* WHAT...For the Coastal Flood Warning, significant coastal flooding. For the Coastal Flood Advisory, minor coastal flooding expected. * WHERE...St Johns River Basin. * WHEN...For the Coastal Flood Warning, until 5 PM EDT Thursday. For the Coastal Flood Advisory, from 5 PM Thursday to 2 PM EDT Saturday. * 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... Greatest impacts will be expected at times of high tide. Take the necessary actions to protect flood-prone property. If travel is required, do not drive around barricades or through water of unknown depth.