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Winter storm and flood warnings posted in Southern California

November 20, 2010 | 10:08 pm

The National Weather Service on Saturday night posted winter storm warnings throughout much of the state in anticipation of a second front coming out of the northern Pacific Ocean.

Except for the Santa Monica Mountains, warnings have been issued for mountain ranges in Los Angeles, Riverside, San Bernarndino and Ventura  counties.

Snow fall is expected to average between 10 and 18 inches above 7,000 feet by Sunday evening. Local snow accumulations of between 2 and 4 inches are possible between 4,000 and 5,000 feet.

Southwest winds will increase to 25 to 35 mph with gusts of up to 50 mph through Sunday morning before shifting to the west and northwest by Sunday night, when they are expected to diminish.

The snow and strong winds will probably affect travel throughout the mountain areas. Snow accumulations are possible Sunday on Interstate 5 through the Grapevine and on the highest portions of the Antelope Valley Freeway.

Rain also has heightened concern about mud and debris flows in areas affected by last year's Station Fire in the San Gabriel Mountains, including Altadena, La Cañada Flintridge, La Crescenta, Tujunga and Sunland.

High surf advisories also have been posted for Santa Barbara and San Luis Obispo counties. Wind advisories were issued for San Luis Obispo County valleys and mountains.

--Dan Weikel