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UN weather agency: El?Nino could return as soon as May and impact global weather patterns.

WMO said that the return of El Nino weather conditions is expected as early as this May, and could affect?global temperatures, and a?rainfall pattern.

El Nino, as defined by the WMO, is a periodic increase in sea surface temperature over the eastern and central Pacific Ocean. It typically lasts nine to twelve month.

It said that a clear'shift' has been observed, with sea surface?temperatures rapidly rising, indicating a high probability of El Nino developing between May and July.

Wilfran Moufouma OKia, WMO's Chief of Climate Prediction, said in a press release that "after a period neutral conditions, the climate models have 'now aligned strongly and there is high confidence on the onset El Nino followed by further intensity in the months to follow."

The WMO stated that while models suggest a strong El Nino this year, forecasts are less reliable during spring and a greater degree of confidence can be gained after April.

It is well known that the weather pattern can disrupt regional climates. It could?bring increased rainfall to southern South America and the?southern United States?, as well as parts of the Horn of Africa?and central Asia?, while causing droughts in Australia, Indonesia?and southern Asia?. The WMO also said that it can have an effect on global climate. (Reporting and editing by Kirstiknolle, Olivia Le Poidevin)

(source: Reuters)