092
FZUS52 KJAX 180534
CWFJAX

Coastal Waters Forecast for Northeast Florida/Southeast Georgia
National Weather Service Jacksonville FL
134 AM EDT Mon Aug 18 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.

AMZ400-191100-
Synopsis for Altamaha Sound GA to Flagler Beach FL out to 60 nm-
134 AM EDT Mon Aug 18 2025

.SYNOPSIS...

A surface trough across north Florida will shift south today as high
pressure strengthens north of the region, increasing northeast winds
over the local waters. Swells from Hurricane Erin increase today,
with combined seas reaching Small Craft Advisory thresholds tonight.
Small Craft conditions will continue through Thursday due to
elevated seas as Hurricane Erin tracks northward, east of the U.S.
Atlantic coast through the end of the week.

.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.


$$

AMZ450-452-454-191100-
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-
134 AM EDT Mon Aug 18 2025

...SMALL CRAFT ADVISORY IN EFFECT FROM LATE TONIGHT THROUGH
THURSDAY EVENING...

.TODAY...Northeast winds 5 to 10 knots, increasing to 10 to
15 knots this afternoon. Seas 2 to 4 feet, occasionally to
5 feet. Wave Detail: Northeast 3 feet at 7 seconds and east
2 feet at 16 seconds. Intracoastal waters a moderate chop. A
chance of showers with a slight chance of thunderstorms.
.TONIGHT...East winds 10 to 15 knots. Seas 4 to 6 feet,
occasionally to 8 feet. Wave Detail: East 5 feet at 13 seconds
and northeast 3 feet at 7 seconds. Intracoastal waters a moderate
chop. A slight chance of showers after midnight.
.TUESDAY...Northeast winds 15 to 20 knots. Seas 5 to 8 feet,
occasionally to 10 feet. Wave Detail: East 8 feet at 15 seconds
and northeast 5 feet at 6 seconds. Intracoastal waters choppy. A
chance of showers. A slight chance of thunderstorms in the
morning, then a chance of thunderstorms in the afternoon.
.TUESDAY NIGHT...Northeast winds 15 to 20 knots. Seas 7 to
10 feet, occasionally to 13 feet. Wave Detail: Southeast 9 feet
at 16 seconds and northeast 5 feet at 6 seconds. Intracoastal
waters choppy. A chance of showers. A chance of thunderstorms,
mainly in the evening.
.WEDNESDAY...North winds 15 to 20 knots. Seas 8 to 11 feet,
occasionally to 14 feet. Wave Detail: East 10 feet at 16 seconds
and northeast 5 feet at 6 seconds. Intracoastal waters choppy.
Showers likely with a slight chance of thunderstorms in the
morning, then a chance of showers and thunderstorms in the
afternoon.
.WEDNESDAY NIGHT...North winds 10 to 15 knots, becoming west
after midnight. Seas 8 to 11 feet, occasionally to 14 feet,
subsiding to 6 to 9 feet, occasionally to 11 feet after midnight.
Wave Detail: East 10 feet at 15 seconds and northeast 4 feet at
7 seconds, becoming east 8 feet at 15 seconds and northeast
3 feet at 8 seconds. Intracoastal waters a moderate chop. A
slight chance of showers and thunderstorms in the evening.
.THURSDAY...Northeast winds around 10 knots, becoming south. Seas
5 to 8 feet, occasionally to 10 feet. Intracoastal waters light
chop. A slight chance of showers and thunderstorms in the
morning, then a chance of showers and thunderstorms through the
night. A slight chance of showers and thunderstorms after
midnight.
.FRIDAY...Southeast winds 5 to 10 knots, becoming south. Seas
5 to 7 feet, occasionally to 9 feet. Intracoastal waters light
chop. A chance of showers and thunderstorms in the morning, then
thunderstorms likely in the afternoon. Showers likely through the
night. A chance of thunderstorms in the evening, then a chance of
showers with a slight chance of thunderstorms after midnight.

Winds and waves higher in and near thunderstorms.

$$

AMZ470-472-474-191100-
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-
134 AM EDT Mon Aug 18 2025

...SMALL CRAFT ADVISORY IN EFFECT FROM THIS EVENING THROUGH
THURSDAY EVENING...

.TODAY...Northeast winds 5 to 10 knots, increasing to 10 to
15 knots this afternoon. Seas 3 to 5 feet, occasionally to
6 feet. Wave Detail: Southeast 4 feet at 15 seconds and east
3 feet at 8 seconds. A chance of showers with a slight chance of
thunderstorms.
.TONIGHT...Northeast winds 10 to 15 knots. Seas 4 to 6 feet,
occasionally to 8 feet, building to 5 to 8 feet, occasionally to
10 feet after midnight. Wave Detail: East 5 feet at 14 seconds
and northeast 3 feet at 7 seconds, becoming east 8 feet at
15 seconds and east 3 feet at 7 seconds. A slight chance of
showers. A slight chance of thunderstorms after midnight.
.TUESDAY...Northeast winds 15 to 20 knots. Seas 8 to 11 feet,
occasionally to 14 feet. Wave Detail: East 10 feet at 15 seconds
and northeast 5 feet at 6 seconds. A chance of showers. A slight
chance of thunderstorms in the afternoon.
.TUESDAY NIGHT...Northeast winds 15 to 20 knots. Seas 9 to
13 feet, occasionally to 17 feet. Wave Detail: Southeast 12 feet
at 16 seconds and northeast 5 feet at 7 seconds. A chance of
thunderstorms. A chance of showers in the evening, then showers
likely after midnight.
.WEDNESDAY...North winds 15 to 20 knots. Seas 11 to 14 feet,
occasionally to 18 feet. Wave Detail: East 13 feet at 15 seconds
and northeast 6 feet at 7 seconds. A chance of thunderstorms.
Showers likely, mainly in the morning.
.WEDNESDAY NIGHT...Northwest winds 10 to 15 knots. Seas 9 to
13 feet, occasionally to 17 feet, subsiding to 8 to 10 feet,
occasionally to 13 feet after midnight. Wave Detail: East 11 feet
at 15 seconds and northeast 5 feet at 8 seconds, becoming east
9 feet at 14 seconds and northeast 4 feet at 9 seconds. A chance
of showers and thunderstorms.
.THURSDAY...North winds 10 to 15 knots, becoming south. Seas 7 to
10 feet, occasionally to 13 feet. A chance of showers and
thunderstorms.
.FRIDAY...Southeast winds 5 to 10 knots. Seas 5 to 8 feet,
occasionally to 10 feet. A chance of thunderstorms. A chance of
showers in the morning, then showers likely.

Winds and seas higher in and near thunderstorms.

$$