National Weather Service Marine Forecast FZUS52 KJAX

FZUS52 KJAX 190914
CWFJAX

Coastal Waters Forecast for Northeast Florida/Southeast Georgia
National Weather Service Jacksonville FL
514 AM EDT Sat Sep 19 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.

AMZ400-200015
Synopsis for Altamaha Sound GA to Flagler Beach FL out to 60 nm
514 AM EDT Sat Sep 19 2026

SYNOPSIS

A surface trough and disturbance aloft moving slowly westward across the Florida peninsula this morning will emerge over the southeast Gulf this afternoon. Widely scattered showers and possibly a few thunderstorms should remain confined to the waters from around St. Augustine southward today, with coverage then slowly increasing throughout our local waters after midnight on Saturday night and Sunday. Scattered to numerous showers and thunderstorms are then expected early next week as the disturbance aloft moves slowly r northeastward across our area. East to northeasterly winds will otherwise prevail through the early portions of next week, with speeds and seas remaining below Caution levels. Strong high pressure building over southeastern Canada and New England towards the middle portion of next week will then wedge down the southeastern seaboard, resulting in surge of northeasterly winds that will likely bring Small Craft Advisory conditions to our local waters beginning later on Wednesday and continuing through the late portions of next week.

GULF STREAM

The approximate location of the west wall of the Gulf Stream as of Sep 18, 2026 at 0000 UTC...

50 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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AMZ450-452-454-200015
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
514 AM EDT Sat Sep 19 2026

TODAY
North winds 5 to 10 knots, becoming east northeast 10 to 15 knots late this morning. Seas 2 to 3 feet. Wave Detail: East 2 feet at 7 seconds. Intracoastal waters becoming a light chop. A slight chance of showers and thunderstorms.

TONIGHT
East winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: East 2 feet at 7 seconds. Intracoastal waters mostly smooth. A chance of showers and thunderstorms, mainly after midnight.

SUNDAY
North winds 5 to 10 knots, becoming east northeast around 10 knots late in the morning. Seas around 2 feet. Wave Detail: East 2 feet at 7 seconds and east 2 feet at 11 seconds. Intracoastal waters becoming a light chop. A chance of showers and thunderstorms.

SUNDAY NIGHT
East around 10 knots, becoming east southeast around 5 knots after midnight. Seas around 2 feet. Wave Detail: East 2 feet at 8 seconds and east 2 feet at 11 seconds. Intracoastal waters becoming smooth. A chance of showers and thunderstorms.

MONDAY
Northeast winds 5 to 10 knots. Seas around 2 feet. Wave Detail: East 2 feet at 8 seconds. Intracoastal waters mostly smooth. A chance of showers and thunderstorms.

MONDAY NIGHT
East winds 5 to 10 knots, becoming southeast around 5 knots after midnight . Seas around 2 feet. Wave Detail: East 2 feet at 8 seconds. Intracoastal waters becoming smooth. A chance of showers and thunderstorms.

TUESDAY
North winds 5 to 10 knots, becoming east northeast around 10 knots during the afternoon. Seas around 2 feet. Intracoastal waters becoming a light chop. Showers likely with a chance of thunderstorms.

TUESDAY NIGHT
East winds 5 to 10 knots, becoming north northwest after midnight. Seas around 2 feet. Intracoastal waters mostly smooth. A chance of showers with a slight chance of thunderstorms.

WEDNESDAY
North winds around 10 knots, becoming northeast and increasing to around 15 knots during the afternoon. Seas building to 3 to 4 feet. Showers likely with a chance of thunderstorms.

Winds and waves higher in and near thunderstorms.

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AMZ470-472-474-200015
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
514 AM EDT Sat Sep 19 2026

TODAY
East northeast winds around 10 knots, becoming east around 15 knots late this afternoon. Seas 2 to 3 feet. Wave Detail: East 2 feet at 7 seconds. A slight chance of showers and thunderstorms.

TONIGHT
East winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: Southeast 2 feet at 7 seconds and east 2 feet at 8 seconds. A chance of showers with a slight chance of thunderstorms.

SUNDAY
Northeast winds 5 to 10 knots. Seas around 2 feet. Wave Detail: East 2 feet at 7 seconds and east 2 feet at 11 seconds. A chance of showers and thunderstorms.

SUNDAY NIGHT
East winds 5 to 10 knots. Seas around 2 feet. Wave Detail: East 2 feet at 10 seconds. A chance of showers and thunderstorms.

MONDAY
Northeast winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: Southeast 2 feet at 8 seconds and east 2 feet at 8 seconds. Showers likely with a chance of thunderstorms.

MONDAY NIGHT
East southeast winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: Southeast 2 feet at 8 seconds and northeast 2 feet at 8 seconds. Showers likely with a chance of thunderstorms.

TUESDAY
Northeast winds 5 to 10 knots. Seas 2 to 3 feet. Showers likely with a chance of thunderstorms.

TUESDAY NIGHT
Southeast winds 5 to 10 knots, becoming north northwest around 10 knots after midnight. Seas 2 to 3 feet. A chance of showers and thunderstorms.

WEDNESDAY
North winds 10 to 15 knots, becoming northeast around 15 knots during the afternoon. Seas building to 3 to 4 feet. Showers likely with a chance of thunderstorms.

Winds and seas higher in and near thunderstorms.