Hernando County is expecting a Significant Fog Event from late tonight until noon Friday. Areas of dense sea fog continue across the marine zones of the eastern Gulf of Mexico. The dense fog is expected to expand in coverage this evening, moving all the way to shore and throughout the waters of the Tampa Bay area. Once the fog develops a prolonged period of reduced visibility is likely through the overnight and into at least Friday morning. A cold front passing through the region Friday evening and Friday night will end the threat for sea fog.