Rainfall amounts will vary, with the potential for brief heavy downpours and small hail, according to the National Weather Service.
The snow level will be in the 3,000- to 4,000-foot range, with four to eight inches likely above 5,000 feet.
The roads that could be affected by snowfall include Interstate 5 near the Grapevine, Highway 14 through Soledad Canyon, Highway 138 in the Antelope Valley and Highway 33 in the Ventura County mountains.
In the Angeles National Forest, portions of Angeles Forest Highway and Upper Big Tujunga Canyon Road were scheduled to be closed Thursday evening because of snow, the Los Angeles County Department of Public Works said on its website.
-- Cindy Chang, Los Angeles Times