A winter storm that is on track to hit Southern California on Thursday is expected to bring steady rain to the region and has authorities in areas devastated by deadly fires and mudslides on alert. The heaviest rainfall near the massive burn scars in Santa Barbara and Ventura counties is expected Thursday evening and in the predawn hours Friday, said Curt Kaplan, a meteorologist with the National Weather Service in Oxnard. Flat areas could see an inch of rain, and two to three inches on ocean-facing mountain slopes is possible.