No homes have burned but the blaze is surging through sparsely populated areas of Yolo and Napa counties about 50 miles from the state capitol of Sacramento.
Fire containment stands at 5 percent as more resources have been added to the fight, including two Air Force Reserve MAFFS C-130 air tankers flying out of their home at Peterson Air Force Base in Colorado Springs.
"The potential for growth remains high as crews battle the fire in hard terrain", Cal Fire said in an advisory, noting that more than 2,000 firefighters were tackling the blaze.
Wildfires have burned through almost 2.5 million acres in the United States from January 1 through Monday, well above an average of about 2.3 million for the same calendar period over the last 10 years, according to the National Interagency Fire Center. "A backfire puts black between the main fire and the main edge so that when it comes down there is nothing left to burn", said Brian Ward of the Eldorado Hotshots. Duchesne County officials have issued evacuation orders for an unknown number of houses and cabins in the area. Officials said the fire almost doubled in size on Monday.
In Colorado, firefighters were hampered by adverse weather conditions to combat flames in six major wildfires that have charred more than 100,000 acres across the state, said Larry Helmerick, spokesman for the Rocky Mountain Coordination Center.
He said slightly cooler temperatures were forecast later on Monday (local time) but gusty winds that could spread the blaze were also expected.
For the latest evacuation information visit the Lake County Sheriff's Office's here. But there are also quite a few additional fires that you'll want to keep an eye on today.
CAL FIRE has been assisting Los Padres National Forest with this fire, which is located north of Lake Piru in Los Angeles County, and is listed as active on CAL FIRE's map. Smoke and ash are contributing to poor air quality in the San Francisco Bay Area and California wine country.
San Luis Valley Emergency tweeted Monday night that 104 homes have been destroyed so far by the Spring Fire burning east of Fort Garland. It is in the rural community of Guinda in Yolo County.
Road closures were still in effect at Mule Skinner Road and Highway 20, Walker Ridge Road and Highway 20, and Highway 20 between Highway 16 and Highway 53, according to Cal Fire. By Sunday afternoon, that had been reduced to 1,064 firefighters as crews had the fire 73 percent contained.