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

El Niño and La Niña are climate phenomena that are generally associated with wetter and drier winter conditions in the ...

A pineapple express is a type of strong atmospheric river that carries moisture towards the western U.S. causing the risk of flooding and heavy snow.

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 ...

Another atmospheric river is expected to bring heavy rain to most parts of California this week, raising concerns over flooding on the heels of an earlier system that broke daily rainfall records ...

A stronger atmospheric river is set to hit Northern California on Monday and then hit Los Angeles County on Tuesday, aiding hopes of a more definitive end to a devastating fire weather season for ...