El Niño/La Niña Update (September 2011)

Neutral conditions have prevailed over the tropical Pacific, following the dissipation 

of the 2010-11 La Niña event by early May 2011. However, a few weak remnants of 

La Niña have persisted, particularly in some atmospheric features, and in recent 

weeks the surface as well as sub-surface waters in the eastern and central tropical 

Pacific Ocean have also cooled. Model forecasts and expert interpretation suggest 

persistence of near-neutral conditions or the re-emergence of La Niña conditions.