Thomas Fire now largest wildfire in modern California history

The Thomas Fire grew to 273,400 acres in size Saturday morning, making it the largest wildfire in California history.

While charring both Ventura and Santa Barbara counties, the Thomas Fire surpassed the acreage total of the 2003 San Diego-area Cedar Fire, which burned 273,246 acres. The Cedar Fire caused more damage, though. It destroyed 2,820 acres and resulted in 15 deaths.

Thus far, the Thomas Fire has destroyed 1,063 structures, including 775 single-family homes. The blaze has resulted in one death — a San Diego County firefighter died while battling the Thomas Fire.

As of Saturday morning, the Thomas Fire is 65 percent contained. Earlier in the week, firefighters made significant progress battling the blaze as a cold front moved through the area.

But, officials say fire activity will increase over the next few days as an offshore flow will bring above average temperatures and lower relative humidity.

No mandatory evacuations remain in effect. Residents of both Ventura and Santa Barbara counties have been allowed to return to their homes.

There is no longer any fire activity in the Montecito area. However, Ventura County residents who live along Highway 33 between Rose Valley and Hartman Ranch still have voluntary evacuation warnings, as there is fire activity nearby.

The Thomas Fire ignited on Dec. 4 north of Santa Paula near highways 150 and 126. Santa Ana winds fueled the blaze, pushing it into Santa Barbara County and leading to the destruction of multiple expensive homes in Montecito.

Investigators have yet to determine the cause of the fire.