwestern United States on Tuesday, contributing to numerous highway crashes and flight cancellations as it moved east toward the Ohio Valley and the mid-Atlantic states. (Photo by Jim Young/Reuters)

Snow covers the cars parked in the parking lots at O'Hare International Airport in Chicago, Wednesday, February 27, 2013. The storm that socked the Chicago area with the season's biggest snowfall has tapered off, but it's not completely finished. Snow will continue falling periodically today, dropping another inch or two in the city and up to three inches in the northern suburbs, according to the National Weather Service. (Photo by Nam Y. Huh/AP Photo)

John Baer of Elgin, Ill. finishes shoveling half of his driveway on Wing Park Ave. during a snow storm in the suburbs of Chicago, Ill. on Tuesday, March 5, 2013. (Photo by Daily Herald, Brian Hill/AP Photo)

Workers remove snow from cars at an auto dealership in Bloomington, Minnesota, from a storm that is crawling east from the Dakotas and Minnesota toward Chicago which could bring up to 10 inches of snow in some areas, on March 5, 2013. (Photo by Jim Mone/Associated Press)

Bill Groves plays with his dog Red while shovelling snow during a massive blizzard near Mt. Jackson, Virginia March 6, 2013. Washington and its suburbs face what could be their heaviest snowfall in two years on Wednesday, as a fierce storm headed east after blanketing the Midwestern United States, snarling traffic and causing hundreds of flight cancellations. (Photo by Gary Cameron/Reuters)