Atmospheric rivers are long and relatively narrow bands of water vapor that form over an ocean and flow through the sky, ...

An atmospheric river is slamming portions of California, with multiple inches of rain expected to drench the area until the storm runs out of moisture Wednesday morning, forecasters say.

An atmospheric river is a massive band of water vapor that carries rain to an area. The National Oceanic and Atmospheric Administration (NOAA) said in a forecast: "A prolonged atmospheric river ...

The time-lapse views showed a "prolonged atmospheric river" that brought heavy rain and ... vapor outside of the tropics," according to the NOAA. The storm arrived on Friday, saturating the ...