Monday, May 9, 2011

La Nina brings flood risks and drought to the West

SALT LAKE CITY – The winter and early spring have been extreme across the West, with record snowpacks bringing joy to skiers and urban water managers but severe flood risks to northern Utah, Wyoming and Montana. And despite all the wet weather in the Rockies and Sierra Nevada, parts of eastern Colorado, New Mexico and Arizona are in severe drought and gearing up for what is forecast as a bad fire season. In New Mexico, some 400 fires, driven by relentless winds, have already raced across 315,000 acres.Credit — or blame — for the extreme weather goes mostly to a strong La Nina, which is associated with cooler than normal water temperatures in the Equatorial Pacific Ocean and an atmospheric flow that's causing drier than normal conditions in the Southwest and wetter than normal in the Northwest..
"This winter has been fairly unusual," said Laura Edwards, a research climatologist at the Desert Research Institute in Reno, Nev., in what can only be considered an understatement.
Randy Julander, supervisor for the Utah Snow Survey, described more colorfully the disparity between the snow buried, flood endangered parts of the West and those that are parched and burning: "They're wishing they could get a little of what we have. (The wet weather) just continues to get worse. At this point, all you can do is open the chute, let her buck and hope your butt stays glued to the saddle."

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