* WHAT...Large breaking waves of 5 to 8 feet, with sets to 10 feet at west-facing beaches. * WHERE...San Diego County Coastal Areas and Orange County Coastal Areas. * WHEN...From 10 AM Friday to 6 AM PST Sunday. * IMPACTS...Dangerous swimming and surfing conditions and localized beach erosion. High rip current risk. Minor tidal overflow into parking lots also possible. * ADDITIONAL DETAILS...Rip currents are powerful channels of water flowing quickly away from shore...which occur most often at low spots or breaks in the sandbar and in the vicinity of structures such as groins...jetties and piers. Heed the advice of lifeguards...beach patrol flags and signs.