Rain, snow and cold temperatures on Thursday replaced the blue skies and sunshine San Diego enjoyed earlier in the week.
Showers, some of them heavy and accompanied by gusty winds, rolled through before noon. The mountains received a third of an inch of snow in the same time period.
Rain-slick roads created dangerous conditions for some drivers.
The California Highway Patrol reported that most accidents Thursday involved the weather and speed.
Near Lakeside, a red sedan lost control going downhill on State Route 76 north of Slaughterhouse Canyon Road.
As the car spun out across lanes of traffic, a Ford Ranger clipped the sedan.
The sedan continued out of control, hitting the embankment and flipping, according to the CHP.
The driver was trapped inside her car when firefighters responded. The young woman sustained minor injuries, and the other driver was not injured.
CHP officers recommend that drivers check their tires to make sure they have plenty of tread and slow down because cars won't react as quickly on wet roads as they otherwise would.
NBC 7’s Dagmar Midcap said snow is possible at elevations above 3,500 feet Thursday night and Friday morning. Snow plows were on standby Thursday night in Julian.
The rest of the county could see sprinkles during the Friday morning commute. San Diegans can expect dry weather and warmer temperatures this weekend.