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Created page with "== Introduction == Atmospheric rivers (ARs) are relatively narrow regions in the atmosphere that are responsible for transporting most of the water vapor outside of the tropics. These corridors of intense moisture transport are typically thousands of kilometers long and only a few hundred kilometers wide, and a strong AR can carry an amount of water vapor roughly equivalent to 7.5–15 times the average flow of liquid water at the mouth of the Mississippi River. ARs..."