Atmospheric rivers are long and relatively narrow bands of water vapor that form over an ocean and flow through the sky, transporting much of the moisture from the tropics to northern latitudes.

Heavy rain from the latest atmospheric river triggered flood warnings for several Bay Area counties along with some evacuations in Santa Cruz County Thursday.The National Weather Service issued a ...

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

LOS ANGELES — The high risk of mudslides prompted evacuation orders Thursday for some Los Angeles neighborhoods ravaged by ...

A monster rainstorm was drenching southern California on Thursday, with officials in LA readying for flooding and landslides ...