The fire started a half mile from Camino Cielo, west of Montecito Peak. Windy, dry Santa Ana conditions are fueling the fire, which was first reported at 5:16 a.m., according to the Montecito Fire Protection District.
Santa Barbara County fire Capt. Dave Zaniboni told the Associated Press winds of 25 mph are pushing the fire to the east. A helicopter and 10 engines are on scene to assist hand crews working on the ground, and a unified command is being established with Montecito Fire, the U.S. Forest Service and Santa Barbara city and county fire departments.
Northerly gusts are expected to shift to the northeast Thursday night, becoming the first significant Santa Ana wind event of the season, AP reports. When those winds sweep down the mountains toward the sea, they create dangerous air turbulence that can prevent aircraft from getting close enough to drop, said Jim Kunkle, a contractor who runs the Santa Maria Air Tanker Base.
Two firefighting aircraft were unable to drop retardant because of air turbulence as of 8:45 a.m. One other air tanker made a successful drop of 1,200 gallons. The Forest Service has ordered more than 10 tankers, Kunkle said via a statement from the emergency management office. "They're going after everything they can get," he said.
Updated 10:38 a.m.: Evacuation warning zone expanded
The Santa Barbara County Office of Emergency Management has expanded the areas under evacuation warnings. The area now includes zones 2 through 5.

Comment: The Santa Ana winds, that funnel down the face of the mountain range towards the cities of Santa Barbara and Montecito, increase exponentially as evening approaches, complicating the efforts of firefighters and greatly increasing the risk of fire tornadoes and exploding trees. A full-out initial effort offers the best advantage to achieve a quick containment, especially in steep and remote terrain. That window can be frightfully small.