Deep cracks cover the bottom of what should be five-feet deep Lake Okeechobee near Okeechobee, Fla. in early May. On June 1, the lake broke a record for its all-time low water level.

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.

California and Nevada just recorded their driest June-to-May period since 1924, and a lack of rain in the West could make this an especially risky summer for wildfires.

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