Wednesday, September 2, 2015

Strong El Nino coming

There will be a strong El Nino this winter, peaking between October and January, say experts with the World Meteorological Organization in Geneva, Switzerland.

Climate models and experts suggest surface waters in the east-central Pacific Ocean are likely to be more than two degrees Celsius warming than average, potentially making this El Nino one of the strongest ever.

Typically, the warm air above the eastern Pacific is causing increased precipitation over the west coast of South America and dry conditions over the Australia/Indonesia archipelago and the Southeast Asia region, said Maxx Dilley, director of the WMO’s climate prediction and adaptation branch.

Even though they have better prediction models, climate scientists say it’s difficult to forecast the impact on Canada and the United States because there is also an arctic warming effect at work on the Atlantic jet stream current.

“The truth is we don’t know what will happen. Will the two patterns reinforce each other? Will they cancel each other? Are they going to act in sequence? Are they going to be regional? We really don’t know,” said David Carlson, the director of the World Climate Research Programme.

This El Nino could also be followed abruptly by a cooling La Nina, which, along with the advance of global warming, was adding to the uncertainty, Carlson said.

“I think we all think that there’s some climate warming signals starting to show up in the El Nino record,” he said.

But he added that it is still unclear how global warming has affected the frequency or magnitude of El Nino events.


Since 1950, strong El Nino events occurred in 1972-3, 1982-3 and 1997-8. For the Prairies and central Canada, El Nino is usually, but not always, linked to warmer and drier winters.