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HELENA, Mont. — The drought plaguing eastern Montana and much of North and South Dakota came on quickly and is intensifying, leading ranchers to sell their cattle and farmers to harvest early whatever crops have grown so far this summer.

Just three months ago, no areas of moderate drought were recorded in the Northern Plains region by the U.S. Drought Monitor at the University of Nebraska-Lincoln. But July’s soaring temperatures and lack of rain quickly parched the soil and dried up waterways, creating what climatologists call a “flash drought.”

Now, 62 percent of North Dakota, more than half of South Dakota and 40 percent of Montana are in severe, extreme or exceptional drought, according to the drought monitor’s weekly report released Thursday. There are also pockets of drought in the Southern Plain states of Nebraska, Iowa, Oklahoma and Texas.

In Montana, 12 percent of the state’s land is experiencing “exceptional drought,” meaning widespread crop and pasture losses and water-shortage emergencies, mainly in the northeastern part of the state.

“We would expect to see conditions that bad once or twice in 100 years,” said Deborah Bathke, a climatologist at the University of Nebraska-Lincoln’s National Drought Mitigation Center and a co-author of the drought monitor.