* WHAT...For the Coastal Flood Warning, significant coastal flooding. For the Coastal Flood Advisory, minor coastal flooding expected. * WHERE...San Diego County Coastal Areas and Orange County Coastal Areas. * WHEN...For the Coastal Flood Warning, until 1 PM PDT Thursday. For the Coastal Flood Advisory, from 1 PM Thursday to 2 PM PDT Friday. * IMPACTS...Numerous roads may be closed. Low lying property including homes, businesses, and some critical infrastructure will be inundated. Some shoreline erosion will occur. * ADDITIONAL DETAILS...Coastal residents and managers of infrastructure in the warned/advisory area should prepare for rising water and take appropriate action to protect life and property. Highest tides will occur around 11 AM on Thursday and noon on Friday. Observed high tides are 1.4 to 1.6 feet above astronomical tide predictions. Take the necessary actions to protect flood-prone property. If travel is required, do not drive around barricades or through water of unknown depth.