"The fire continues to threaten structures in various parts of the cities of Ventura, Ojai, Casitas Springs, Santa Paula, Carpinteria, Fillmore and the unincorporated areas of Ventura County and Matilija Canyon", Cal Fire said in an update on its website.
Helicopters were also dousing homes with water to protect them from the flames, fire officials said.
Brown said he believes "firefighting at Christmas" time is "the new normal".
This type of behavior is generally seen during massive wildfires.
While smaller fires had plagued areas closer to Los Angeles last week, Esseling described the Thomas fire as "the granddaddy of them all".
Throughout Sunday, the blaze was also was burning very aggressively toward the west on the north side of the Santa Ynez Mountains, and in the Rose Valley area north of Ojai.
Whitmer calls for investigation into MSU's handling of matters involving Nassar
Nassar, 54, worked at Michigan State University and at USA Gymnastics, the Indianapolis-based group that trains Olympians. Both Whitmer, a Democrat, and Schuette, a Republican, are seeking their party's nomination for MI governor in 2018.
The mandatory evacuation area was expanded to include city areas east of Mission Canyon and north of Highway 192/Foothill Road, as well as the area between Olive Mill Road and San Ysidro Road on the north side of Highway 101.
Virginia Pesola, 70, of Santa Paula, was the first confirmed death as a result of the multiple blazes, as she was found dead Wednesday night at a auto crash site along an evacuation route northeast of Ventura. The medical examiner said the cause of her death was blunt force injuries, smoke inhalation and heat injuries.
The blazes have destroyed almost 800 structures, and a 70-year-old woman died last Wednesday in a auto accident as she attempted to flee the flames in Ventura County. Gusts are expected to blow from 30 to 50 miles per hour, according to the VCFD.
The Thomas Fire, one of five destructive blazes currently burning in California, now ranks as the tenth largest wildfire on record in the state. Jerry Brown paid a visit to Ventura on the sixth day of the Thomas Fire fight.
Firefighters across Southern California made progress on Saturday battling a slew of scattered wildfires that have killed at least one person, destroyed hundreds of buildings and forced more than 200,000 people from their homes this week. He directed federal assistant to supplement state and local emergency response. Gusts of up to 35 miles per hour have caused the fire to spread erratically. A total of 12 structures were damaged and six destroyed.