FZUS52 KJAX 181729
CWFJAX
Coastal Waters Forecast for Northeast Florida/Southeast Georgia
National Weather Service Jacksonville FL
1229 PM EST Thu Dec 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.
AMZ400-190800-
Synopsis for Altamaha Sound GA to Flagler Beach FL out to 60 nm-
1229 PM EST Thu Dec 18 2025
.SYNOPSIS...
A trough will lift northward as a warm front today with increasing
showers over the waters with afternoon isolated thunderstorms as a
cold front approaches the region from the northwest. Winds from the
southeast this morning will become southerly and increase exercise
caution conditions offshore by this afternoon. Winds and seas will
increase further over the Northeast Florida offshore waters to small
Craft Advisory levels by mid afternoon with these conditions then
spreading into the offshore Southeast GA waters by early evening.
Winds will shift to westerly by Friday morning as a cold front moves
through the waters, turning northwesterly and then northerly Friday
afternoon into Friday evening.
High pressure will settle over the local waters during the weekend,
allowing for winds and seas to diminish. A weakening cold frontal
boundary will approach our region from the north on Monday as strong
high pressure builds to the north and wedges down the southeastern
seaboard as another coastal trough develops over our local waters.
This feature may develop showers over our local waters early next
week. Small Craft Advisory conditions will likely develop after
midnight on Sunday night as northeasterly winds surge, with elevated
seas likely persisting through Tuesday as onshore winds only
gradually subside.
.GULF STREAM...
The approximate location of the west wall of the Gulf Stream as of
Dec 18, 2025 at 0000 UTC...
50 nautical miles east of Flagler Beach.
53 nautical miles east of Saint Augustine Beach.
64 nautical miles east southeast of Jacksonville Beach.
71 nautical miles east southeast of St Simons Island.
This data derived from NCEP Global RTOFS model.
$$
AMZ450-452-454-190800-
Coastal waters from Altamaha Sound to Fernandina Beach FL out
20 NM-
Coastal waters from Fernandina Beach to St. Augustine FL out
20 NM-
Coastal waters from St. Augustine to Flagler Beach FL out 20 NM-
1229 PM EST Thu Dec 18 2025
.REST OF TODAY...Southeast winds 10 to 15 knots. Seas 3 to
5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at
8 seconds. Intracoastal waters a moderate chop. A chance of
showers. A slight chance of thunderstorms this afternoon.
.TONIGHT...Southwest winds 15 to 20 knots. Seas 4 to 6 feet,
occasionally to 8 feet. Wave Detail: Southeast 5 feet at
8 seconds and southwest 2 feet at 4 seconds. Intracoastal waters
choppy. A chance of showers with a slight chance of thunderstorms
in the evening, then a slight chance of showers after midnight.
.FRIDAY...West winds 10 to 15 knots. Seas 3 to 5 feet,
occasionally to 6 feet. Wave Detail: Southeast 5 feet at
8 seconds and southeast 4 feet at 7 seconds. Intracoastal waters
a moderate chop.
.FRIDAY NIGHT...North winds 10 to 15 knots. Seas 3 to 5 feet,
occasionally to 6 feet. Wave Detail: East 4 feet at 9 seconds and
north 3 feet at 4 seconds. Intracoastal waters a moderate chop.
.SATURDAY...Northeast winds 5 to 10 knots. Seas 3 to 4 feet,
occasionally to 5 feet. Wave Detail: East 3 feet at 9 seconds and
north 2 feet at 5 seconds. Intracoastal waters light chop.
.SATURDAY NIGHT...Northeast winds around 5 knots, becoming
northwest after midnight. Seas around 3 feet. Wave Detail: East
3 feet at 9 seconds. Intracoastal waters smooth.
.SUNDAY...North winds 5 to 10 knots, becoming northeast 25 to
30 knots. Seas 3 to 4 feet, occasionally to 5 feet, building to
5 to 7 feet, occasionally to 9 feet after midnight. Intracoastal
waters very rough.
.MONDAY...Northeast winds 25 to 30 knots, becoming east 20 to
25 knots. Seas 6 to 9 feet, occasionally to 11 feet. Intracoastal
waters very rough.
Winds and waves higher in and near thunderstorms.
$$
AMZ472-474-190800-
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-
1229 PM EST Thu Dec 18 2025
...SMALL CRAFT EXERCISE CAUTION IN EFFECT UNTIL 4 PM EST THIS
AFTERNOON...
...SMALL CRAFT ADVISORY IN EFFECT FROM 4 PM EST THIS AFTERNOON
THROUGH FRIDAY AFTERNOON...
