Southern California firefighters have contained part of the fifth-largest fire in the state's history but warned coastal communities that they are still at risk if unpredictable winds whip up again and fan the flames. Firefighters made some progress yesterday on corralling the so-called Thomas Fire, which has spread into national forest land northwest of Los Angeles. <br/><br/>However, they warned that the fire would continue to spread west as it eats up parched brush. By last evening, state fire officials said the blaze was 30 percent contained but it continued to threaten Santa Barbara, Carpinteria, Summerland and Montecito. Since the blaze broke out on December 4, it has burned more than 372 square miles and destroyed 921 buildings, including at least 700 homes. It threatens 18,000 buildings and has prompted evacuations of about 100,000 people.