Willow fire: The blaze in Contra Costa Count has charred 370 acres in Rodeo.
The Alamo Fire is even larger: At some 24,000 acres, it straddles parts of Santa Barbara and San Luis Obispo counties, and was 10 percent contained on Sunday, according to Cal Fire.
And there's no sign of the fires slowing down anytime soon, as Jim Harris, a national forest deputy fire chief noted to NBC News.
The fire that started this weekend in California's Santa Barbara County was "completely out of control", county fire Captain Dave Zaniboni said.
Crews in California made progress overnight on a blaze that swept through grassy foothills in the Sierra Nevada, about 60 miles north of Sacramento.
The California Department of Forestry and Fire Protection website showed that the fire east of Santa Maria had exploded to almost 30 square miles (about 77 sq. kilometers) Saturday. It is 17 percent contained and threatens another 750 structures, Cal Fire said.
A pair of California wildfires have quickly spread, threatening hundreds of homes and forcing evacuations at a popular lakeside campground and a summer camp where flames temporarily trapped children and counselors, a fire official said. Officials couldn't immediately say how many were homes.
The American Red Cross has opened a shelter for evacuees.
They were in Oroville on Friday when the fire broke out and roads to their hillside homewere blocked. Buildings have burned but officials weren't yet sure if they were homes.
"We're getting into the busy time of year", she said. "We're in shut down mode right now, it's so devastating".
Firefighters battle a wildfire as it threatens to jump a road near Oroville, California, on July 8, 2017. It's 15 per cent contained. That was up from 19,000 acres on Saturday evening.
Four people have been injured by the Wall fire, according to authorities.
The state five-year average for that period is 27,390 acres.
Josh Edelson, the photographer who took the picture, shoots wildfires in California every summer.
Daily temperature records in several cities in the U.S. West may be tied or broken on Saturday, the Weather Service said. The report stated that the wildfire spread fast due to the tall grass and the drouth-stricken vegetation in the region. And they rode it out with them for hours.
The average number of large wildfires has risen from about 140 per year in the 1980's to roughly 250 per year in the 2000's, according to the Union of Concerned Scientists.
Firefighters had built containment lines around 85 per cent of the blaze as of Monday, and residents of nearby homes were no longer on standby to evacuate.