This phrase has been popularized of late. It refers to a weather system that is bringing lots of precipitation. It's like a river of water but in the sky or atmosphere. It's what we once referred to as a rain storm or rainy weather. An extended period of rain.
Citizens in western British Columbia are concerned about flooding due to an Atmospheric River heading towards the Province.
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A seemingly unending flow of diarrhea caused by ingesting contaminated water left untreated after raw sewage flowed from a water treatment plant that was knocked off-line by an atmospheric river.
Kent had an 3-day atmospheric river shit after he made Cincinnati stew at Marc's house during the atmospheric river.