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Colloquially known as "rivers in the sky", atmospheric rivers are fast-moving bands of moisture that supply the western U.S. with a large portion of its annual precipitation, but also sometimes cause devastating flooding. A new study has found that the El Niño-Southern Oscillation, which changes slowly and is usually predictable many months in advance, affects how frequently atmospheric rivers make landfall along the western U.S. coast. [Source: NOAA Climate Program Office]
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