Two-decade-long dry spell in the western U.S. is turning into one of the deepest megadroughts in the region in more than 1,200 years, a new study finds.
What’s happening is that a natural but moderate drought is being worsened by temperatures that are 2.9 degrees Fahrenheit hotter than the past and that suck moisture out of the ground, Williams said. It’s much like how clothes and plants dry faster in the warmth of indoors than they do outside, he said.
Climate scientist Clara Deser at the National Center for Atmospheric Research, who wasn’t part of the study, said while the research is good, she thinks the deep drought has to last another decade or so to qualify as a “megadrought.” “It’s still going on and it’s 21 years long,” Williams said. “This drought looks like one of the worst ones of the last millennium except for the fact that it hasn’t lasted as long.”
Although last year was wet, past megadroughts have had wet years and the recent rain and snow was not nearly enough to make up for the deep drought years before, Williams said.
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