BC-US--California Wildfires, 1st Ld-Writethru,334 Rain aids battle against California forest fire AP Photo LA107, LA106, LA101, CASRP101 reldate(2012-09-06T13:50:24 Eds: Omits tag line. Updates multimedia links. With AP Photos. AP Video. Associated Press LOS ANGELES — Firefighters braced for drier weather Thursday after remnants of a tropical storm helped them gain ground on a 4,180-acre blaze in the San Gabriel Mountains northeast of Los Angeles. Crews were able to double containment Wednesday to 48 percent, working in favorable weather on steep slopes in the Angeles National Forest since Sunday to put out the fire in chaparral that hasn’t burned in 15 …