An atmospheric river is a narrow corridor or filament of concentrated moisture in the atmosphere. Other names for this phenomenon are tropical plume, tropical connection, moisture plume, water vapor surge, and cloud band.

Quotes

• The intense rainstorms sweeping in from the Pacific Ocean began to pound central California on Christmas Eve in 1861 and continued virtually unabated for 43 days.
  • Michael D. Dettinger research hydrologist for the U.S. geological Survey and and B. Lynn Ingram, professor of earth and planetary science at the University of California, Berkeley [ https://cw3e.ucsd.edu/wp-content/uploads/2013/10/Dettinger_Ingram_sciam13.pdf Huge flows of vapor in the atmosphere, dubbed “atmospheric rivers,” have unleashed massive floods every 200 years, and climate change could bring more of them] (2013-10)

• What’s not normal is to have atmospheric river events that are this large. [in terms of rainfall these events] are nearly equaling the historic record.
  • Alex Hall, a professor of atmospheric science at U.C.L.A. Vancouver Is Marooned by Flooding and Besieged Again by Climate Change (Nov. 21, 2021)

• Warmer atmospheric temperatures, in general, will mean the freezing levels are higher than they've been in the past. But while storms vary, even without climate change and some can be extra warm, just by natural situation, it's clear the background warming should increase the [freezing] levels. This makes for extra potential potency to the impact," he said. "The rivers are already high again, so this one's going to pack a wallop.
  • Marty Ralph, director of the Center for Western Weather and Water Extremes at the Scripps Institution of Oceanography "It hasn't been a lake for a century. An atmospheric river just made it one again", CNN (November 30, 2021)

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