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

Heavy rain is hitting the Bay Area and coastal areas this week as an atmospheric river moves through Northern California.

After an unusually dry January, a weather system called an atmospheric river - or Pineapple Express - is now headed towards ...

An atmospheric river event that slammed California this week is expected to subside on Wednesday after causing some flooding, ...

Here's the latest forecast for an upcoming winter storm that forecasters hope could finally lift Los Angeles County from the ...

An atmospheric river is expected to bring three major storms with significant rain, snow and wind to Northern Nevada for the next several days. But what is an atmospheric river? Here's a look at ...

While the wet weather may bring an end to a devastating run of wildfires in the state, it could also cause flooding and other hazards.

AccuWeather meteorologist Matt Rinde told Newsweek: "Since there is no hard and fast definition, some events may or may not be attributed to an atmospheric river. We tend to move toward calling it ...

A group of scientists from Southern California recently came to the Bay Area to send up a series of weather balloons to help ...

An atmospheric river is pounding Northern California with heavy rain and the threat of flooding before heading to Southern California.

Following heavy snow in Oregon and a few reports of flooding in far Northern California, the FOX Forecast Center said a ...