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

At atmospheric river continues to slam portions of California Tuesday, with multiple inches of rain expected until Wednesday.

One atmospheric river is already affecting the West right now, and at least two more are forecast to impact next week. The systems, each corridors of deep tropical moisture transported to ...

A warm, wet storm originating in Hawaii will be pulled north toward California bringing heavy rain and localized flood risk.

Numerous weather alerts are in place across Northern California as an atmospheric river is set to bring excessive moisture to the region this weekend. They include a winter storm warning ...