Why El Niño is a climate wild card
The Decibel
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The Effects of El Nino on the Climate
El Nino is by far the most important climate pattern apart from the annual change of the seasons. It reflects the influence of the largest stretch of open water in the world, which is the Pacific Ocean. There's a sort of normal mode in which the Pacific works where you tend to have easterly winds blowing along the equator. That tends to make that part of the world very wet.
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