An atmospheric river is a long, narrow band of moisture that oftentimes comes ahead of a storm system. It's a big source of moisture for the Western U.S. and, specifically, the Sierra Nevada and ...

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.

Heavy precipitation is falling mostly in mountain areas. A flood watch in also in effect for the coast of central California, ...

Two men row a boat in front of a flooded RV park after an extreme atmospheric river event brought flooding to Sonoma County in California in November 2024. An atmospheric river is a long plume of ...