541
FZUS52 KJAX 210538
CWFJAX

Coastal Waters Forecast for Northeast Florida/Southeast Georgia
National Weather Service Jacksonville FL
138 AM EDT Thu Aug 21 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.

AMZ400-212200-
Synopsis for Altamaha Sound GA to Flagler Beach FL out to 60 nm-
138 AM EDT Thu Aug 21 2025

.SYNOPSIS...

Lingering swells from Hurricane Erin will continue small craft
advisory conditions this morning for all local waters, and through
through Friday for the outer waters. Prevailing westerly flow is
expected into the weekend as a surface trough approaches from the
north late tonight. The front lingers across the local waters
through the weekend brining an increase in shower and thunderstorm
activity.

.GULF STREAM...

The approximate location of the west wall of the Gulf Stream as of
Aug 19, 2025 at 1200 UTC...

 51 nautical miles east of Flagler Beach.
 59 nautical miles east of Saint Augustine Beach.
 68 nautical miles east of Jacksonville Beach.
 81 nautical miles east southeast of St Simons Island.

This data courtesy of the Naval Oceanographic Office.


$$

AMZ450-212200-
Coastal waters from Altamaha Sound to Fernandina Beach FL out
20 NM-
138 AM EDT Thu Aug 21 2025

.TODAY...Northwest winds 5 to 10 knots, becoming southeast this
afternoon. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail:
East 5 feet at 15 seconds and southeast 2 feet at 7 seconds.
Intracoastal waters light chop. A chance of showers with a slight
chance of thunderstorms this afternoon.
.TONIGHT...Southwest winds 5 to 10 knots. Seas 2 to 4 feet,
occasionally to 5 feet. Wave Detail: East 4 feet at 12 seconds
and southeast 2 feet at 7 seconds. Intracoastal waters light
chop. A chance of showers. A chance of thunderstorms, mainly in
the evening.
.FRIDAY...West winds around 5 knots, becoming southeast in the
afternoon. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail:
East 4 feet at 12 seconds and southeast 2 feet at 6 seconds.
Intracoastal waters light chop. A chance of showers with a slight
chance of thunderstorms in the morning, then showers and
thunderstorms likely in the afternoon.
.FRIDAY NIGHT...Southeast winds 5 to 10 knots, becoming southwest
after midnight. Seas 2 to 4 feet, occasionally to 5 feet. Wave
Detail: East 3 feet at 13 seconds and southeast 2 feet at
6 seconds. Intracoastal waters light chop. Showers with
thunderstorms likely in the evening, then showers likely with a
chance of thunderstorms after midnight.
.SATURDAY...North winds 5 to 10 knots, becoming east in the
afternoon. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail:
East 3 feet at 14 seconds and southeast 2 feet at 7 seconds.
Intracoastal waters light chop. Showers likely with a chance of
thunderstorms in the morning, then showers with thunderstorms
likely in the afternoon.
.SATURDAY NIGHT...South winds 5 to 10 knots, becoming west after
midnight. Seas 2 to 3 feet. Wave Detail: East 3 feet at
13 seconds and southeast 2 feet at 6 seconds. Intracoastal waters
light chop. Showers likely with a chance of thunderstorms in the
evening, then a chance of showers with a slight chance of
thunderstorms after midnight.
.SUNDAY...West winds 5 to 10 knots. Seas 2 to 3 feet.
Intracoastal waters light chop. A chance of showers and
thunderstorms in the morning, then showers and thunderstorms
likely in the afternoon. A chance of thunderstorms in the
evening. A chance of showers through the night. A slight chance
of thunderstorms after midnight.
.MONDAY...West winds 5 to 10 knots. Seas around 2 feet.
Intracoastal waters light chop. A slight chance of thunderstorms
in the morning. A chance of showers through the day. A chance of
thunderstorms in the afternoon, then a slight chance of showers
and thunderstorms in the evening.

Winds and waves higher in and near thunderstorms.

$$

AMZ452-454-212200-
Coastal waters from Fernandina Beach to St. Augustine FL out
20 NM-
Coastal waters from St. Augustine to Flagler Beach FL out 20 NM-
138 AM EDT Thu Aug 21 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS AFTERNOON...

