If the Mendocino Complex Fire continues to grow, it could become the largest wildfire the state has seen in nine decades, surpassing the Thomas Fire, which burned through almost 282,000 acres of land in December 2017 in Ventura and Santa Barbara counties. Two firefighters and four other people, including two children, were also killed.
The two fires cover an area larger than a deadly wildfire burning near Redding, California.
Gilless said the reason California's wildfires are so destructive this year is the state's "high heat, low relative humidity, high wind speeds and high fuel loading".
As for the northeast section of the fire that is moving further into the Mendocino National Forest, Blankenheim said firefighters were building lines around several cabins on private property near the edges of the Snow Mountain Wilderness as the fire continued east below.
The Carr Fire - which has torched 163,207 acres (66,047.5 hectares) in the scenic Shasta-Trinity region north of Sacramento since breaking out on July 23 - was 45 percent contained.
The Ranch Fire was just 22 percent contained and the River Fire was 50 percent contained.
Cal Fire deputy chief Scott McLean described the wildfires as "extremely fast, extremely aggressive [and] extremely dangerous".
The wildfires are "extremely fast, extremely aggressive, extremely risky", said Scott McLean, a deputy chief with the California Department of Forestry and Fire Protection.
More than 14,000 firefighters are fighting various fires across the north west of the US.
"Over the past 48 hours, fire has impacted all of the roads used to access Yosemite Valley, burning dead and downed trees that can become very explosive and fall without warning", according to the National Park Service.
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Combined, they form the biggest blaze that California firefighters are now battling.
Some 15,000 structures were threatened, 68 homes have been destroyed and at least a dozen are damaged, officials said. The Thomas Fire scorched a much more densely populated area, burning through 1,063 structures and damaging 280 more.
"Time and again, we see vivid boundaries between the young, healthy, growing forests managed by state, local, and private landholders, and the choked, dying, or burned federal forests", McClintock said.
Mandatory evacuations remain in effect for parts of Colusa, Lake and Mendocino counties.
The president's comment comes after he said Sunday that too much water from the northern part of the state is being wasted by flowing into the Pacific Ocean.
The Ranch Fire is 225,001 acres and containment has decreased to 21% - making this fire the sixth largest in state history by itself.
They have been deployed to fires in the Pacific Northwest and California. "Must also tree clear to stop fire spreading!" - tweet Sunday.
Neither McLean nor Jessica Gardetto, a spokeswoman for the Idaho-based fire agency, would address the tweets directly, but Gardetto said by telephone, "Most wildfire suppression efforts involve firefighters and boots on the ground".
The last time active-duty military personnel were mobilized was in September 2017, when 200 soldiers from JBLM were mobilized to help battle the North Umpqua Complex wildfires in OR for 30 days, NIFC said.