The definition: An atmospheric river (AR) is a long plume of moisture that stretches from the tropics or subtropics into ...

Parts of northern California could see up to a foot of rain, but Phoenix will remain dry and warmer than usual.

The rain will be "generally beneficial" in the Los Angeles area, but there is a small risk of burn scar debris flows.

The storm brought heavy rain and high-elevation snowfall to Northern California over the weekend, and a similar one is ...

What is a Pineapple Express? It's a type of atmospheric river that forms a long, narrow tract in the Earth’s atmosphere. This jet stream gathers moisture from the tropics near the equator and ...

Atmospheric river storms are long plumes of water vapor that can pour over from the Pacific Ocean into California. They carry so much water, they’re said to be like a river in the sky.

The trio of atmospheric rivers is the result of moisture being funneled in between different weather systems spinning in opposite directions over the Pacific — imagine feeding a piece of paper ...

Snow levels are expected to come down a bit over the week as the atmospheric rivers and related warmth shift southward. To the north, mostly light snow fell around Seattle, although it coated ...

The atmospheric river is expected to pack a more powerful punch in Northern California. A flood watch is in effect over a broad swath of Northern California between Monday afternoon through ...

The three atmospheric rivers forecast there “will bring periods of significant rainfall [and] mountain snow over the next week,” said Courtney Carpenter, a meteorologist with the weather ...