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

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

One of the more potent storm systems so far this season is setting up to bring significant widespread rainfall and windy conditions to much of San Diego towards the middle of the week.

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 ...

The second of three atmospheric rivers is battering the West, bringing prolific mountain snows and soaking rains in the lower elevations and driving the risk of flooding and avalanches. Yet another in ...

One atmospheric river is already affecting the West right now, and at least two more are forecast to impact next week. The systems, each corridors of deep tropical moisture transported to ...

An atmospheric river is developing off the ... and the potential for some flooding concerns. The plume of sub-tropical moisture will first reach San Diego sometime Wednesday morning into the ...

In the northern Sierra Nevada, snow will fall in feet — not inches. And in the northern California Coastal Range, a general 5 to 10 inches of rain is expected to fall.