.REST OF TODAY...Southeast winds 15 to 20 knots. Seas 5 to
7 feet, occasionally to 9 feet. Wave Detail: East 7 feet at
8 seconds. A chance of showers. A chance of thunderstorms this
afternoon.
.TONIGHT...Southwest winds 20 to 25 knots. Seas 6 to 8 feet,
occasionally to 10 feet. Wave Detail: Southeast 7 feet at
8 seconds and southwest 3 feet at 5 seconds. A slight chance of
thunderstorms. A chance of showers, mainly in the evening.
.FRIDAY...West winds 15 to 20 knots, becoming northwest in the
afternoon. Seas 5 to 7 feet, occasionally to 9 feet. Wave Detail:
Southeast 6 feet at 9 seconds and southwest 3 feet at 6 seconds.
.FRIDAY NIGHT...North winds 10 to 15 knots. Seas 5 to 6 feet,
occasionally to 8 feet. Wave Detail: Northwest 4 feet at
5 seconds and east 4 feet at 9 seconds.
.SATURDAY...Northeast winds 5 to 10 knots. Seas 4 to 5 feet,
occasionally to 6 feet. Wave Detail: East 4 feet at 9 seconds and
north 3 feet at 5 seconds.
.SATURDAY NIGHT...Southeast winds around 5 knots, becoming west
after midnight. Seas 3 to 4 feet, occasionally to 5 feet. Wave
Detail: East 4 feet at 9 seconds.
.SUNDAY...Northwest winds 5 to 10 knots, becoming northeast 20 to
25 knots. Seas 3 to 5 feet, occasionally to 6 feet, building to
5 to 8 feet, occasionally to 10 feet after midnight.
.MONDAY...Northeast winds 25 to 30 knots, becoming east 20 to
25 knots. Seas 7 to 10 feet, occasionally to 13 feet. A slight
chance of showers.
Winds and seas higher in and near thunderstorms.
$$
AMZ470-190800-
Waters from Altamaha Sound GA to Fernandina Beach FL from 20 to
60 NM-
1229 PM EST Thu Dec 18 2025
...SMALL CRAFT EXERCISE CAUTION IN EFFECT UNTIL 4 PM EST THIS
AFTERNOON...
...SMALL CRAFT ADVISORY IN EFFECT FROM 7 PM EST THIS EVENING
THROUGH FRIDAY AFTERNOON...
.REST OF TODAY...Southeast winds 10 to 15 knots, increasing to
15 to 20 knots this afternoon. Seas 4 to 6 feet, occasionally to
8 feet. Wave Detail: Southeast 6 feet at 8 seconds. A chance of
showers late this morning, then showers likely with a chance of
thunderstorms this afternoon.
.TONIGHT...Southwest winds 20 to 25 knots. Seas 5 to 8 feet,
occasionally to 10 feet. Wave Detail: South 8 feet at 8 seconds
and southeast 4 feet at 8 seconds. A slight chance of
thunderstorms. Showers likely, mainly in the evening.
.FRIDAY...West winds 15 to 20 knots. Seas 5 to 8 feet,
occasionally to 10 feet, subsiding to 5 to 6 feet, occasionally
to 8 feet in the afternoon. Wave Detail: Southeast 7 feet at
8 seconds and east 5 feet at 9 seconds, becoming southeast 5 feet
at 9 seconds and west 3 feet at 4 seconds.
.FRIDAY NIGHT...North winds 10 to 15 knots. Seas 4 to 6 feet,
occasionally to 8 feet. Wave Detail: Southeast 5 feet at
9 seconds and northwest 3 feet at 4 seconds.
.SATURDAY...Northeast winds 5 to 10 knots, diminishing to around
5 knots in the afternoon. Seas 3 to 5 feet, occasionally to
6 feet. Wave Detail: Southeast 4 feet at 9 seconds and north
2 feet at 4 seconds.
.SATURDAY NIGHT...West winds around 5 knots, increasing to 5 to
10 knots after midnight. Seas 3 to 4 feet, occasionally to
5 feet. Wave Detail: East 4 feet at 9 seconds.
.SUNDAY...Northwest winds 5 to 10 knots, becoming northeast 20 to
25 knots. Seas 3 to 5 feet, occasionally to 6 feet, building to
5 to 7 feet, occasionally to 9 feet after midnight.
.MONDAY...Northeast winds 20 to 25 knots, becoming east 15 to
20 knots. Seas 6 to 9 feet, occasionally to 11 feet. A slight
chance of showers in the evening.