.TODAY...West winds 5 to 10 knots, becoming southeast this
afternoon. Seas 4 to 7 feet, occasionally to 8 feet early this
morning. Wave Detail: East 5 feet at 15 seconds and southeast 2
feet at 7 seconds. Intracoastal waters light chop. A chance of
showers and thunderstorms this afternoon.
.TONIGHT...Southwest winds 5 to 10 knots. Seas 3 to 5 feet,
occasionally to 6 feet. Wave Detail: East 5 feet at 12 seconds
and southeast 2 feet at 7 seconds. Intracoastal waters light
chop. A chance of showers and thunderstorms, mainly in the
evening.
.FRIDAY...Southwest winds 5 to 10 knots, becoming southeast in
the afternoon. Seas 3 to 4 feet, occasionally to 5 feet. Wave
Detail: Northeast 4 feet at 12 seconds and southeast 2 feet at
6 seconds. Intracoastal waters light chop. A chance of showers
with a slight chance of thunderstorms in the morning, then
showers and thunderstorms likely in the afternoon.
.FRIDAY NIGHT...South winds 5 to 10 knots, becoming southwest
after midnight. Seas 3 to 4 feet, occasionally to 5 feet. Wave
Detail: Northeast 4 feet at 13 seconds and southeast 2 feet at
6 seconds. Intracoastal waters light chop. Showers likely with a
chance of thunderstorms in the evening, then a chance of showers
with a slight chance of thunderstorms after midnight.
.SATURDAY...West winds 5 to 10 knots, becoming south in the
afternoon. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail:
Northeast 4 feet at 14 seconds and southeast 2 feet at 6 seconds.
Intracoastal waters light chop. Showers likely with a chance of
thunderstorms in the morning, then showers with thunderstorms
likely in the afternoon.
.SATURDAY NIGHT...Southwest winds 5 to 10 knots. Seas 3 to
4 feet, occasionally to 5 feet. Wave Detail: Northeast 4 feet at
13 seconds and southeast 2 feet at 6 seconds. Intracoastal waters
light chop. Showers likely with a chance of thunderstorms in the
evening, then a chance of showers with a slight chance of
thunderstorms after midnight.
.SUNDAY...West winds 5 to 10 knots. Seas 2 to 4 feet,
occasionally to 5 feet. Intracoastal waters light chop. A chance
of thunderstorms in the morning. Showers through the day.
Thunderstorms likely in the afternoon, then a chance of
thunderstorms in the evening. A chance of showers through the
night. A slight chance of thunderstorms after midnight.
.MONDAY...West winds 5 to 10 knots. Seas 2 to 3 feet.
Intracoastal waters light chop. A chance of showers and
thunderstorms through the day, then a slight chance of
thunderstorms in the evening. A slight chance of showers through
the night.

Winds and waves higher in and near thunderstorms.

$$

AMZ470-472-474-212200-
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-
138 AM EDT Thu Aug 21 2025

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

.TODAY...Northwest winds 10 to 15 knots, becoming south 5 to
10 knots this afternoon. Seas 6 to 8 feet, occasionally to 9
feet. Wave Detail: East 7 feet at 14 seconds and southeast 3 feet
at 7 seconds. A chance of showers with a slight chance of
thunderstorms this afternoon.
.TONIGHT...Southwest winds 5 to 10 knots. Seas 5 to 7 feet,
occasionally to 8 feet. Wave Detail: Northeast 6 feet at 12
seconds and southeast 3 feet at 6 seconds. A chance of showers. A
chance of thunderstorms, mainly in the evening.
.FRIDAY...West winds 5 to 10 knots, becoming south in the
afternoon. Seas 5 to 7 feet, occasionally to 8 feet. Wave Detail:
Northeast 6 feet at 12 seconds and southeast 3 feet at 6 seconds.
A chance of showers with a slight chance of thunderstorms in the
morning, then showers and thunderstorms likely in the afternoon.
.FRIDAY NIGHT...South winds 5 to 10 knots, becoming southwest
after midnight. Seas 5 to 7 feet, occasionally to 8 feet. Wave
Detail: Northeast 6 feet at 13 seconds and southeast 3 feet at 6
seconds. Showers. Thunderstorms likely, mainly in the evening.
.SATURDAY...West winds 5 to 10 knots, becoming south in the
afternoon. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail:
Northeast 5 feet at 14 seconds and southeast 3 feet at 6 seconds.
Showers with a chance of thunderstorms.
.SATURDAY NIGHT...Southwest winds 5 to 10 knots, becoming west
after midnight. Seas 4 to 5 feet, occasionally to 6 feet. Wave
Detail: Northeast 5 feet at 13 seconds and southeast 3 feet at
6 seconds. Showers with a chance of thunderstorms.
.SUNDAY...West winds 5 to 10 knots. Seas 3 to 5 feet,
occasionally to 6 feet. A chance of thunderstorms. Showers.
.MONDAY...West winds 5 to 10 knots. Seas 3 to 4 feet,
occasionally to 5 feet. A chance of showers. A chance of
thunderstorms .

Winds and seas higher in and near thunderstorms.

$$