Widespread showers prevailed in the county through the morning, then dwindled around midday, making way for dry and partly sunny skies in many locales, according to the National Weather Service.
Over a 24-hour period ending at 3 p.m., the dark cloud banks dropped 1.04 inches of precipitation in Julian, 0.71 of an inch in Rancho Bernardo, 0.57 in Serra Mesa, 0.41 in downtown San Diego, 0.39 in Encinitas and 0.21 in Otay Mesa, the NWS reported.
No mountain snowfall had been reported by mid-afternoon, meteorologist Mark Moede said.
As usual, the downpours ushered in hours of roadway problems far and wide. Between midnight and 1 p.m., the California Highway Patrol logged 109 traffic accidents on the county's freeways and rural routes.
By comparison, the agency typically responds to 50-75 crashes during a full day of fair weather.
A second, more frigid atmospheric pattern is expected to arrive this evening and will likely generate heavier rain through Saturday, according to the Weather Service.
The potential intensity of the predicted cloudbursts prompted the federal agency to issue a flash-flood watch for the region, effective from 4 p.m. today through Saturday afternoon.
The unsettled conditions also could generate lightning and ocean funnel clouds, the NWS advised.
"It's a pretty vigorous little cold front coming across the region," Moede said.
The storm likely will dissipate Sunday, but yet another one could bring more showers Monday and early Tuesday before fair weather returns to the region, according to forecasters.