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Message: <blockquote data-quote="argan" data-source="post: 9213669" data-attributes="member: 42318">The term La Niña refers to the extensive cooling of the central and eastern Pacific. The subsequent changes to the atmosphere and ocean circulation are as varied and diverse as those of the earlier El Niño event.Lower than normal temperatures across the central and eastern Pacific Ocean have important effects on the weather and in particular on rainfall amounts. Increased sea temperatures on the western side of the Pacific means that here the atmosphere has more energy and the frequency of heavy rain and thunderstorms is increased.La Niña is preceded by the build up of cooler than normal subsurface water in the tropical Pacific. Wave action and easterly winds will pull this colder water to the surface off the coast of Peru and Ecuador and as the easterly trade winds strengthen the effect becomes strongerTypically La Niña will last for up to 12 months and will be a generally less damaging event than the stronger El Niño, that is not to say that the global impact will not be as diverse.Globally La Niña, in very general terms, will mean that those parts of the world that normally experience dry weather will be drier and those with wet weather will be wetterExtracted from - <a href="http://www.bbc.co.uk/weather/features/understanding/la_nina.shtml" target="_blank">http://www.bbc.co.uk/weather/features/understanding/la_nina.shtml</a></blockquote>

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