SAN DIEGO (CNS) - The National Weather Service issued a flood advisory for San Diego's East County and North County Saturday as rain and thunderstorms soaked the mountains and deserts.

The urban and small stream flood advisory was issued at 1:53 p.m. Saturday for East County mountain and desert communities and was to be in effect until 5 p.m. Saturday. The NWS said brief, heavy rain in the mountains Saturday caused ponds of water and shallow streams of water flowing across roadways.

The CHP reported moderate to heavy rain on State Route 76 near East Grade Road in Santa Ysabel near Lake Henshaw.

The NWS said the heaviest storms about 2 p.m. were in Campo and near Lake Morena along State Route 94. The agency announced about 2:30 p.m. the storms in those areas had weakened, but storms in the areas near Pine Valley and Laguna Summit near Interstate 8 had strengthened, as had the storm in Santa Ysabel.

The NWS said the storms are being caused by Hurricane Norbert, a Category 3 hurricane off the Pacific coast of Baja California Sur that was expected to send a 4-6 foot swell to county beaches Sunday. Deep tropical moisture being drawn northward around the storm was causing the rain and thunderstorms.

San Diego County mountains and deserts were expected be under a flash flood watch from early Sunday morning through Monday evening.

The NWS also issued abeach hazard warning, and said the elevated surf and large tidal swings would result in strong and dangerous rip and long shore currents at county beaches through late Monday.

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Hurricane Norbert bringing high surf to SD beaches