Storm Brings Rain and Scores of Accidents : Weather: Highway Patrol reports at least 140 accidents on slippery county freeways. Mountains get first snow.

A storm system swept through San Diego County on Friday, wreaking havoc on slick freeways and blanketing local mountains with the season’s first snow.

The California Highway Patrol reported that the rain contributed to at least 140 accidents on local freeways, most of them minor fender-benders. However, a tractor-trailer rig traveling on Interstate 5 in National City plowed into a line of stopped cars, sending two women--one of them pregnant--to UC San Diego Medical Center.

A car driven by Lori Dorsey, 24, of San Diego was the first vehicle hit by the rig, said CHP Officer Michael Burger. Dorsey’s car rammed the car in front, which then spun and hit a car in the next lane, CHP officials said.

A car driven by Acacia Ramirez, 20, and who is pregnant, also was hit in the chain reaction. Paramedics took Dorsey and Ramirez to UC San Diego Medical Center, where they were reported in fair condition Friday evening.

CHP officers said the women were sitting in their cars, which were stuck in a half-mile-long traffic jam caused by a minor accident involving seven cars. One witness told investigators the rig was traveling too fast when it came upon the stopped cars, and could not brake in time on the wet pavement.

More accidents seemed to follow in the shadow of each rain cloud passing overhead.

“There was an accident on every major freeway,” said CHP Officer Jackie Sturges. There were so many accidents at one time, there were not enough officers to respond to each one immediately, Sturges said.

Weather forecasters said that by 4 p.m. the storm had dumped 0.70 of an inch of rain in Campo and 0.41 of an inch at Lindbergh Field. It dropped about an inch and a half of snow at Mt. Laguna, said meteorologist Wilbur Shigehara of the National Weather Service.

Commuters will probably be greeted by another storm Monday that is expected to drop about half an inch of rain throughout the county, Shigehara said.

The National Weather Service issued a special snow advisory Friday night for the mountains of San Diego County.

“If you want to travel to the mountains, carry chains just in case. And be sure to bring enough warm clothing,” Shigehara said.

The weekend is expected to be partly cloudy, but temperatures are expected to dip into the high 40s in downtown San Diego and into the upper 30s inland.

Farmers around Pauma Valley, Bonsall and Escondido should also expect “a little frost,” Shigehara said.