"Numerous flash floods, hazardous travel, power outages, and tree damage can be expected as the storm reaches max intensity," the NWS has warned.

An atmospheric river may be approaching Northern California, bringing heavy rain, the National Weather Service said Sunday.

The first notable atmospheric river of the season is due to impact Northern California this week and could bring heavy rain and flood risk to the Bay Area, according to the National Weather Service. The weather system is due to arrive mid-week with the heaviest impact expected in the North Bay.