what is the concept behind it?
Originally, the term "El Niño" applied to an annual weak warm ocean current that ran southwards along the coast of Peru and Ecuador at about Christmas time.
El Niño
Originally, the term "El Niño" applied to an annual weak warm ocean current that ran southwards along the coast of Peru and Ecuador at about Christmas time. 
what is the average winter temperature in pensacola florida Great Freeze of 1894-5* when did a recent thunderstorm happen? UNANSWERABLE what are the effects of climate cycles? El Niño brings above average rainfall in the spring and is followed by wildfire threat when rain dries up. what is the meaning of the first term? It is the warm phase of the El Niño–Southern Oscillation (ENSO) and is associated with a band of warm ocean water.
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El Niño [SEP] Concept
Originally, the term "El Niño" applied to an annual weak warm ocean current that ran southwards along the coast of Peru and Ecuador at about Christmas time. However, over time the term has evolved and now refers to the warm and negative phase of the El Niño–Southern Oscillation and is the warming of the ocean surface or above-average sea surface temperatures in the central and eastern tropical Pacific Ocean. This warming causes a shift in the atmospheric circulation with rainfall becoming reduced over Indonesia, India and Australia, while rainfall and tropical cyclone formation increases over the tropical Pacific Ocean. The low-level surface trade winds, which normally blow from east to west along the equator, either weaken or start blowing from the other direction.