Tuesday, May 18, 2010

Adios El Niño!; Hola La Niña?

The Pacific Ocean bids farewell to El Niño:
The El Niño event of 2009/10 has concluded, with all the major indicators now below El Niño thresholds. Latest observations show that sea surface temperatures, trade winds, the Southern Oscillation Index and cloudiness over the Pacific have all returned to levels considered typical of neutral (i.e. neither El Niño nor La Niña) conditions. The timing of the decline in the 2009/10 El Niño event has been fairly typical, with the event peaking over summer then decaying during autumn.

Historically, about 40% of El Niño events are immediately followed by a La Niña. Current conditions below the surface of the Pacific Ocean show large volumes of cooler than normal water, indicating that further cooling of the surface is likely.

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