A series of car accidents caused by rain-slicked roads closed all northbound lanes of Interstate 5 just south of Genesee Avenue about 9:20 p.m. Saturday, the California Highway Patrol reported.
CHP dispatcher Debbie Russell described the accidents as "small fender-benders" caused by a sudden rainstorm. Some motorists suffered injuries, but the extent was not known, Russell said.
Along with scattered showers and some hail reported in mountain areas, Miramar and San Marcos, cold northerly and northeasterly winds blew into the county Saturday night, National Weather Service forecaster Frank Perdue said. Winds are expected to rapidly diminish late tonight, with the strongest gusts up to 45 m.p.h. in the mountain areas, he said.
"This extremely cold air mass is the cause for the hail," Perdue said.
Overnight lows tonight are expected to drop to 23 degrees in Bonsall, 25 in Escondido, 24 in Valley Center, 27 in Pauma Valley, 26 in Fallbrook and 27 in San Pasqual.
Coastal highs today and Monday will range from 60 to 65, with lows around 40 both days.
Highs in the inland valleys will be 62 to 68 today with lows of 20 to 30. Mountain areas will have highs in the 34- to 46-degree range, with lows of 15 to 23 tonight. Desert highs will range from 56 to 64 and lows from 30 to 38.