LOS ANGELES _ The monstrous Thomas fire burned itself into the California history books again Thursday as fire officials confirmed it now ranks as the fourth largest on record.
Despite a couple days of reduced winds and feverish efforts by firefighters to establish new containment lines, the 242,500-acre blaze has surpassed the size of the Zaca fire, which scorched Santa Barbara County in 2007, according to Dave Zaniboni, a spokesman for the Santa Barbara County Fire Department.
Ironically, firefighters hope the 240,207-acre Zaca fire burn scar, as well as the younger vegetation it contains, will help them fight the Thomas fire's growth along its western edge.
Firefighters have taken advantage of a two-day lull in winds to increase fire containment to 30 percent. Those efforts could be tested soon, however, as forecasters predict a new blast of Santa Ana winds Thursday, and sundowner winds over Santa Barbara County on Friday.
At a morning briefing Thursday, fire commanders said another day of extremely low humidity and moderate winds would greet firefighters as they continued to build containment lines above Carpinteria, Montecito and Santa Barbara.
The mountains north of the coast produce notoriously unpredictable and dangerous conditions for firefighters, said fire behavior analyst Tim Chavez. In the Matilija wilderness, which straddles the border between the two counties, observers saw 50-foot flames backing down a hillside overnight, he said. It's unusual to see flames that tall working their way down a mountain, officials said.
"This thing is 60 miles long and 40 miles wide," Chavez said of the blaze. "There's a lot of fire out there."
Gusty Santa Ana winds are expected for Los Angeles and Ventura counties Thursday, said Stuart Seto, a weather specialist with the National Weather Service. In the mountains, gusts of 55 mph are possible.
In the valleys, 15 to 25 mph gusts are predicted, with some gusts of up to 40 mph, Seto said. Over the past few days, a break in the weather has allowed firefighters to increase containment.
"That's the thing, it's just going to do the opposite now. The humidities are still down in the single digits," Seto said. "These winds, especially in the mountain areas, are really going to start blowing the fire around again. What it does is carry the embers further down and can create more fires."
Winds will be north to northeast, and usually the Ventura side is more affected than the Santa Barbara side, Seto said.
"But it's still going to have an effect up in the mountain areas of Santa Barbara," he added. Winds up there will be up to 25 mph and a little gusty, "so there's still going to be a big concern up in that area," he said.
Throughout mountain areas on Thursday there's a greater risk for large fire plumes, which can cause erratic fire behavior.
"It carries the heat up, and it looks like a thunderstorm cloud," Seto said. "From there, the fire could spread out. Sometimes they collapse, and it's a strong down-rush of winds and it spreads the fire."
Sundowner winds are expected Friday into Saturday in the Santa Barbara area. On Sunday, winds are expected to return to offshore conditions, Seto said.
