Drought, a fixture in much of the West for nearly a decade, now covers more than one-third of the continental USA. And it's spreading.

As summer starts, half the nation is either abnormally dry or in outright drought from prolonged lack of rain that could lead to water shortages, according to the U.S. Drought Monitor, a weekly index of conditions. Welcome rainfall last weekend from Tropical Storm Barry brought short-term relief to parts of the fire-scorched Southeast. But up to 50 inches of rain is needed to end the drought there, and this is the driest spring in the Southeast since record-keeping began in 1895, according to the National Climatic Data Center.

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