SAN DIEGO — A mild, slow-moving winter storm doused the San Diego area with intermittent downpours Tuesday, dropping anywhere from two-fifths of an inch to 1 3/4 inches of rainfall across the county.

The round of cloudbursts, which began Monday evening, were expected to continue through late Wednesday, the National Weather Service reported.

A slow-moving Pacific storm system is behind the heavy rainfall, which caused flooding in areas of San Diego and prompted several accidents on local freeways. 

Tuesday afternoon, a pileup involving more than a dozen vehicles on a rain-slick stretch of Interstate 5 in the Torrey Pines area left seven people injured and closed the southbound side of the freeway for about an hour.

The series of chain-reaction collisions near Carmel Valley Road happened shortly before 2 p.m., according to the California Highway Patrol. A total of 13 to 15 vehicles were involved, officials said.

Medics took the injured to Scripps Memorial Hospital La Jolla for treatment of minor to moderately serious trauma, the San Diego Fire-Rescue Department reported.

The southbound side of the freeway in the area was closed into the mid- afternoon due to the spate of rainy-day crashes, according to Caltrans. 

Early Tuesday morning, El Cajon police responded to a downed power line in the area of 1600 E. Madison that caused the power to go out to one house. Crews reopened the road around 6 a.m. San Diego Gas & Electric remained on scene to remove the downed line. 

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As of late this afternoon, the showers had dropped 1.76 inches of moisture on Mount Laguna; 1.33 in Julian; 1.16 in Fallbrook; 0.97 in Encinitas and San Marcos; 0.78 in Poway; and 0.76 in Carlsbad.

Other precipitation totals included 0.7 of an inch in Rancho San Diego; 0.69 in San Pasqual Valley; 0.68 in Rancho Bernardo; 0.62 in Alpine; 0.6 in Ocotillo Wells; 0.59 in Santee; 0.53 in the Miramar area; 0.5 in El Cajon; 0.49 at Lindbergh Field and in Lemon Grove; 0.48 in Del Mar; 0.46 in La Mesa; 0.39 at Brown Field Municipal Airport; 0.38 in Serra Mesa; 0.35 in National City; and 0.28 in Chula Vista.

A follow-up period of wet weather is expected Thursday into early Friday, with some light rains possible over the weekend. Thereafter, a low- pressure system from the north will bring greater chances for more significant precipitation early next week, meteorologists advised.