Winds and seas higher in and near thunderstorms.
$$
CWFJAX
Coastal Waters Forecast for Northeast Florida/Southeast Georgia
National Weather Service Jacksonville FL
1229 PM EST Thu Dec 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.
AMZ400-190800-
Synopsis for Altamaha Sound GA to Flagler Beach FL out to 60 nm-
1229 PM EST Thu Dec 18 2025
.SYNOPSIS...
A trough will lift northward as a warm front today with increasing
showers over the waters with afternoon isolated thunderstorms as a
cold front approaches the region from the northwest. Winds from the
southeast this morning will become southerly and increase exercise
caution conditions offshore by this afternoon. Winds and seas will
increase further over the Northeast Florida offshore waters to small
Craft Advisory levels by mid afternoon with these conditions then
spreading into the offshore Southeast GA waters by early evening.
Winds will shift to westerly by Friday morning as a cold front moves
through the waters, turning northwesterly and then northerly Friday
afternoon into Friday evening.
High pressure will settle over the local waters during the weekend,
allowing for winds and seas to diminish. A weakening cold frontal
boundary will approach our region from the north on Monday as strong
high pressure builds to the north and wedges down the southeastern
seaboard as another coastal trough develops over our local waters.
This feature may develop showers over our local waters early next
week. Small Craft Advisory conditions will likely develop after
midnight on Sunday night as northeasterly winds surge, with elevated
seas likely persisting through Tuesday as onshore winds only
gradually subside.
.GULF STREAM...
The approximate location of the west wall of the Gulf Stream as of
Dec 18, 2025 at 0000 UTC...
50 nautical miles east of Flagler Beach.
53 nautical miles east of Saint Augustine Beach.
64 nautical miles east southeast of Jacksonville Beach.
71 nautical miles east southeast of St Simons Island.
This data derived from NCEP Global RTOFS model.
$$
AMZ450-452-454-190800-
Coastal waters from Altamaha Sound to Fernandina Beach FL out
20 NM-
Coastal waters from Fernandina Beach to St. Augustine FL out
20 NM-
Coastal waters from St. Augustine to Flagler Beach FL out 20 NM-
1229 PM EST Thu Dec 18 2025
.REST OF TODAY...Southeast winds 10 to 15 knots. Seas 3 to
5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at
8 seconds. Intracoastal waters a moderate chop. A chance of
showers. A slight chance of thunderstorms this afternoon.
.TONIGHT...Southwest winds 15 to 20 knots. Seas 4 to 6 feet,
occasionally to 8 feet. Wave Detail: Southeast 5 feet at
8 seconds and southwest 2 feet at 4 seconds. Intracoastal waters
choppy. A chance of showers with a slight chance of thunderstorms
in the evening, then a slight chance of showers after midnight.
.FRIDAY...West winds 10 to 15 knots. Seas 3 to 5 feet,
occasionally to 6 feet. Wave Detail: Southeast 5 feet at
8 seconds and southeast 4 feet at 7 seconds. Intracoastal waters
a moderate chop.
.FRIDAY NIGHT...North winds 10 to 15 knots. Seas 3 to 5 feet,
occasionally to 6 feet. Wave Detail: East 4 feet at 9 seconds and
north 3 feet at 4 seconds. Intracoastal waters a moderate chop.
.SATURDAY...Northeast winds 5 to 10 knots. Seas 3 to 4 feet,
occasionally to 5 feet. Wave Detail: East 3 feet at 9 seconds and
north 2 feet at 5 seconds. Intracoastal waters light chop.
.SATURDAY NIGHT...Northeast winds around 5 knots, becoming
northwest after midnight. Seas around 3 feet. Wave Detail: East
3 feet at 9 seconds. Intracoastal waters smooth.
.SUNDAY...North winds 5 to 10 knots, becoming northeast 25 to
30 knots. Seas 3 to 4 feet, occasionally to 5 feet, building to
5 to 7 feet, occasionally to 9 feet after midnight. Intracoastal
waters very rough.
.MONDAY...Northeast winds 25 to 30 knots, becoming east 20 to
25 knots. Seas 6 to 9 feet, occasionally to 11 feet. Intracoastal
waters very rough.
Winds and waves higher in and near thunderstorms.
$$
AMZ472-474-190800-
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-
1229 PM EST Thu Dec 18 2025
...SMALL CRAFT EXERCISE CAUTION IN EFFECT UNTIL 4 PM EST THIS
AFTERNOON...
...SMALL CRAFT ADVISORY IN EFFECT FROM 4 PM EST THIS AFTERNOON
THROUGH FRIDAY AFTERNOON...
