The first fall storm in Southern California dumped less than an inch of rain in most of San Diego County before beginning to make its way out of the region Thursday. Only Palomar Mountain got a heavy dousing.
North County San Diego awoke to wet roadways and some light sprinkles but the majority of the received rainfall fell overnight. The storm system was weak and began to break up as it moved into the North County San Diego area, NBC 7 weathercaster Llarisa Abreu said.
As of 11 a.m. Thursday, Encinitas had received .63 inches of rain and Del Mar and Carlsbad had received just over a half-inch, according to the National Weather Service.
The rainfall was enough for the county's Department of Environmental Health to issue a rain advisory for the coastal waters in Del Mar, Solana Beach and Encinitas.
The rain brings an increase in bacteria levels, especially near storm drains, rivers and lagoons, from animal waste, soil and decomposing vegetation, according to the agency.
"Activities such as swimming, surfing and diving should be avoided for 72 hours following rain, the DEH said.
No warning signs will be posted for rain advisories, the agency said.
Elsewhere in the county, San Marcos and Escondido received more than .4 inches of rain. Kearny Mesa received less than a tenth of an inch of rain, according to the NWS.
Inland valleys, such as Ramona and Poway received around .15 inches of rain. Palomar Mountain area received more than an inch of rain and no rain was recorded in the deserts, NWS said.
The first significant rain of the season was creating slick roadways for early commuters. The NWS warned motorists should use extra caution.
"Give yourself some extra time and commute with greater caution and patience this morning. Showers have made a lot of roads wet out there," the agency shared on Twitter.
The system was heading east early Thursday and was expected to be out of San Diego County entirely by this evening, according to forecasters. It wasn’t expected to bring much, if any, showers to the mountains before moving out of the region.
Cool conditions were expected to last through the weekend, though chances for more showers were slim.