National Weather Service Marine Forecast FZUS52 KJAX

FZUS52 KJAX 161929
CWFJAX

Coastal Waters Forecast for Northeast Florida/Southeast Georgia
National Weather Service Jacksonville FL
329 PM EDT Mon Mar 16 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.

AMZ400-171000
Synopsis for Altamaha Sound GA to Flagler Beach FL out to 60 nm
329 PM EDT Mon Mar 16 2026

SYNOPSIS

Small Craft Advisory conditions continue this afternoon ahead of a strong cold frontal boundary pushes into the local waters through late afternoon and exits to the east this evening. Strong to severe thunderstorms are forecast to impact our local waters through the reminder of this afternoon, with the potential for damaging wind gusts, waterspouts, and large hail. Winds will shift to westerly following the passage of the strong cold front, with strong northwesterly winds forecast tonight and Tuesday morning throughout our local waters with gale force gusts possible as high pressure builds into the southeastern states. Winds will shift to northerly on Tuesday afternoon and then northeasterly by Wednesday as high pressure shifts northeastward towards the Mid-Atlantic coast. This strengthening high pressure center will wedge down the southeastern seaboard later this week, creating another round of Small Craft Advisory conditions on Wednesday night and Thursday. Winds and seas are expected to diminish by Friday afternoon.

GULF STREAM

The approximate location of the west wall of the Gulf Stream as of Mar 16, 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. 68 nautical miles east southeast of St Simons Island.

This data derived from NCEP Global RTOFS model.

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AMZ450-452-454-171000
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
329 PM EDT Mon Mar 16 2026

SMALL CRAFT ADVISORY IN EFFECT THROUGH TUESDAY MORNING

TORNADO WATCH 70 IN EFFECT UNTIL 8 PM EDT THIS EVENING

TONIGHT
Northwest winds 25 to 30 knots, diminishing to 20 to 25 knots after midnight. Seas 5 to 7 feet, occasionally to 9 feet. Wave Detail: Northwest 6 feet at 5 seconds and south 4 feet at 6 seconds. Intracoastal waters very rough.

TUESDAY
Northwest winds 20 to 25 knots, diminishing to 10 to 15 knots in the afternoon. Seas 4 to 6 feet, occasionally to 8 feet, subsiding to 2 to 4 feet, occasionally to 5 feet in the afternoon. Wave Detail: North 6 feet at 5 seconds and southeast 2 feet at 8 seconds, becoming north 3 feet at 6 seconds and east 2 feet at 8 seconds. Intracoastal waters rough.

TUESDAY NIGHT
North winds 10 to 15 knots. Seas 2 to 3 feet. Wave Detail: North 3 feet at 5 seconds and east 2 feet at 8 seconds. Intracoastal waters a moderate chop.

WEDNESDAY
North winds 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: North 3 feet at 4 seconds and east 3 feet at 9 seconds. Intracoastal waters a moderate chop.

WEDNESDAY NIGHT THROUGH THURSDAY NIGHT
North winds 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: Northeast 4 feet at 5 seconds and east 3 feet at 9 seconds. Intracoastal waters choppy.

FRIDAY THROUGH SATURDAY
Southwest winds 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: South 3 feet at 4 seconds and northeast 3 feet at 7 seconds. Intracoastal waters choppy.

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AMZ470-472-474-171000
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
329 PM EDT Mon Mar 16 2026

SMALL CRAFT ADVISORY IN EFFECT THROUGH TUESDAY AFTERNOON

TONIGHT
Northwest winds 25 to 30 knots. Seas 6 to 8 feet, occasionally to 10 feet. Wave Detail: Northwest 7 feet at 6 seconds and south 5 feet at 7 seconds. A chance of showers and thunderstorms this evening.

TUESDAY
Northwest winds 20 to 25 knots, diminishing to 10 to 15 knots in the afternoon. Seas 5 to 7 feet, occasionally to 9 feet. Wave Detail: Northwest 7 feet at 6 seconds and southeast 3 feet at 8 seconds.

TUESDAY NIGHT
North winds 10 to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: North 3 feet at 6 seconds and east 3 feet at 8 seconds.

WEDNESDAY
North winds 10 to 15 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet at 9 seconds and north 3 feet at 5 seconds.

WEDNESDAY NIGHT
North winds 10 to 15 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet at 9 seconds and north 3 feet at 4 seconds.

THURSDAY
North winds 15 to 20 knots, diminishing to 10 to 15 knots in the afternoon. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: Northeast 4 feet at 5 seconds and east 4 feet at 9 seconds. A slight chance of showers.

THURSDAY NIGHT
North winds 10 to 15 knots. Seas 4 to 5 feet, occasionally to 6 feet.

FRIDAY THROUGH SATURDAY
Southwest winds 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet.

Winds and seas higher in and near thunderstorms.