An atmospheric river brought heavy rain, serious mountain snow and strong winds to California that flooded roads and rivers and triggered landslides – and more rain is on the way. The first storm,

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

The NWS says excessive rainfall is expected to cause flooding along the Russian River, affecting roadways and agricultural land.

Forecasters say 'Pineapple Express' storm will probably be beneficial for Los Angeles and Ventura counties, helping to reduce the risk of wildfires.

A wet pattern will bring periods of rain and showers to Southern California, dropping an inch or two in the Los Angeles region — the most to fall since mid-April. It will be key for firefighters continuing to battle flames.

A slow-moving low-pressure system will linger over the Southwest, bringing steady rain through at least Monday.