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During an El Niño year, tropical rains usually centered over Indonesia shift eastward, influencing atmospheric wind patterns world wide. Possible impacts include: a shifting of the jet stream, storm tracks and monsoons, producing unseasonable weather over many regions of the globe. During the El Niño event of 1982-1983, some of the abnormal weather patterns observed included:.
The 1982-83 El Niño strengthened the upper-level ridge that was present off the West coast of the United States. (This intensification is represented by the increased amplitude of the wave in the right panel below).
The amplification led to a warming in the near-Pacific regions of North America, extending from Alaska to the northern Plains of the United States (orange shading).
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