National Weather Service Marine Forecast FZUS52 KJAX

FZUS52 KJAX 041249
CWFJAX

Coastal Waters Forecast for Northeast Florida/Southeast Georgia
National Weather Service Jacksonville FL
849 AM EDT Tue Aug 4 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.

AMZ400-050400
Synopsis for Altamaha Sound GA to Flagler Beach FL out to 60 nm
849 AM EDT Tue Aug 4 2026

SYNOPSIS

Frontal boundary will remain stalled north of the waters today and then dissipate on Wednesday. Offshore flow continues this morning with a shift to south-southeasterly this afternoon and evening in the wake of the pinned Atlantic sea breeze. High pressure ridge will build north of the waters by Wednesday with a return to a prevailing southeast onshore flow that will become easterly by Friday and Saturday.

GULF STREAM

The approximate location of the west wall of the Gulf Stream as of Aug 03, 2026 at 0000 UTC...

54 nautical miles east of Flagler Beach. 58 nautical miles east of Saint Augustine Beach. 70 nautical miles east southeast of Jacksonville Beach. 71 nautical miles east southeast of St Simons Island.

This data derived from NCEP Global RTOFS model.

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AMZ450-452-454-050400
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
849 AM EDT Tue Aug 4 2026

REST OF TODAY
Southwest winds 5 to 10 knots, becoming south 10 to 15 knots this afternoon. Seas 2 to 3 feet. Wave Detail: South 3 feet at 4 seconds and southeast 2 feet at 8 seconds. Intracoastal waters a moderate chop. A chance of showers and thunderstorms this afternoon.

TONIGHT
South winds 10 to 15 knots, becoming southwest 5 to 10 knots after midnight. Seas 2 to 3 feet. Wave Detail: South 3 feet at 4 seconds and southeast 3 feet at 7 seconds. Intracoastal waters a moderate chop. A chance of showers with a slight chance of thunderstorms in the evening.

WEDNESDAY
South winds 5 to 10 knots, becoming southeast 10 to 15 knots in the afternoon. Seas 2 to 3 feet. Wave Detail: Southeast 2 feet at 3 seconds and southeast 2 feet at 7 seconds. Intracoastal waters a moderate chop. A slight chance of showers and thunderstorms in the afternoon.

WEDNESDAY NIGHT
South winds 10 to 15 knots, diminishing to 5 to 10 knots after midnight. Seas 2 to 3 feet. Wave Detail: Southeast 2 feet at 4 seconds and southeast 2 feet at 7 seconds. Intracoastal waters a moderate chop. A slight chance of thunderstorms. A slight chance of showers in the evening, then a chance of showers after midnight.

THURSDAY
Southeast winds 5 to 10 knots. Seas around 2 feet. Wave Detail: Southeast 2 feet at 7 seconds. Intracoastal waters light chop. A chance of showers and thunderstorms, mainly in the morning.

THURSDAY NIGHT
Southeast winds 10 to 15 knots. Seas 2 to 3 feet. Wave Detail: Southeast 3 feet at 7 seconds. Intracoastal waters a moderate chop. A slight chance of showers and thunderstorms after midnight.

FRIDAY THROUGH SATURDAY
South winds 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Intracoastal waters a moderate chop. A chance of showers and thunderstorms.

Winds and waves higher in and near thunderstorms.

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AMZ470-472-474-050400
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. Augustine to Flagler Beach FL from 20 to 60 NM
849 AM EDT Tue Aug 4 2026

REST OF TODAY
Southwest winds 10 to 15 knots, becoming south this afternoon. Seas 2 to 3 feet. Wave Detail: Southeast 3 feet at 8 seconds and southwest 2 feet at 4 seconds. A slight chance of showers and thunderstorms this morning, then a chance of showers and thunderstorms this afternoon.

TONIGHT
South winds 10 to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: South 3 feet at 4 seconds and southeast 3 feet at 8 seconds. A slight chance of showers and thunderstorms.

WEDNESDAY
Southwest winds 5 to 10 knots, becoming southeast 10 to 15 knots in the afternoon. Seas 2 to 3 feet. Wave Detail: Southeast 3 feet at 7 seconds and south 2 feet at 4 seconds.

WEDNESDAY NIGHT
Southeast winds 10 to 15 knots, becoming south 5 to 10 knots after midnight. Seas 2 to 3 feet. Wave Detail: Southeast 3 feet at 7 seconds. A slight chance of showers and thunderstorms in the evening, then a chance of showers and thunderstorms after midnight.

THURSDAY
Southeast winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: Southeast 3 feet at 7 seconds. Showers likely with a chance of thunderstorms in the morning, then a slight chance of showers and thunderstorms in the afternoon.

THURSDAY NIGHT
Southeast winds 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: Southeast 3 feet at 7 seconds. A slight chance of showers and thunderstorms after midnight.

FRIDAY THROUGH SATURDAY
South winds 10 to 15 knots. Seas 3 to 5 feet, occasionally to 6 feet. A chance of showers and thunderstorms.

Winds and seas higher in and near thunderstorms.