* WHAT...South swell from 190 degrees with a period of 18 to 20 seconds will generate surf of 4 to 7 feet with sets up to 9 feet along south-facing beaches. High rip current risk. * WHERE...San Diego County Coastal Areas and Orange County Coastal Areas. * WHEN...From late Monday night through Thursday afternoon. * IMPACTS...Hazardous swimming conditions and a high rip current risk. If you become caught in a rip current, yell for help. Remain calm and do not exhaust yourself and stay afloat while waiting for help. If you have to swim out of a rip current, SWIM PARALLEL TO SHORE and back toward the beach when possible. Do not attempt to swim directly against a rip current as you will tire quickly. * ADDITIONAL DETAILS...Highest surf will be at south-facing beaches and peak Tuesday and Wednesday. Swell and surf will slowly subside beginning Thursday with a shorter period, but will remain elevated into Friday.