"Rainfall is expected to decrease to the south with around one-quarter to one-half inch for the Inland Empire and Orange County, and around one-third inch across northern San Diego County to around one-tenth inch across southern San Diego County.

Scattered showers are expected early this week for San Diego County, with a slight chance of thunderstorms in the afternoon into Monday morning for the coast, valleys and mountains, forecasters said Sunday.

A Pacific storm that will begin to spread across San Diego County late Saturday could produce enough rain and snow through Tuesday to significantly lower the threat of wildfires across the region, the National Weather Service indicated in an advisory.

Cooler, cloudier conditions and periods of light rain are forecast in San Diego County through Friday night as a weakening atmospheric river moves southward into Southern California, according to the National Weather Service.

A long-duration atmospheric river is set to bring moderate to heavy rain in northern and central parts of California, but south of Los Angeles will likely get a few light, scattered showers this week.