Composite satellite photos of an atmospheric river connecting Asia to North America in October 2017

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

• 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)

External links