LOS ANGELES (CNS)—A wet and potentially damaging storm is expected to hit the Southland Jan. 28, bringing what forecasters are calling an “atmospheric river” of moisture that will persist into Jan. 29. Rain was already falling Jan. 2 over San Luis Obispo County, where the system remained largely stalled. “The front sags southward into Ventura and Los Angeles counties by Thursday afternoon into Friday,” according to the National Weather Service. “Heaviest rainfall across the southern counties will occur Thursday night into Friday morning. Several inches of rain are expected with flooding concerns including recent burn areas. Several feet of high elevation mountain snow is also expected, along with moderate to strong winds.” The National Weather Service initially issued a winter storm watch for the Los Angeles County mountains, excluding the Santa Monica range, from Jan. 28 afternoon through Jan. 29 afternoon, but the agency later upgraded it to a winter …