UPDATE 8:29 a.m.: Caltrans has reopened Interstate 5 through the Grapevine after the key connector between northern and southern California was closed early Friday morning due to snow.
It's going to take a while for northbound traffic to return to normal, though, because there is a miles-long big rig back-up. The interstate was closed for nearly six hours.
To the east, Interstate 15 through Cajon Pass is also open. And several school districts, including Julian and Mountain Empire, are closed for snow days.
PREVIOUSLY: The Interstate 5 Freeway north of Los Angeles was closed early Friday morning after a winter storm brought rain and snow to the region.
There was no estimate on when the Grapevine section of the freeway between Castaic and the San Joaquin Valley will reopen, according to the California Highway Patrol. Several big rigs were stuck along the major north-south truck route.
The cold weather system arrived in Southern California late Thursday, generating showers and thunderstorms. Low snow levels also led to mountain road closures in the Angeles National Forest.
CHP officers and police throughout Southern California say the rain, hail, lightning and snow caused traffic crashes, spin outs and stalls.
In Santa Ana, police say a man was killed when his car slammed into a tree on a wet West MacArthur Boulevard around 2 a.m. The cause is under investigation to see how much the rain was to blame.
To the east, Interstate 15 through Cajon Pass is open but the cold storm that blew through Ventura and Los Angeles counties early Friday is headed that way.
The National Weather Service says a winter storm warning will last until at least 10 p.m. The forecast calls for showers and possibly a thunderstorm Friday, mainly before 4pm. Then clearing overnight and sunny, but cooler weather through the weekend.