FZUS52 KJAX 210624 CWFJAX Coastal Waters Forecast for Northeast Florida/Southeast Georgia National Weather Service Jacksonville FL 224 AM EDT Tue Apr 21 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. AMZ400-212100- Synopsis for Altamaha Sound GA to Flagler Beach FL out to 60 nm- 224 AM EDT Tue Apr 21 2026 .SYNOPSIS... Winds and waves subside gradually tonight with exercise caution over the offshore Florida waters through late morning as high pressure builds across the area waters today. Easterly winds Today will return Wednesday as high pressure remains over the waters with southerly winds overnight due to the land breeze. Winds will turn more southeasterly Thursday into Friday during the daytime's seabreeze circulation with southerly winds prevailing ahead of a cold front Saturday and southwesterly on Sunday as the front begins to stall just north of the waters. The front will bring increasing chances for showers and thunderstorms over the waters this weekend. .GULF STREAM... The approximate location of the west wall of the Gulf Stream as of Apr 20, 2026 at 0000 UTC... 54 nautical miles east of Flagler Beach. 62 nautical miles east of Saint Augustine Beach. 74 nautical miles east southeast of Jacksonville Beach. 80 nautical miles east southeast of St Simons Island. This data derived from NCEP Global RTOFS model. $$ AMZ450-452-454-212100- Coastal waters from Altamaha Sound to Fernandina Beach FL out 20 NM- Coastal waters from Fernandina Beach to St. Augustine FL out 20 NM- Coastal waters from St. Augustine to Flagler Beach FL out 20 NM- 224 AM EDT Tue Apr 21 2026 .REST OF TONIGHT...Northeast winds 5 to 10 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: Northeast 5 feet at 8 seconds. Intracoastal waters light chop. .TUESDAY...North winds 5 to 10 knots, becoming east in the afternoon. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet at 8 seconds. Intracoastal waters light chop. .TUESDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 8 seconds. Intracoastal waters light chop. .WEDNESDAY...Northeast winds around 5 knots, becoming east in the afternoon. Seas 2 to 3 feet. Wave Detail: East 3 feet at 8 seconds. Intracoastal waters light chop. .WEDNESDAY NIGHT...South winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: East 3 feet at 8 seconds. Intracoastal waters light chop. .THURSDAY AND THURSDAY NIGHT...South winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: East 3 feet at 7 seconds and southeast 2 feet at 3 seconds. Intracoastal waters light chop. .FRIDAY...South winds 10 to 15 knots. Seas 2 to 3 feet. Intracoastal waters a moderate chop. .SATURDAY...South winds 10 to 15 knots. Seas 2 to 3 feet. Intracoastal waters a moderate chop. A slight chance of showers and thunderstorms in the afternoon. A chance of showers in the evening, then a slight chance of showers after midnight. Winds and waves higher in and near thunderstorms. $$ AMZ472-212100- Waters from Fernandina Beach to St. Augustine FL from 20 to 60 NM- 224 AM EDT Tue Apr 21 2026 ...SMALL CRAFT EXERCISE CAUTION IN EFFECT UNTIL 8 AM EDT THIS MORNING... .REST OF TONIGHT...Northeast winds 5 to 10 knots. Seas 5 to 6 feet, occasionally to 8 feet. Wave Detail: Northeast 6 feet at 8 seconds. .TUESDAY...Northeast winds 5 to 10 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: Northeast 5 feet at 8 seconds. .TUESDAY NIGHT...East winds 5 to 10 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast 4 feet at 8 seconds. .WEDNESDAY...Eastwinds around 5 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast 4 feet at 8 seconds. .WEDNESDAY NIGHT THROUGH THURSDAY NIGHT...South winds 5 to 10 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast 4 feet at 8 seconds and southeast 2 feet at 3 seconds. .FRIDAY...South winds 5 to 10 knots, increasing to 10 to 15 knots. Seas 2 to 3 feet. Wave Detail: Southeast 3 feet at 4 seconds and southeast 3 feet at 8 seconds. .SATURDAY...South winds 10 to 15 knots, becoming southwest 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. A slight chance of showers in the afternoon. A slight chance of thunderstorms through the night. A chance of showers in the evening, then a slight chance of showers after midnight. Winds and seas higher in and near thunderstorms. $$ AMZ470-212100- Waters from Altamaha Sound GA to Fernandina Beach FL from 20 to 60 NM- 224 AM EDT Tue Apr 21 2026 .REST OF TONIGHT...West winds around 5 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 8 seconds. .TUESDAY...Northwest winds 5 to 10 knots, becoming northeast in the afternoon. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 8 seconds. .TUESDAY NIGHT...East winds 5 to 10 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 8 seconds. .WEDNESDAY...Northeast winds around 5 knots, becoming southeast around 5 knots in the afternoon. Seas around 3 feet. Wave Detail: East 3 feet at 8 seconds. .WEDNESDAY NIGHT THROUGH THURSDAY NIGHT...South winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: East 3 feet at 8 seconds and south 2 feet at 3 seconds. .FRIDAY...South winds 5 to 10 knots, increasing to 10 to 15 knots. Seas 2 to 3 feet. Wave Detail: South 3 feet at 5 seconds and southeast 3 feet at 8 seconds. .SATURDAY...South winds 10 to 15 knots, becoming southwest 15 to 20 knots. Seas 2 to 3 feet. A slight chance of showers in the afternoon. A slight chance of thunderstorms through the night. A chance of showers through the night. Winds and seas higher in and near thunderstorms. $$ AMZ474-212100- Waters from St. Augustine to Flagler Beach FL from 20 to 60 NM- 224 AM EDT Tue Apr 21 2026 ...SMALL CRAFT EXERCISE CAUTION IN EFFECT UNTIL NOON EDT TODAY... .REST OF TONIGHT...Northeast winds 10 to 15 knots. Seas 5 to 6 feet, occasionally to 8 feet. Wave Detail: Northeast 6 feet at 8 seconds. .TUESDAY...Northeast winds 10 to 15 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: Northeast 5 feet at 8 seconds. .TUESDAY NIGHT...East winds 5 to 10 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: Northeast 4 feet at 8 seconds. .WEDNESDAY...East winds 5 to 10 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast 4 feet at 8 seconds. .WEDNESDAY NIGHT THROUGH THURSDAY NIGHT...South winds 5 to 10 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast 4 feet at 8 seconds and southeast 2 feet at 3 seconds. .FRIDAY...South winds 5 to 10 knots, increasing to 10 to 15 knots. Seas 2 to 3 feet. Wave Detail: Southeast 3 feet at 8 seconds and southeast 2 feet at 4 seconds. .SATURDAY...South winds 10 to 15 knots, becoming southwest 15 to 20 knots. Seas 2 to 3 feet. A slight chance of showers and thunderstorms in the evening. A slight chance of showers after midnight. Winds and seas higher in and near thunderstorms. $$