A firefighter died Thursday while battling the Thomas fire as authorities braced for new powerful winds that could pose threats to homes in Santa Barbara and Ventura counties. Officials said a combination of Santa Ana and sundowner winds will hit the area from Thursday through Sunday, bringing new dangers to a fire that now ranks as the fourth-largest in the state’s modern history. As they prepare for the new battle, firefighters were also grappling with loss. “I am very saddened to report that a firefighter fatality has occurred on the Thomas Incident,” Chief Ken Pimlott, the director of the California Department of Forestry and Fire Protection, said in a statement.