Expires:202411221115;;445703 FZUS52 KCHS 212255 CWFCHS Coastal Waters Forecast National Weather Service Charleston SC 555 PM EST Thu Nov 21 2024 South Santee River SC to Savannah GA out 20 NM and Savannah GA to Altamaha Sound GA out 60 NM, including Charleston Harbor and Grays Reef National Marine Sanctuary AMZ300-221115- 555 PM EST Thu Nov 21 2024 .Synopsis for the coastal waters of south coastal South Carolina and north coastal Georgia... Canadian high pressure will build across the area tonight and will remain the primary feature through early next week. A cold front could approach the area towards the middle of next week. $$