The National Weather Service in Oxnard has issued a winter weather advisory through at least noon Thursday for Los Angeles and Ventura County mountains.
An additional 2 to 6 inches of snow is possible above 4,000 feet, and snow levels are locally down to 3,500 feet, with southwest winds of 20-30 miles per hour and gusts up to 45 miles per hour.
Drivers should be cautious of hazardous conditions from snow- and ice-covered roads through the mountains, the weather service said.
Motorists should avoid mountain driving if possible and check the latest road reports before departing. Officials are urging drivers to keep emergency kits in their vehicles, including flashlights, food and water, extra clothes, blankets and tire chains.
The National Weather Service in San Diego has issued a winter storm warning for the mountains of San Bernardino and Riverside counties above 4,500 feet this morning.
Snow showers and isolated thunderstorms could occur throughout the morning, with an additional 4 to 8 inches of snow possible. There could be areas of near zero visibility because of blowing snow and fog.
A winter storm warning for San Diego County mountains above 4,500 feet will remain in effect through Thursday evening.