SANTA BARBARA, Calif. — Calming winds Friday gave firefighters a chance to gain ground against a huge wildfire in coastal mountains northwest of Los Angeles but forecasters warned that conditions would remain dry and warm and the respite from gusts would only be temporary. Red Flag warnings for the critical combination of low humidity and strong winds expired for a swath of Southern California at midmorning but a new warning was scheduled to go into effect today in the fire area due to the predicted return of winds. The so-called Thomas Fire, the fourth-largest in California history, was 35 percent contained after sweeping across more than 394 square miles of Ventura and Santa Barbara counties since it erupted Dec.