CNN  — 

A slow-moving winter storm has struck the West Coast, flooding highways in Los Angeles and prompting rare blizzard warnings in Southern California.

In its first-ever blizzard warning, the National Weather Service in San Diego said the San Bernardino County mountains could see 3 to 5 feet of snow through Saturday morning.

Blizzard warnings were also issued for Los Angeles and Ventura counties through Saturday afternoon. Up to 5 feet of snow is possible with some isolated areas seeing between 7 and 8 feet. The National Weather Service’s Los Angeles office issued its last blizzard warning on February 4, 1989.