An expert at the Scripps Institution of Oceanography explains the weather phenomenon that can wreak havoc across California.

The weather phenomena are common for California winters, but they could cause dangerous debris flows or mudslides in recently ...

An atmospheric river is expected to hit California later this week, bringing heavy rain and wind to much of the state.

What is an atmospheric river, and how does it affect the Western U.S.? This can, at times, create some extreme weather conditions ... used to this sort of phenomenon. You can see how this week's ...

An atmospheric phenomenon called a Pineapple Express is ... It's a type of atmospheric river that forms a long, narrow tract in the Earth’s atmosphere. This jet stream gathers moisture from ...

Accuweather meteorologists predict this atmospheric phenomenon could bring strong winds, heavy rains and landslides. More:Atmospheric river will ... when the El Niño weather pattern is in force ...