855
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.

$$

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.

$$

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.

$$