The so-called Mendocino Complex fire is only a couple of square miles larger than a deadly blaze last December but it's still growing.
At more than 290,692 acres, the fire spans more than 454.2 square miles.
The Holy Fire popped up on Monday in Orange County in Southern California and had already spread to 4,000 acres by 8 p.m. with zero percent containment.
Dozens of fires are now burning across California.
McLean said firefighters are using the direct approach to prevent the fires from reaching urban areas along Clear Lake while retreating in national forests "and letting the fire come to us". "The overload of dead and diseased timber in the forests makes the fires worse and more deadly".
The fire is burning in mostly rural areas, though 143 buildings have been destroyed, including 75 homes, and 26 other buildings have been damaged.
He was the seventh person to die in that blaze, which has scorched more than 160,000 acres (64,750 hectares) in the scenic Shasta-Trinity region north of Sacramento, including two young children and their great-grandmother whose home was overrun by flames, and two firefighters.
For the latest updates about all California's wildfires, go to Cal Fire's "Incidents" page. Fueled by high temperatures, low humidity and wind, the fire has destroyed almost 170 homes and other structures, according to The Washington Post. Since we last reported on the fire two days ago it has grown by 120,000 acres, according to the numbers released by CAL FIRE Monday morning.
Authorities say it was triggered by the "mechanical failure of a vehicle" that caused sparks to fly in tinderbox-dry conditions. In addition, "the rates of mortality from fire, insects, and disease are about three times as high on national forest lands as they are on private lands regulated under California's strict environmental laws", he said.
Heat and poor relatively humidity will continue to plague firefighters battling this fire into early this week.
In addition, 180 fire management specialists from Australia and New Zealand have now arrived in the U.S., most assigned to work on fire fronts in California and the Pacific Northwest.
The Pentagon announced Monday that it will send about 200 soldiers from Joint Base Lewis-McChord in Washington state to help with the firefighting efforts.
"California is going through a really heartbreaking fire season right now", he added.
"Can be used for fires, farming and everything else", the president said.