There are mandatory evacuation orders for the Moccasin Estate subdivision and advisory evacuations for the Hetch Hetchy area.
Favorable overnight weather helped crews gain progress on a 1,500-acre wildfire burning near The Geysers geothermal facility in rural Sonoma County.
The wildfire in unincorporated Sonoma County began Sunday morning, near Geysers and Geysers Resort roads, about 10 miles east of Cloverdale, Cal Fire spokeswoman Christina Barker said.
A wildfire grew rapidly in Sonoma County, California, starting Sunday morning.
The cause of the fire was unknown and under investigation, Cal Fire said.
The blaze started Monday afternoon on the southern edge of Santa Clara County.
About 20 to 30 homes have been evacuated and 530 firefighters were battling the blaze, according to the Sonoma County Sheriff's Office.
Officials are also working hard to keep the conflagration away from the Geysers geothermal facility, which is not far from the wildfire's current location, SFGate.com said.
Temperatures were in the high 90s with low relative humidity Sunday, and forecasts call for similar conditions on Monday.
"Our remaining plants at the Geysers continue to operate normally and our team is constantly assessing the situation and will take all steps necessary to ensure the safety of employees and the preservation of our facilities", Kerr said in an email.
As he watched Cal Fire air tankers make passes over the burn area from his front porch, he hoped the flames stayed on the other side of the nearby ridge.
Fire personnel from across the west are now battling to contain a #Wildfire which first erupted near Vandenburg Air Force Base in California.
Firefighters are expecting dry conditions, powerful winds and sweltering heat Monday due to a strong high pressure system moving over the San Francisco Bay and Monterey Bay areas.