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atmospheric river

American  
[at-muhs-fer-ik riv-er, -feer-] / ˌæt məsˈfɛr ɪk ˈrɪv ər, -ˈfɪər- /

noun

Meteorology.
  1. a long, narrow corridor in the atmosphere that transports massive amounts of concentrated water vapor from the tropics: often responsible for extratropical cyclones and other extreme weather events, but also for commonly weaker systems of rain that replenish water supplies. AR


Etymology

Origin of atmospheric river

First recorded in 1990–95

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

By late April, temperatures had begun to rise, but reports indicated that unsettled, wet conditions were still on the way for Southcentral and Southeast Alaska as an atmospheric river approached.

From Science Daily May 6, 2026

After a dry start to the winter, the region has been battered with atmospheric river storms since Christmas, with accumulations of up to six feet on nearby summits.

From Los Angeles Times Jan. 6, 2026

California’s snowpack remains below average despite the powerful atmospheric river storms that pounded the West Coast around Christmas, state officials announced Tuesday.

From Los Angeles Times Dec. 30, 2025

Heavy rain from an atmospheric river system caused flooding and mudslides, particularly in areas still scarred by wildfires.

From Salon Dec. 27, 2025

The so-called Pineapple Express was forecast to be the strongest atmospheric river storm to hit Southern California in nearly two years, National Weather Service meteorologist Rose Schoenfeld said.

From Los Angeles Times Dec. 24, 2025

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