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

An atmospheric river is essentially a narrow band of Pacific moisture, water vapor, that is funneled into a long narrow flow.

Heavy precipitation is falling mostly in mountain areas. A flood watch in also in effect for the coast of central California, ...

One of the more potent storm systems so far this season is setting up to bring significant widespread rainfall and windy ...

Both are swirling counterclockwise, sweeping robust moisture along from the central tropical Pacific and slingshotting it nearly 3,000 miles to the northeast. The ongoing atmospheric river will be ...

While the wet weather may bring an end to a devastating run of wildfires in the state, it could also cause flooding and other hazards.

The snow level will increase Friday night into Saturday. A rain-snow mix is likely over Donner Summit Friday night into early Saturday morning. That may change back over to wet snow for the summit on ...

JUST CONNECTED TO THIS BIG TAP, THIS ATMOSPHERIC RIVER THAT CONNECTS ALL THE WAY DOWN TO THE TROPICAL PACIFIC. NOW, THERE ARE ...

Weather systems that affect the West Coast of the United States often have their origins in the northern Pacific Ocean. This is because the jet stream usually flows in a general west-to-east fashion.