Scientific American reports that "the worst drought to hit the United States in a half century expanded in the upper Midwest and northern Plains states in the past week due to warmer- and drier-than-normal weather, but loosened its grip on some central and southern areas of the country. Nearly 65 percent of the contiguous United States were under at least "moderate" drought as of September 18, up from about 64 percent a week earlier, according to the Drought Monitor, a weekly compilation of data gathered by federal and academic scientists. However, the portion of the country under "exceptional" drought - the most dire classification - declined slightly to 5.96 percent from 6.23 percent a week earlier".
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