La Nina Winter

La Nina Winter

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Caption: El Nino and La Nina are opposite phases of a natural climate pattern across the tropical Pacific Ocean that swings back and forth every 3-7 years on average. El Nino and La Nina alternately warm and cool large areas of the tropical Pacific, which significantly influences where and how much it rains there. They disrupt the atmospheric circulation patterns that connect the tropics with the middle latitudes, which in turn modify the mid-latitude jet streams. ENSO can affect temperature and precipitation across the U.S. and other parts of the world. The influence on the U.S. is strongest during winter, but it lingers into the early spring. This map illustrates the typical impacts on U.S. winter weather. During El Nino, the southern tier of Alaska and the U.S. Pacific Northwest tend to be warmer than average, whereas the U.S. southern states, from California to the Carolinas, tends to be cooler and wetter. During La Nina, these deviations from the average.

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