WATCH LIVE: Track the rain with Live Doppler 7
The National Weather Service warned residents in the area to be on alert until 6 p.m. on Sunday.
The Loma Fire burned nearly 4,000 acres just weeks ago, which is increasing the risk of mudslides. "The side of Loma Prieta where the fire was, there's nothing to hold the soil and if the rain continues like this, mudslides are going to be over there," Los Gatos resident Dan Millar said.
RELATED: Download the ABC7 News App to get your weather forecast and severe weather alerts on the go
Rain rates of up to half an inch per hour, combined with debris flows in the areas of the burn scars, could pose a risk for flash flooding in Santa Clara and Monterey counties.
Rain will primarily be heavy in the Santa Cruz Mountains and the northern Santa Lucia Mountains on Sunday, NWS officials said. Lingering showers may persist Sunday night and possibly into Monday.
Sunday rain predictions include 1.49 inches of rain in Santa Cruz County, 0.84 inches in Sonoma County and 0.69 inches in San Mateo County.
Sunday's storm was rated a 1 on the ABC7 Storm Impact Scale.
RELATED: The ABC7 News Storm Impact Scale explained
What's the weather like #whereyoulive? Share your photos and videos on Twitter, Instagram, or Facebook by tagging them #abc7now. Your photos may be shown online or on-air!
Bay City News contributed to this story.