LOS ANGELES -- The California Highway Patrol has reopened Interstate 5 through the Grapevine.
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.
Several school districts, including Julian and Mountain Empire, are closed for snow days.
The National Weather Service says a winter storm warning will last until at least 10 p.m.
CHP officers and police throughout Southern California say the rain, hail, lightning and snow caused traffic crashes, spinouts and stalls.
One traffic fatality in Santa Ana may have been caused by rain-slickened streets.