LOS ANGELES—The California Highway Patrol has once again closed the Grapevine section of Interstate 5 north of Los Angeles, after briefly reopening it earlier Thursday.

Several accidents and spinouts were reported in the mountain pass Thursday morning as cold winter weather bore down on Southern California.

The National Weather Service says the mountains could see snow levels down to 2,000 feet Thursday, while winds may gust to 60 mph there and up to 45 mph in valleys and coastal areas.

Highs will only hit the 50s and 60s and rain showers are expected throughout the region. It's expected to be even colder on Friday and the cold will linger through the weekend.

There also will be overnight frosts and freezes in colder valleys.