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      • El Niño intensifying, could rival strongest in recorded history

      BACKCOUNTRY NEWS AND FORUMS

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      El Niño intensifying, could rival strongest in recorded history

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      • skifreak
        2015-09-15 11:24:57

        El Niño intensifying, could rival strongest in recorded history

        Yet more evidence that this winter's predicted El Niño could be a big one,... or will it? What's your vote on what's to come for this winter?

        Strong Elnino


        The following is from the Washington Post:

        The present El Niño event, on the cusp of attaining “strong” intensity, has a chance to become the most powerful on record.

        The event — defined by the expanding, deepening pool of warmer-than-normal ocean water in the tropical Pacific — has steadily grown stronger since the spring.

        The presence of a strong El Niño almost ensures that 2015 will become the warmest on record for Earth and will have ripple effects on weather patterns all over the world.

        A strong El Niño event would likely lead to enhanced rainfall in California this fall and winter, a quieter than normal Atlantic hurricane season, a warmer than normal winter over large parts of the U.S., and a very active hurricane and typhoon season in the Pacific.

        Some of these El Niño-related effects have already manifested themselves and, over the U.S., will become particularly apparent by the fall and winter.

        Frequent and persistent bursts of wind from the west, counter to the prevailing easterly direction, have helped this year’s El Niño sustain itself and grow. Warm water from the western Pacific has sloshed eastward, piling up in the central and eastern part of the basin.

        The sprawling area of warm waters has proven to be a boon for Pacific tropical cyclone activity, near record levels through mid-summer. Through a positive feedback mechanism, these cyclones have likely helped to reinforce the westerly push of warm waters, Slate’s Eric Holthaus reported.

        The 2015 El Niño event is now neck-and-neck with record-setting event of 1997-1998 in terms of its mid-summer intensity.

         Strong Elnino

        Chart shows sea surface temperature difference from average (in degrees Celsius) in central and eastern Tropical Pacific in 2015 (orange line) compared to 1997 (blue line).  By definition, El Nino becomes established when the sea surface temperature difference from average in this region is 0.5 Celsius for at least one month.  It becomes a moderate El Nino event at 1 degree Celsius, strong at 1.5 degrees, and very strong or “super” at 2 degrees.  In mid-July 2015, the sea surface temperature difference from normal was around 1.5 degrees, on the cusp of a strong El Nino event and comparable to the 1997 event at the same time, which eventually became a super El Nino.  The red dots represent the average model forecast for the rest of 2015 which shows the sea surface temperature difference from average climbing above 2 degrees, achieving super El Nino strength, but it is not forecast to be quite as strong as the 1997-1998 event . (Jan Null)

         

        Michael Ventrice, a meteorologist for the Weather Company, said the atmospheric footprint of this year’s event — given the time of year — is statistically extremely rare and has a less than one in 1,000 chance of occurrence.

        Although the El Niño is still officially classified as a “moderate” strength event, Tony Barnston, one of the world’s leading El Niño experts, explained it could well become a “strong” event by the end of the month.

        “The strength of the departure from normal sea surface temperatures was enough to call it a strong event for just last week,” Barnston, of Columbia’s International Research Institute for Climate and Society (IRI), said. “But to call it an officially strong event, we need for it to stay at that level or higher for a full month. And the average for July could make it.”

        “[El Niño] is growing and the prediction models say it’s going to get stronger,” Barnston said. “And that’s our prediction, that it will become a strong event, most likely.”

        A few models, notably the European model and the National Weather Service CFS model, point to the possibility of a near-record event in which a very strong or “super” El Niño develops.

        The only two super (or very strong) El Ninos in the historic record occurred in 1982-83 and 1997-98.

        Perhaps hinting at an El Niño rivaling history, models have been trending stronger with their forecast month after month after month — as they absorb more data reflecting the true state of the current event and how it’s evolving.

        While some models show El Niño possibly maxing out in record territory, NOAA climate analyst Michelle L’Heureux expressed some skepticism about such projections in an interview with Mashable’s Andrew Freedman. “L’Heureux noted that none of the major forecasting centers responsible for monitoring El Nino are predicting a record event at this time,” Freedman reported.

        NOAA says the “forecaster consensus” is for a strong event but doesn’t specify how strong. Its forecast calls for El Niño to persist through the winter (90 percent chance) and early spring (80 percent chance).



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