Cars navigate along University Avenue during a dust storm in Lubbock, Texas, Wednesday, Dec. 19, 2012. (AP Photo/Lubbock Avalanche-Journal, Zach Long) ALL LOCAL TV OUT

Associated Press
Cars navigate along University Avenue during a dust storm in Lubbock, Texas, Wednesday, Dec. 19, 2012. (AP Photo/Lubbock Avalanche-Journal, Zach Long) ALL LOCAL TV OUT
Cars navigate along University Avenue during a dust storm in Lubbock, Texas, Wednesday, Dec. 19, 2012. (AP Photo/Lubbock Avalanche-Journal, Zach Long) ALL LOCAL TV OUT
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