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Short-Lived La Niña Leaves Impacts Before Fading Away

WASHINGTON (AP) -- La Niña, we hardly knew ye.

U.S. weather forecasters said Thursday the cool flip side to the climate phenomenon El Niño has faded away.

The La Niña episode lasted only four months and was among the weakest and shortest on record, coming on the heels of one of the strongest El Niños, said Mike Halpert of the National Oceanic and Atmospheric Administration's Climate Prediction Center.

La Niña, a cooling of parts of the equatorial Pacific that changes weather patterns worldwide, often lasts a year or more, longer than El Niños. La Niña conditions were first detected in October and disappeared in January.

"Even though it was fairly weak and short-lived ... it did leave impacts," Halpert said, pointing to unusual cold in Alaska, western Canada and U.S. Northern Plains in December and January.

Strong La Niñas usually follow powerful El Niños, which didn't happen in this case, said University of Washington atmospheric scientist Mike Wallace.

Many computer models show an El Niño forming later this summer or fall, but NOAA isn't making a prediction yet, Halpert said.

If an El Niño returns quickly, it would be fairly unusual. Switching from El Niño to La Niña and back in less than three years has happened only once before in the 1960s, Halpert said.

La Niña's disappearance leaves the world in what is called a neutral condition, making it tougher for meteorologists to make seasonal or long-term forecasts.

"In the forecast game you like big signals," Wallace said.

Because of persistent warming, forecasters will continue to call for warmer than normal temperatures for much of the United States.

"You can't really go wrong if you are forecasting above-normal temperatures for a large part of the country because that's what you get," Halpert said.

© Copyright 2017 The Associated Press. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed.

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