Flood advisory issued for areas along river Jacksonville’s National Weather Service office has issued a Coastal Flood Advisory for low-lying areas along the city’s river and tributaries for this weekend and into early next week. Residents are encouraged to use caution when traveling in the San Marco, Southampton and Ortega neighborhoods, especially during high tides, due to the potential of road flooding. High tides are expected to occur at the Southbank Riverwalk at these times: ■ Saturday — 9:19 a.m.