Here comes El Nino; good news for U.S. weather woes

WASHINGTON — Relief may be on the way for a weather-weary United States with the predicted warming of the central Pacific Ocean brewing this year that will likely change weather worldwide. But it won’t be for the better everywhere.

The warming, called an El Nino, is expected to lead to fewer Atlantic hurricanes and more rain next winter for drought-stricken California and southern states, and even a milder winter for the nation’s frigid northern tier next year, meteorologists say.

While it could be good news to lessen the southwestern U.S. drought and shrink heating bills next winter in the far north, “worldwide it can be quite a different story,” said North Carolina State University atmospheric sciences professor Ken Kunkel. “Some areas benefit. Some don’t.”

Globally, it can mean an even hotter year coming up and billions of dollars in losses for food crops.

The National Oceanic Atmospheric and Administration issued an official El Nino watch Thursday. An El Nino is a warming of the central Pacific once every few years, from a combination of wind and waves in the tropics. It shakes up climate around the world, changing rain and temperature patterns.

Mike Halpert, acting director of NOAA’s Climate Prediction Center, says the El Nino warming should develop by this summer, but that there are no guarantees. Although early signs are appearing already a few hundred feet below the ocean surface, meteorologists say an El Nino started to brew in 2012 and then shut down suddenly and unexpectedly.

The flip side of El Nino is called a La Nina, which has a general cooling effect. It has been much more frequent than El Ninos lately, with five La Ninas and two small-to-moderate El Ninos in the past nine years. The last big El Nino was 1997-1998. Neither has appeared since mid-2012. El Ninos are usually strongest from December to April.

Kevin Trenberth, a senior scientist at the National Center for Atmospheric Research, who wasn’t part of NOAA’s forecast, agreed that an El Nino is brewing.

“This could be a substantial event and I think we’re due,” Trenberth said. “And I think it could have major consequences.”

Halpert said it is too early to say how strong this El Nino will be. The last four have been weak or moderate and those have fewer effects on weather.

Scientific studies have tied El Ninos to farming and fishing problems and to upticks in insect-born disease, such as malaria. Commodity traders even track El Nino cycles. A study by Texas A&M University economics professor Bruce McCarl found the last big El Nino of 1997-1998 cost about $3 billion in agricultural damage.

Trenberth said this El Nino may even push the globe out of a decade-long slowdown in temperature increase, “so suddenly global warming kicks into a whole new level.”

Kunkel said if this El Nino is a strong one, global temperatures, probably in 2015, could “be in near record breaking territory.”

Halpert, however, says El Ninos can be beneficial, and that the one being forecast is “a perfect case.”

After years of dryness and low reservoirs, an El Nino’s wet weather would be welcome in places like California, Halpert said.

“If they get too much rain, I think they’d rather have that situation rather than another year of drought,” Halpert said. “Sometimes you have to pick your poison.”

Australia and South Africa should be dry while parts of South America become dry and parts become wet in an El Nino. Peru suffers the most, getting floods and poorer fishing.

The climate event got the name El Nino, meaning the boy in Spanish, when it was first noticed off the coast of Peru and Ecuador around Christmas time and was named after Christ child, according to Trenberth.

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