How long will rain and snow keep falling on Southern California?

LOS ANGELES — Amid more snow in the San Gabriel Mountains, a winter weather advisory has been extended until 8 p.m. Friday.

The National Weather Service reported additional snow accumulations of 4 to 8 inches above 6,000 feet, down to a dusting at 4,000 foot elevations. East winds will gust at 35 miles per hour at times.

“Travel could be very difficult across the higher elevation roads, including portions of Highways 2 and 39. Although unlikely, there is a chance for snow-related impacts to the Grapevine on Interstate 5,” according to a statement. “If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency.

The winter weather advisory, which denotes horrendous mountain travel conditions, had been scheduled to expire at 5 a.m. Friday.

Forecasters said the storm will produce 8 to 14 inches of accumulation at 6,000 feet and 4 to 8 inches between 5,000 and 6,000 feet.

At sea level, between a half-inch and 1 inch of rain is expected, increasing to between 1 and 2 1/2 inches in the San Gabriel Mountains.

The storm has also been a significant rain producer. The wettest spot in Los Angeles County was Redondo Beach, where 0.79 of an inch fell in the 24-hour period ending at 5 p.m. Thursday, according to the National Weather Service.

Other top rainfall totals included 0.78 of an inch in Woodland Hills, 0.69 of an inch in Northridge, 0.68 of an inch in Chatsworth, 0.66 of an inch in Van Nuys, 0.65 of an inch at Long Beach Airport, 0.62 of an inch in Sandberg, 0.59 of an inch at Los Angeles International Airport and Pasadena, 0.52 of an inch in downtown Los Angeles and San Gabriel, 0.51 of an inch in Hawthorne and 0.49 of an inch in Lancaster.

The weather service forecast showers in LA County Friday and highs of 44 on Mount Wilson; 56 in Palmdale; 57 in Lancaster; 60 in Santa Clarita and Avalon; 61 in Pacoima and Sylmar; 62 in San Gabriel; 63 in San Pedro, West Covina, Pasadena, Burbank, Panorama City, Van Nuys, Sherman Oaks, North Hollywood, Encino, Tarzana, Granada HIlls, North Hills, Winnetka, Woodland Hills, Agoura Hills and Calabasas; 64 in Studio City, Canoga Park, Chatsworth, Northridge and Long Beach; 65 in Hawthorne, Torrance, Glendale, Whittier and at LAX; and 66 in downtown LA. Cloudy skies are expected Saturday through Monday, after which at least three days of sunny skies are expected.

The NWS forecast showers in Orange County and highs of 40 on Santiago Peak; 50 on Ortega Highway at 2,600 feet; 55 at Fremont Canyon and Trabuco Canyon; 58 in Mission Viejo, Laguna Beach and San Clemente; 59 in Huntington Beach, Newport Beach and Yorba Linda; 60 in Anaheim and Irvine; and 61 in Fullerton, Garden Grove and Santa Ana. Sunnny skies will make a return Tuesday.

In Orange County, a flash flood watch will be in effect through Friday afternoon.

The slow-moving storm should move east out of the Southern California area on Friday afternoon, having doused the region since Sunday.