577
FZUS52 KJAX 200108
CWFJAX

Coastal Waters Forecast for Northeast Florida/Southeast Georgia
National Weather Service Jacksonville FL
908 PM EDT Tue Aug 19 2025

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.

AMZ400-201615-
Synopsis for Altamaha Sound GA to Flagler Beach FL out to 60 nm-
908 PM EDT Tue Aug 19 2025

.SYNOPSIS...

High pressure positioned over coastal New England will continue to
wedge into the southeastern states as Hurricane Erin turns
northward tonight, remaining well east of the Gulf Stream waters
adjacent to our area. Breezy northeasterly winds will shift to
northerly by sunrise on Wednesday as powerful ocean swells
increase in frequency across our local waters. An extended period
of Small Craft conditions will continue through Thursday night
near shore and through Saturday offshore due to these lingering
swells. Erin will turn northeastward by late Thursday, allowing a
frontal boundary to push into the southeastern states and for
prevailing offshore winds to develop across our local waters. This
front will stall across the region Friday through the weekend,
bringing rounds of showers and thunderstorms to our area.


.GULF STREAM...

The approximate location of the west wall of the Gulf Stream as of
Aug 16, 2025 at 1200 UTC...

 57 nautical miles east of Flagler Beach.
 63 nautical miles east northeast of Saint Augustine Beach.
 68 nautical miles east of Jacksonville Beach.
 75 nautical miles east southeast of St Simons Island.

This data courtesy of the Naval Oceanographic Office.


$$

AMZ450-452-454-201615-
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-
908 PM EDT Tue Aug 19 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE THURSDAY NIGHT...

.REST OF TONIGHT...Northeast winds 15 to 20 knots, becoming
north northeast after midnight. Seas 6 to 9 feet, occasionally to
11 feet. Wave Detail: East 8 feet at 17 seconds and northeast 4
feet at 6 seconds. Intracoastal waters choppy. A chance of showers
with a slight chance of thunderstorms.
.WEDNESDAY...North winds 15 to 20 knots. Seas 7 to 10 feet,
occasionally to 13 feet. Wave Detail: East 9 feet at 15 seconds
and northeast 5 feet at 6 seconds. Intracoastal waters choppy. A
chance of showers and thunderstorms.
.WEDNESDAY NIGHT...Northwest winds around 10 knots. Seas 7 to 10
feet, occasionally to 13 feet. Wave Detail: East 9 feet at 15
seconds and northeast 4 feet at 8 seconds. Intracoastal waters a
light chop.
.THURSDAY...Northwest winds 5 to 10 knots, becoming southeast
around 10 knots in the afternoon. Seas 6 to 8 feet, occasionally
to 10 feet. Wave Detail: East 8 feet at 14 seconds and southeast 2
feet at 7 seconds. Intracoastal waters a light chop. A chance of
showers and thunderstorms in the afternoon.
.THURSDAY NIGHT...South winds 5 to 10 knots, becoming west after
midnight. Seas 5 to 6 feet, occasionally to 8 feet. Wave Detail:
East 6 feet at 13 seconds and southeast 2 feet at 6 seconds.
Intracoastal waters mostly smooth. A chance of showers and
thunderstorms, mainly in the evening.
.FRIDAY...Southwest winds 5 to 10 knots, becoming southeast around
10 knots in the afternoon. Seas 4 to 6 feet, occasionally to 8
feet. Wave Detail: Northeast 5 feet at 13 seconds and southeast 2
feet at 6 seconds. Intracoastal waters becoming a light chop.
Showers and thunderstorms likely in the afternoon.
.FRIDAY NIGHT...South winds 5 to 10 knots, becoming southwest
after midnight. Seas 3 to 5 feet, occasionally to 6 feet.
Intracoastal waters mostly smooth. Showers and thunderstorms
likely, mainly in the evening.
.SATURDAY...Southwest winds 5 to 10 knots, becoming southeast
around 10 knots in the afternoon. Seas 3 to 5 feet, occasionally
to 6 feet. Intracoastal waters becoming a light chop. Showers and
thunderstorms likely.
.SATURDAY NIGHT AND SUNDAY...Southwest winds 5 to 10 knots. Seas
3 to 5 feet, occasionally to 6 feet. Intracoastal waters mostly
smooth. Showers and thunderstorms likely.

Winds and waves higher in and near thunderstorms.

$$

AMZ470-472-474-201615-
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-
908 PM EDT Tue Aug 19 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH SATURDAY MORNING...

.REST OF TONIGHT...Northeast winds 15 to 20 knots, becoming north
northeast after midnight. Seas 8 to 11 feet, occasionally to 14
feet. Wave Detail: Southeast 10 feet at 17 seconds and northeast
4 feet at 7 seconds. Showers likely with a chance of
thunderstorms.
.WEDNESDAY...North winds 15 to 20 knots. Seas 9 to 13 feet,
occasionally to 17 feet. Wave Detail: Southeast 11 feet at 15
seconds and north 5 feet at 7 seconds. Showers likely with a
chance of thunderstorms.
.WEDNESDAY NIGHT...Northwest winds around 15 knots. Seas 9 to 13
feet, occasionally to 17 feet. Wave Detail: East 12 feet at 15
seconds and northeast 5 feet at 8 seconds. A chance of showers
with a slight chance of thunderstorms.
.THURSDAY...Northwest winds 10 to 15 knots, becoming southwest
5 to 10 knots in the afternoon. Seas 7 to 9 feet, occasionally to
11 feet. Wave Detail: East 9 feet at 13 seconds and north 3 feet
at 9 seconds. A slight chance of showers and thunderstorms in the
morning, then a chance of showers and thunderstorms in the
afternoon.
.THURSDAY NIGHT...Southwest winds 5 to 10 knots, becoming west
after midnight. Seas 6 to 8 feet, occasionally to 10 feet. Wave
Detail: Northeast 7 feet at 13 seconds and southeast 2 feet at
6 seconds. A chance of showers and thunderstorms.
.FRIDAY AND FRIDAY NIGHT...Southwest winds 5 to 10 knots. Seas
5 to 8 feet, occasionally to 10 feet. Wave Detail: Northeast 7
feet at 13 seconds and southeast 2 feet at 6 seconds. Showers and
thunderstorms likely.
.SATURDAY...Southwest winds 5 to 10 knots. Seas 5 to 7 feet,
occasionally to 9 feet. Showers and thunderstorms likely.
.SATURDAY NIGHT AND SUNDAY...West winds 5 to 10 knots. Seas 4 to 6
feet, occasionally to 8 feet. Showers and thunderstorms likely.

Winds and seas higher in and near thunderstorms.

$$