Heat rising from the ground causes optical distortions as a vehicle travels a gravel road near Mead, Neb., in this photo from July 31, 2012. The latest U.S. Drought Monitor survey shows an increase in extreme drought conditions in four Plains states but a slight decrease in the overall area of the lower 48 states experiencing some form of drought. (AP Photo/Nati Harnik)

Associated Press
Heat rising from the ground causes optical distortions as a vehicle travels a gravel road near Mead, Neb., in this photo from July 31, 2012. The latest U.S. Drought Monitor survey shows an increase in extreme drought conditions in four Plains states but a slight decrease in the overall area of the lower 48 states experiencing some form of drought. (AP Photo/Nati Harnik)
Heat rising from the ground causes optical distortions as a vehicle travels a gravel road near Mead, Neb., in this photo from July 31, 2012. The latest U.S. Drought Monitor survey shows an increase in extreme drought conditions in four Plains states but a slight decrease in the overall area of the lower 48 states experiencing some form of drought. (AP Photo/Nati Harnik)
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