412
FZUS52 KJAX 310719
CWFJAX

Coastal Waters Forecast for Northeast Florida/Southeast Georgia
National Weather Service Jacksonville FL
319 AM EDT Sun Aug 31 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.

AMZ400-312230-
Synopsis for Altamaha Sound GA to Flagler Beach FL out to 60 nm-
319 AM EDT Sun Aug 31 2025

.SYNOPSIS...

Low pressure located over the Gulf Stream waters adjacent to the
GA coast will shift slowly southward across the offshore waters
adjacent to northeast FL in tandem with a frontal boundary.
Meanwhile, strengthening high pressure extending from the Great
Lakes eastward across New England will wedge down the southeastern
seaboard, sending a surge of northeasterly winds and building seas
across our local waters from north to south today. Small Craft
Advisory conditions will overspread the waters north of St.
Augustine on Sunday, with Caution conditions reaching the waters
south of St. Augustine by Sunday evening. Waves of showers and
embedded thunderstorms will impact our local waters through
midweek. Northeasterly winds will begin to gradually weaken
by late Tuesday and Wednesday, allowing for seas to gradually
subside. Coverage of showers and thunderstorms will then decrease
later this week as prevailing winds shift to westerly ahead of
a series of approaching cold fronts.

.GULF STREAM...

The approximate location of the west wall of the Gulf Stream as of
Aug 28, 2025 at 1200 UTC...

 36 nautical miles east of Flagler Beach.
 46 nautical miles east of Saint Augustine Beach.
 56 nautical miles east of Jacksonville Beach.
 71 nautical miles east southeast of St Simons Island.

This data courtesy of the Naval Oceanographic Office.

$$

AMZ450-470-312230-
Coastal waters from Altamaha Sound to Fernandina Beach FL out
20 NM-
Waters from Altamaha Sound GA to Fernandina Beach FL from 20 to
60 NM-
319 AM EDT Sun Aug 31 2025

...SMALL CRAFT EXERCISE CAUTION IN EFFECT UNTIL 11 AM EDT THIS
MORNING...
...SMALL CRAFT ADVISORY IN EFFECT FROM 11 AM EDT THIS MORNING
THROUGH MONDAY EVENING...

.TODAY...North northeast winds 15 to 20 knots, increasing to 20
to 25 knots this afternoon. Seas 3 to 5 feet, occasionally to 6
feet. Wave Detail: Northeast 5 feet at 6 seconds. Intracoastal
waters becoming rough. A chance of showers and thunderstorms this
morning, then showers and thunderstorms likely this afternoon.
.TONIGHT...Northeast winds 20 to 25 knots. Seas 5 to 6 feet,
occasionally to 8 feet. Wave Detail: Northeast 6 feet at 7
seconds. Intracoastal waters rough. Showers with a chance of
thunderstorms.
.MONDAY...Northeast winds 20 to 25 knots. Seas 5 to 7 feet,
occasionally to 9 feet. Wave Detail: Northeast 7 feet at
6 seconds. Intracoastal waters rough. Showers likely with a chance
of thunderstorms in the morning, then a chance of showers and
thunderstorms in the afternoon.
.MONDAY NIGHT...Northeast winds 15 to 20 knots. Seas 5 to 7 feet,
occasionally to 9 feet. Wave Detail: Northeast 6 feet at
7 seconds. Intracoastal waters choppy. A chance of showers and
thunderstorms.
.TUESDAY AND TUESDAY NIGHT...Northeast winds 15 to 20 knots. Seas
4 to 6 feet, occasionally to 8 feet. Wave Detail: Northeast 5
.WEDNESDAY...East northeast winds 10 to 15 knots, becoming east
feet at 7 seconds. Intracoastal waters choppy. A chance of showers
and thunderstorms.
.WEDNESDAY...East northeast winds 10 to 15 knots, becoming east
during the afternoon. Seas 3 to 5 feet, occasionally to 6 feet.
Wave Detail: Northeast 4 feet at 9 seconds. Intracoastal waters
a light chop. A chance of showers and thunderstorms .
.WEDNESDAY NIGHT AND THURSDAY...Southeast winds 5 to 10 knots,
becoming west. Seas 2 to 4 feet. Intracoastal waters mostly
smooth. A chance of showers with a slight chance of thunderstorms.

Winds and waves higher in and near thunderstorms.

$$

AMZ452-472-312230-
Coastal waters from Fernandina Beach to St. Augustine FL out
20 NM-
Waters from Fernandina Beach to St. Augustine FL from 20 to 60 NM-
319 AM EDT Sun Aug 31 2025

...SMALL CRAFT EXERCISE CAUTION IN EFFECT UNTIL 5 PM EDT THIS
AFTERNOON...
...SMALL CRAFT ADVISORY IN EFFECT FROM LATE THIS AFTERNOON
THROUGH MONDAY EVENING...

