Crews battling a massive wind-driven California wildfire that has torched nearly 800 buildings and charred 230,000 acres are bracing on Monday to protect communities menaced by flames along the state's scenic coastline.
The Thomas Fire ignited last week and is burning in Ventura and Santa Barbara counties, about 100 miles northwest of Los Angeles.
"Fire will continue to threaten the communities of Carpenteria, Summerland, Montecito and surrounding areas," the California Department of Forestry and Fire Protection (Cal Fire)said in a Sunday night update.
The Sacramento bureau of the National Weather Service said in a tweet that the Thomas Fire is now the fifth largest fire in California's recorded history.
Santa Ana winds and the rugged mountainous terrain have hindered firefighters as they battle the blaze, which has destroyed 790 houses, outbuildings and other structures and left 90,000 homes and businesses without power.
"A lot of these guys (firefighters) have fought a lot of fires in the past few months and are fatigued," said Fire Captain Steve Concialdi, spokesman for the Thomas Fire.
Concialdi said firefighters from 11 Western states are aiding firefighting efforts.
The fire is 10 percent contained, down from 15 percent on Saturday after it blew up on Sunday, growing by 56,000 acres in one day and making a run of 7 miles, Concialdi said.
Nearly 5,800 firefighting personnel are working on the blaze, Cal Fire said. The cost of fighting as of Sunday was nearly $34 million, the agency added. It is already the fifth-largest wildfire on record in California.
At the University of California, Santa Barbara, final exams set for this week have been postponed, Chancellor Henry Yang said in a letter to the campus community. Air quality and transportation issues, along with power outages that have affected the school's information technology department, forced the delay of exams until January.
Some of the other fires burning over the past week in San Diego and Los Angeles counties have been largely controlled by the thousands of firefighters on the ground this week.
Both the Creek and Rye fires in Los Angeles County were 90 percent contained by Sunday morning, officials said, while the Skirball Fire in the posh Bel Air neighborhood of Los Angeles was 75 percent contained.
North of San Diego, the 4,100-acre Lilac Fire was 75 percent contained by Sunday and most evacuation orders had been lifted.
WATCH: Thomas fire now larger than all of NYC
