Every 2-7 years and lasts about 18 months!
http://wiki.answers.com/Q/When_does_the_El_Nino_occur
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How often does El Niño occur? ... Would you be able to give me some feed back on how we as global citizens, can do something about El Niño and it's effects?; Why does El Niño occur?; How often does El Niño occur?; Where is a list of El ... ; El Niño Web Sites:; NOAA sites about El Niño; Non-NOAA sites about El Nino;
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www.pmel.noaa.gov/tao/elnino/faq.html
www.pmel.noaa.gov/tao/elnino/faq.html
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El Niños occur on a changing background state, which is probably the reason that the various El Niños are somewhat different. So it would not be simple to figure out how to modify the ... Q: How often does El Niño occur and how long does it last? ... Q: Why is there flooding in Peru and drought in Australia during El Nino?
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www.usatoday.com/weather/resources/askjack/wfaqnino.htm
www.usatoday.com/weather/resources/askjack/wfaqnino.htm
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EL NIÑO AND CLIMATE PREDICTION ... When the seesaw switches into its "low-index" (weakly tilted) state, as shown in the lower panel, the easterly surface winds weaken. The biggest changes in the slope of the seesaw and in the strength of the easterlies occur over the western Pacific.
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www.atmos.washington.edu/gcg/RTN/rtnt.html
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At the same time, the place where hefty thunderstorms occur on the equator moves eastward. Although those might seem like ... El Ninos often start with a Kelvin wave propagating from the western Pacific over towards South America. Perhaps you saw, on the TV news, the movie (produced by JPL) for the El Nino of 1997/98?
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meteora.ucsd.edu/~pierce/elnino/whatis.html
meteora.ucsd.edu/~pierce/elnino/whatis.html
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El Niño Effect ... TOP: Warm water (red) is associated with El Niño, cool water (blue) with La Niña. ... El Niño is a severe atmospheric and oceanic disturbance in the Pacific Ocean that occurs every seven to fourteen years. It is called El Niño, meaning “the Child”, because it usually appears near the Christmas season.
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www.pacificislandtravel.com/nature_gallery/elnino.htm
www.pacificislandtravel.com/nature_gallery/elnino.htm
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In what ocean do El Nino events occur? Why? ... Why does El Nino occur? How often does El Nino occur? What are some types of weather conditions that are affected by El Nino? What is thermocline? How long does the typical El Nino last?
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www.bobsedulinks.com/filamentality/huntanswerssh.html
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La Nina is essentially the opposite of El Nino. La Nina exists when cooler than usual ocean temperatures occur on the equator between South America and the Date Line. ... The terms El Viejo and anti-El Nino are also sometimes used. La Nina occurs almost as often as El Nino, but has been lesser known. La Nina and El Nino are...
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www.wrcc.dri.edu/enso/ensofaq.html
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For example, early (summer 1997) attempts at computer modeling of impacts of El Niño patterns on California precipitation did indeed produce a unified view that heavier than normal precipitation would occur, ... Any of these MAY occur as an impact of El Niño (or be associated with it coincidentally).
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tornado.sfsu.edu/geosciences/elnino/elnino.html
tornado.sfsu.edu/geosciences/elnino/elnino.html
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