.TODAY...North northeast winds increasing to 15 to 20 knots. Seas
building to 3 to 5 feet, occasionally to 6 feet. Wave Detail:
North 4 feet at 5 seconds and east 2 feet at 8 seconds.
Intracoastal waters becoming choppy. A chance of showers and
thunderstorms this morning, then showers and thunderstorms likely
this afternoon.
.TONIGHT...Northeast winds around 20 knots. Seas 4 to 5 feet,
occasionally to 6 feet. Wave Detail: Northeast 5 feet at 7
seconds. Intracoastal waters rough. Showers with a chance of
thunderstorms.
.MONDAY...Northeast winds 20 to 25 knots. Seas 5 to 7 feet,
occasionally to 9 feet. Wave Detail: Northeast 6 feet at 7
seconds. Intracoastal waters rough. Showers likely with a chance
of thunderstorms.
.MONDAY NIGHT...Northeast winds 15 to 20 knots. Seas 5 to 6 feet,
occasionally to 8 feet. Wave Detail: Northeast 6 feet at 7 seconds
and northeast 2 feet at 4 seconds. Intracoastal waters choppy. A
chance of showers and thunderstorms in the evening, then showers
likely with a chance of thunderstorms after midnight.
.TUESDAY...Northeast winds 15 to 20 knots. Seas around 5 feet,
occasionally to 6 feet. Wave Detail: Northeast 5 feet at 8 seconds
and northeast 3 feet at 5 seconds. Intracoastal waters choppy. A
chance of showers and thunderstorms in the morning, then showers
likely with a chance of thunderstorms in the afternoon.
.TUESDAY NIGHT...Northeast winds around 15 knots. Seas 4 to 5
feet, occasionally to 6 feet. Wave Detail: Northeast 5 feet at 7
seconds. Intracoastal waters a moderate chop. A chance of showers
and thunderstorms.
.WEDNESDAY...East northeast winds 10 to 15 knots. Seas 3 to 4
feet, occasionally to 5 feet. Intracoastal waters light chop. A
chance of showers and thunderstorms.
.WEDNESDAY NIGHT AND THURSDAY...Southeast winds around 10 knots,
becoming west after midnight. Seas 2 to 3 feet. Intracoastal
waters a light chop. A chance of showers with a slight chance of
thunderstorms.

Winds and waves higher in and near thunderstorms.

$$

AMZ454-474-312230-
Coastal waters from St. Augustine to Flagler Beach FL out 20 NM-
Waters from St. Augustine to Flagler Beach FL from 20 to 60 NM-
319 AM EDT Sun Aug 31 2025

...SMALL CRAFT EXERCISE CAUTION IN EFFECT FROM THIS AFTERNOON
THROUGH LATE MONDAY NIGHT...

.TODAY...North winds 10 to 15 knots, becoming northeast and
increasing to 15 to 20 knots this afternoon. Seas 2 to 4 feet,
occasionally to 5 feet. Wave Detail: North 3 feet at 5 seconds and
east 2 feet at 8 seconds. Intracoastal waters becoming choppy. A
chance of showers and thunderstorms this morning, then showers
and thunderstorms likely this afternoon.
.TONIGHT...Northeast winds 15 to 20 knots. Seas 3 to 5 feet,
occasionally to 6 feet. Wave Detail: Northeast 4 feet at
7 seconds. Intracoastal waters choppy. Showers with a chance of
thunderstorms.
.MONDAY...Northeast winds 15 to 20 knots. Seas 4 to 6 feet,
occasionally to 8 feet. Wave Detail: Northeast 6 feet at
7 seconds. Intracoastal waters choppy. Showers with a chance of
thunderstorms.
.MONDAY NIGHT...Northeast winds 15 to 20 knots, diminishing to
10 to 15 knots after midnight. Seas 5 to 6 feet, occasionally to
8 feet. Wave Detail: Northeast 6 feet at 8 seconds and northeast
2 feet at 5 seconds. Intracoastal waters choppy. Showers likely
with a chance of thunderstorms.
.TUESDAY AND TUESDAY NIGHT...East northeast winds around 15
knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail:
Northeast 5 feet at 8 seconds. Intracoastal waters a moderate
chop. Showers likely with a chance of thunderstorms.
.WEDNESDAY...Northeast winds 10 to 15 knots. Seas 3 to 5 feet,
occasionally to 6 feet. Wave Detail: Northeast 4 feet at 9
seconds. Intracoastal waters a light chop. Showers likely with a
chance of thunderstorms.
.WEDNESDAY NIGHT AND THURSDAY...Southeast winds 5 to 10 knots,
becoming west after midnight. Seas 2 to 4 feet, occasionally to 5
feet. Intracoastal waters light chop. A chance of showers with a
slight chance of thunderstorms.

Winds and waves higher in and near thunderstorms.

$$