FILE - In this Aug. 8, 2012 file photo, dark clouds from a passing thunderstorm hang over a dry cornfield in Blair, Neb. In 2012, the nation suffered its worst drought since the 1950s, covering 80 percent of U.S. farmland. Grain and food prices soared. (AP Photo/Nati Harnik)

Associated Press
FILE - In this Aug. 8, 2012 file photo, dark clouds from a passing thunderstorm hang over a dry cornfield in Blair, Neb. In 2012, the nation suffered its worst drought since the 1950s, covering 80 percent of U.S. farmland. Grain and food prices soared. (AP Photo/Nati Harnik)
FILE - In this Aug. 8, 2012 file photo, dark clouds from a passing thunderstorm hang over a dry cornfield in Blair, Neb. In 2012, the nation suffered its worst drought since the 1950s, covering 80 percent of U.S. farmland. Grain and food prices soared. (AP Photo/Nati Harnik)
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