What is an atmospheric river, responsible for the heavy rainfall on the West Coast?

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What is an atmospheric river, responsible for the heavy rainfall on the West Coast?
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An atmospheric river is forecasted to bring days of rain and heavy winds to the West Coast. Here’s an explanation of what the meteorological phenomenon is.

much of the eastern part of the United States begins to let up, a meteorological phenomenon known as an atmospheric river is forecast to bring days of rain and heavy winds to the West.is a relatively narrow channel of wind, hence the"river," that transports water vapor from the tropics to the West Coast. Powerful rivers that arrive at just the right angle of the coast can carry all the way to the Sierra Nevada.

"[Atmospheric rivers are] actually responsible for a good majority of the rainfall during the colder season which is the season when [the West Coast] gets most of the rain," National Weather Service senior forecaster Bob Oravec told

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