Vehicles navigate along Interstate 27 during blizzard conditions in Lubbock, Texas, Monday, Feb. 25, 2013. State troopers are unable to respond to calls for assistance and National Guard units are mobilizing as a winter storm blankets the central Plains with a foot of snow in some places. Roads are closed Monday throughout West Texas and the Panhandle. (AP Photo/Lubbock Avalanche-Journal, Zach Long)

Associated Press
Vehicles navigate along Interstate 27 during blizzard conditions in Lubbock, Texas, Monday, Feb. 25, 2013. State troopers are unable to respond to calls for assistance and National Guard units are mobilizing as a winter storm blankets the central Plains with a foot of snow in some places. Roads are closed Monday throughout West Texas and the Panhandle. (AP Photo/Lubbock Avalanche-Journal, Zach Long)
Vehicles navigate along Interstate 27 during blizzard conditions in Lubbock, Texas, Monday, Feb. 25, 2013. State troopers are unable to respond to calls for assistance and National Guard units are mobilizing as a winter storm blankets the central Plains with a foot of snow in some places. Roads are closed Monday throughout West Texas and the Panhandle. (AP Photo/Lubbock Avalanche-Journal, Zach Long)
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