.REST OF TODAY...Southeast winds 15 to 20 knots. Seas 5 to
7 feet, occasionally to 9 feet. Wave Detail: East 7 feet at
8 seconds. A chance of showers. A chance of thunderstorms this
afternoon.
.TONIGHT...Southwest winds 20 to 25 knots. Seas 6 to 8 feet,
occasionally to 10 feet. Wave Detail: Southeast 7 feet at
8 seconds and southwest 3 feet at 5 seconds. A slight chance of
thunderstorms. A chance of showers, mainly in the evening.
.FRIDAY...West winds 15 to 20 knots, becoming northwest in the
afternoon. Seas 5 to 7 feet, occasionally to 9 feet. Wave Detail:
Southeast 6 feet at 9 seconds and southwest 3 feet at 6 seconds.
.FRIDAY NIGHT...North winds 10 to 15 knots. Seas 5 to 6 feet,
occasionally to 8 feet. Wave Detail: Northwest 4 feet at
5 seconds and east 4 feet at 9 seconds.
.SATURDAY...Northeast winds 5 to 10 knots. Seas 4 to 5 feet,
occasionally to 6 feet. Wave Detail: East 4 feet at 9 seconds and
north 3 feet at 5 seconds.
.SATURDAY NIGHT...Southeast winds around 5 knots, becoming west
after midnight. Seas 3 to 4 feet, occasionally to 5 feet. Wave
Detail: East 4 feet at 9 seconds.
.SUNDAY...Northwest winds 5 to 10 knots, becoming northeast 20 to
25 knots. Seas 3 to 5 feet, occasionally to 6 feet, building to
5 to 8 feet, occasionally to 10 feet after midnight.
.MONDAY...Northeast winds 25 to 30 knots, becoming east 20 to
25 knots. Seas 7 to 10 feet, occasionally to 13 feet. A slight
chance of showers.
Winds and seas higher in and near thunderstorms.
$$
AMZ470-190800-
Waters from Altamaha Sound GA to Fernandina Beach FL from 20 to
60 NM-
1229 PM EST Thu Dec 18 2025
...SMALL CRAFT EXERCISE CAUTION IN EFFECT UNTIL 4 PM EST THIS
AFTERNOON...
...SMALL CRAFT ADVISORY IN EFFECT FROM 7 PM EST THIS EVENING
THROUGH FRIDAY AFTERNOON...
.REST OF TODAY...Southeast winds 10 to 15 knots, increasing to
15 to 20 knots this afternoon. Seas 4 to 6 feet, occasionally to
8 feet. Wave Detail: Southeast 6 feet at 8 seconds. A chance of
showers late this morning, then showers likely with a chance of
thunderstorms this afternoon.
.TONIGHT...Southwest winds 20 to 25 knots. Seas 5 to 8 feet,
occasionally to 10 feet. Wave Detail: South 8 feet at 8 seconds
and southeast 4 feet at 8 seconds. A slight chance of
thunderstorms. Showers likely, mainly in the evening.
.FRIDAY...West winds 15 to 20 knots. Seas 5 to 8 feet,
occasionally to 10 feet, subsiding to 5 to 6 feet, occasionally
to 8 feet in the afternoon. Wave Detail: Southeast 7 feet at
8 seconds and east 5 feet at 9 seconds, becoming southeast 5 feet
at 9 seconds and west 3 feet at 4 seconds.
.FRIDAY NIGHT...North winds 10 to 15 knots. Seas 4 to 6 feet,
occasionally to 8 feet. Wave Detail: Southeast 5 feet at
9 seconds and northwest 3 feet at 4 seconds.
.SATURDAY...Northeast winds 5 to 10 knots, diminishing to around
5 knots in the afternoon. Seas 3 to 5 feet, occasionally to
6 feet. Wave Detail: Southeast 4 feet at 9 seconds and north
2 feet at 4 seconds.
.SATURDAY NIGHT...West winds around 5 knots, increasing to 5 to
10 knots after midnight. Seas 3 to 4 feet, occasionally to
5 feet. Wave Detail: East 4 feet at 9 seconds.
.SUNDAY...Northwest winds 5 to 10 knots, becoming northeast 20 to
25 knots. Seas 3 to 5 feet, occasionally to 6 feet, building to
5 to 7 feet, occasionally to 9 feet after midnight.
.MONDAY...Northeast winds 20 to 25 knots, becoming east 15 to
20 knots. Seas 6 to 9 feet, occasionally to 11 feet. A slight
chance of showers in the evening.
Winds and seas higher in and near thunderstorms.
$$