Southern California faces a risk of damaging debris flows this week, as a potentially strong atmospheric river is set to arrive in the region.
Rain is likely to arrive by Wednesday morning, but the bigger threat is expected early Thursday, and continuing through Thursday night or Friday morning. The storm threatens to drop significant amounts of rain, forecasters say — possibly 2 to 4 inches or more along the coast and in valleys, and 4 to 8 inches or more in the mountains and foothills.
There’s a 60% chance of rainfall of that magnitude in Santa Barbara and San Luis Obispo counties, and a 40% chance in Los Angeles and Ventura counties, the National Weather Service said Sunday. The risk of significant rainfall in L.A. and Ventura counties worsened from Saturday’s forecast, which described a 30% chance of high rainfall…