The definition: An atmospheric river (AR) is a long plume of moisture that stretches from the tropics or subtropics into ...

The atmospheric river's effects are expected to last at least through Tuesday, one meteorologist told Newsweek.

Heavy rain and heavy snow are expected to affect Northern California this weekend as an atmospheric river arrives.

"The Pineapple Express is an atmospheric river which has its origin in the tropical Pacific," said AccuWeather Senior Meteorologist Alex Sosnowski. Since the pineapple express starts thousands of ...

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 ...