Weather balloons and “hurricane hunter” planes aid the science of understanding California’s atmospheric rivers.

An atmospheric river event is forecast to rainfall, snow, and the potential for flooding to parts of California this week.

Areas charred by last month's wildfires in Southern California now face a new threat from a powerful, but fast-moving Pacific ...

Days after an atmospheric river brought record-setting rainfall to California, the state is in the crosshairs of another ...

A new atmospheric river will bring a new rainstorm to the Los Angeles area in the middle of the week, forecasters say.

Downtown San Francisco was drier, but it still had a big day. The area recorded 2.53 inches on Tuesday, its highest daily ...

The rainfall was so intense that in one dramatic example, a mudslide caused an entire house to slip down a bank into the ...

The second atmospheric river in a pair of storms will bring more rain and cooler temperatures to the Los Angeles area.

Impact from a moisture-laden storm is expected to persist in the San Francisco Bay Area through Friday, with more rain likely ...

The latest NWS forecast says an atmospheric river remains on track to deliver as much as 2 inches of rain in Fresno on ...

The biggest storm of the winter, packing a firehose of rain across much of California, will trigger flooding, mudslides and road closures that may put lives and property at risk during the latter part ...

Rainy conditions are expected to begin sometime Wednesday, and the National Weather Service has already issued a flash flood ...