* WHAT. For the Coastal Flood Advisory, up to one half foot of inundation above ground level expected in low lying areas due to tidal flooding. For the Coastal Flood Watch, up to one foot of inundation above ground level possible in low lying areas due to tidal flooding. * WHERE. Shoreline in St. Marys County. * WHEN. For the Coastal Flood Advisory, from 9 PM this evening to 2 PM EDT Saturday, especially around the time of high tide. For the Coastal Flood Watch, from Saturday evening through Sunday morning, especially around the time of high tide. * IMPACTS. At 3.5 feet, water covers roads on Saint George Island, is in yards, and is approaching structures. To the east, inundation is occurring at multiple marinas off St. Mary's River, Smith Creek, and Jutland Creek. * ADDITIONAL DETAILS. Tides one to two feet above normal. High tide tonight at Piney Point is at 11:20 PM. High tide Saturday is at 11:50 AM and high tide late Saturday night is at 12:15 AM. High tide late tonight at Point lookout is at 10:24 PM and high tide Saturday is at 10:47 AM and 11:22 PM for Saturday night. High tide late tonight at Coltons Point is at 11:56 PM and high tide Saturday is at 12:26 PM. High tide late Saturday night is at 12:51 AM.