A map from AccuWeather shows that the areas anticipating the heaviest snow include Lassen Park, Donner Pass, Bear Valley, ...

Map of Sierra Nevada in California showing how an atmospheric river develops. Most atmospheric rivers are weak and do not cause damage. In fact, they can provide much-needed rain or snow.

Devastating, life-threatening floods have already started in some states as an atmospheric river causes heavy rainfall.

An atmospheric river is set to strike ... and hazardous travel conditions due slick roads. Forecast maps from the agency ...

Forecasters warn of dangerous conditions as another powerful atmospheric river takes aim at California. While these storms are dreaded for the damage they can cause, they are also essential to the ...

Atmospheric river storms are drought busters in California, dumping huge amounts of rain in narrow corridors within short periods of time. The ongoing storm slamming Los Angeles, the nation's ...

LOS ANGELES—An atmospheric river storm is pounding parts of California on Friday after wreaking havoc throughout the state this week, bringing severe storms, mudslides and feet of snow.