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When does an El Niño occur?

Updated: 8/10/2023
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10y ago

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Some investigators have suggested that El Nino began around 2300 BC. The evidence for this is to do with a 500-mile northward shift of the two currents whose boundaries mark the ENSO phenomenon. See Rollins, Richardson, and Sandweiss: the Birth of El Nino; Geo-archaeological evidence and implications, for instance. It certainly seems to be the case that many of the weather and tidal patterns we associaite with El Nino began at about this time.

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12y ago
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10y ago

It is and infrequent but recurrent weather pattern that develops over the Pacific Ocean. When it happens warm waters accumulates along the western seaboard of the Americas rather then the normal cold waters. We can see this beginning to happen at the start of an El Nino and therefore predict when the effect will peak.

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12y ago

The begin in the eastern Tropical Pacific Ocean.

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11y ago

About every four to five years

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