FZUS52 KJAX 150818 CWFJAX Coastal Waters Forecast for Northeast Florida/Southeast Georgia National Weather Service Jacksonville FL 418 AM EDT Thu Oct 15 2026 Atlantic Coastal Waters from Altamaha Sound GA to Flagler Beach FL out to 60 nm. Seas are provided as a range of the average height of the highest 1/3 of the waves, along with the occasional height of the average highest 1/10 of the waves. AMZ400-152330- Synopsis for Altamaha Sound GA to Flagler Beach FL out to 60 nm- 418 AM EDT Thu Oct 15 2026 .SYNOPSIS... High pressure will be over the area Today, then weaken Tonight into Friday. A cold front will move southeast across the area Friday night. Strong high pressure will build behind the front. A surge of north winds will move south down the coastal waters behind the front, with elevated winds from late Friday night through much of next week, with Gale force winds possible. .GULF STREAM... The approximate location of the west wall of the Gulf Stream as of Oct 14, 2026 at 0000 UTC... 50 nautical miles east of Flagler Beach. 53 nautical miles east of Saint Augustine Beach. 64 nautical miles east southeast of Jacksonville Beach. 71 nautical miles east southeast of St Simons Island. This data derived from NCEP Global RTOFS model. $$ AMZ450-452-454-152330- Coastal waters from Altamaha Sound to Fernandina Beach FL out 20 NM- Coastal waters from Fernandina Beach to St. Augustine FL out 20 NM- Coastal waters from St. Augustine to Flagler Beach FL out 20 NM- 418 AM EDT Thu Oct 15 2026 .TODAY...East winds around 5 knots, increasing to 5 to 10 knots this afternoon. Seas around 2 feet. Wave Detail: East 2 feet at 7 seconds. Intracoastal waters light chop. .TONIGHT...Southeast winds 5 to 10 knots, becoming south after midnight. Seas around 2 feet. Wave Detail: East 2 feet at 7 seconds. Intracoastal waters light chop. .FRIDAY...West winds around 5 knots, becoming southeast 10 to 15 knots in the afternoon. Seas around 2 feet. Wave Detail: East 2 feet at 7 seconds. Intracoastal waters a moderate chop. A chance of showers with a slight chance of thunderstorms in the afternoon. .FRIDAY NIGHT...South winds around 10 knots, becoming west 15 to 20 knots after midnight. Seas 2 to 3 feet. Wave Detail: South 2 feet at 3 seconds and southeast 2 feet at 7 seconds. Intracoastal waters choppy. A chance of showers and thunderstorms, mainly in the evening. .SATURDAY...North winds 25 to 30 knots. Seas 3 to 5 feet, occasionally to 6 feet, building to 5 to 8 feet, occasionally to 10 feet in the afternoon. Wave Detail: Northwest 5 feet at 5 seconds and east 2 feet at 9 seconds, becoming northeast 8 feet at 8 seconds and north 7 feet at 7 seconds. Intracoastal waters very rough. A chance of showers with a slight chance of thunderstorms. .SATURDAY NIGHT...Northeast winds 30 to 35 knots. Seas 7 to 10 feet, occasionally to 13 feet, building to 9 to 13 feet, occasionally to 17 feet after midnight. Wave Detail: North 10 feet at 7 seconds, becoming northeast 13 feet at 8 seconds. Intracoastal waters extremely rough. A slight chance of showers in the evening. .SUNDAY...Northeast winds 25 to 35 knots. Seas 10 to 14 feet, occasionally to 18 feet. Intracoastal waters extremely rough. A slight chance of showers in the morning, then a chance of showers through the night. A slight chance of showers after midnight. .MONDAY...Northeast winds 25 to 30 knots. Seas 9 to 13 feet, occasionally to 17 feet, subsiding to 8 to 11 feet, occasionally to 14 feet after midnight. Intracoastal waters very rough. A chance of showers . Winds and waves higher in and near thunderstorms. $$ AMZ470-472-474-152330- Waters from Altamaha Sound GA to Fernandina Beach FL from 20 to 60 NM- Waters from Fernandina Beach to St. Augustine FL from 20 to 60 NM- Waters from St. Augustineto Flagler Beach FL from 20 to 60 NM- 418 AM EDT Thu Oct 15 2026 .TODAY...East winds 5 to 10 knots. Seas around 2 feet. Wave Detail: East 2 feet at 7 seconds. .TONIGHT...East winds 5 to 10 knots, becoming south after midnight. Seas around 2 feet. Wave Detail: East 2 feet at 7 seconds. .FRIDAY...West winds around 5 knots, becoming south in the afternoon. Seas around 2 feet. Wave Detail: East 2 feet at 7 seconds. A slight chance of showers in the morning, then a chance of showers in the afternoon. .FRIDAY NIGHT...South winds 10 to 15 knots, becoming west 15 to 20 knots after midnight. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: Southwest 3 feet at 4 seconds and east 2 feet at 8 seconds. A chance of showers and thunderstorms. .SATURDAY...North winds 25 to 30 knots. Seas 4 to 6 feet, occasionally to 8 feet, building to 7 to 10 feet, occasionally to 13 feet in the afternoon. Wave Detail: Northwest 6 feet at 6 seconds and east 2 feet at 9 seconds, becoming north 9 feet at 7 seconds and east 9 feet at 9 seconds. A chance of showers with a slight chance of thunderstorms. .SATURDAY NIGHT...Northeast winds 30 to 35 knots with gusts up to 45 knots. Seas 9 to 12 feet, occasionally to 15 feet, building to 12 to 14 feet, occasionally to 18 feet after midnight. Wave Detail: North 12 feet at 8 seconds, becoming northeast 14 feet at 9 seconds. A slight chance of showers in the evening. .SUNDAY...Northeast winds 30 to 35 knots. Seas 12 to 15 feet, occasionally to 19 feet. A chance of showers . .MONDAY...Northeast winds 25 to 30 knots. Seas 11 to 13 feet, occasionally to 17 feet, subsiding to 10 to 11 feet, occasionally to 14 feet after midnight. A chance of showers . Winds and seas higher in and near thunderstorms. $$