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El Niño is a weather phenomena, the effes of which extend across a wide range. It tends to occur mainly in the tropical waters of the Pacific Ocean. It affects the region across the Pacific from New Guinea and Australia to South America.

Under normal conditions, in the tropics warm oceans tend to be accompanied by heavy rains, resulting in heavy rains in the warm west Pacific while the cooler east Pacific receives far less rainfall. This is reversed during an El Niño, when the ocean temperature gradient from one side of the Pacific to the other weakens. Warmer than usual ocean temperatures cause droughts across Australia, while the unusually warm eastern waters bring heavy rains and floods to the Pacific coast of South America, which is usually much drier.

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11y ago

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