151
FZUS52 KJAX 181825
CWFJAX

Coastal Waters Forecast for Northeast Florida/Southeast Georgia
National Weather Service Jacksonville FL
225 PM EDT Fri Sep 18 2026

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.

AMZ400-190900-
Synopsis for Altamaha Sound GA to Flagler Beach FL out to 60 nm-
225 PM EDT Fri Sep 18 2026

.SYNOPSIS...

A weak trough positioned over the east coast of Florida will
continue the potential for scattered showers and possibly an
embedded thunderstorm through late this afternoon, mostly for the
waters from St. Augustine southward. Winds and seas should remain
below Caution levels during the next several days throughout our
local waters. Showers and thunderstorms are expected to increase
beginning late Saturday night, with activity likely continuing
through at least early next week. A stronger high pressure center
may build southward later next week, potentially resulting in
another round of northeasterly winds across our local waters.


.GULF STREAM...

The approximate location of the west wall of the Gulf Stream as of
Sep 18, 2026 at 0000 UTC...

 50 nautical miles east of Flagler Beach.
 58 nautical miles east of Saint Augustine Beach.
 70 nautical miles east southeast of Jacksonville Beach.
 71 nautical miles east southeast of St Simons Island.

This data derived from NCEP Global RTOFS model.


$$

AMZ450-452-454-190900-
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-
225 PM EDT Fri Sep 18 2026

.REST OF TODAY...Northeast winds 10 to 15 knots. Seas 3 to
4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at
7 seconds. Intracoastal waters a moderate chop. A slight chance
of showers and thunderstorms.
.TONIGHT...East winds 5 to 10 knots, becoming northeast after
midnight. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail:
East 3 feet at 7 seconds. Intracoastal waters light chop.
.SATURDAY...Northeast winds 5 to 10 knots. Seas 2 to 3 feet. Wave
Detail: East 3 feet at 7 seconds. Intracoastal waters light chop.
.SATURDAY NIGHT...East winds 5 to 10 knots. Seas around 2 feet.
Wave Detail: East 2 feet at 7 seconds. Intracoastal waters light
chop. A chance of showers with a slight chance of thunderstorms
after midnight.
.SUNDAY AND SUNDAY NIGHT...East winds 5 to 10 knots. Seas around
2 feet. Wave Detail: East 2 feet at 7 seconds and east 2 feet at
11 seconds. Intracoastal waters light chop. A chance of showers
with a slight chance of thunderstorms.
.MONDAY THROUGH TUESDAY...East winds 5 to 10 knots. Seas around
2 feet. Wave Detail: East 2 feet at 8 seconds. Intracoastal
waters light chop. Showers likely with a chance of thunderstorms.

Winds and waves higher in and near thunderstorms.

$$

AMZ470-472-474-190900-
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-
225 PM EDT Fri Sep 18 2026

.REST OF TODAY...Northeast winds 10 to 15 knots. Seas 3 to
4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at
7 seconds. A slight chance of showers and thunderstorms.
.TONIGHT...East winds 5 to 10 knots. Seas 3 to 4 feet,
occasionally to 5 feet. Wave Detail: East 4 feet at 7 seconds.
.SATURDAY...Northeast winds 5 to 10 knots. Seas 2 to 3 feet. Wave
Detail: East 3 feet at 7 seconds. A slight chance of showers and
thunderstorms.
.SATURDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 3 feet.
Wave Detail: East 2 feet at 8 seconds. A slight chance of
thunderstorms. A slight chance of showers in the evening, then a
chance of showers after midnight.
.SUNDAY...Northeast winds 5 to 10 knots. Seas around 2 feet. Wave
Detail: Northeast 2 feet at 7 seconds and east 2 feet at
11 seconds. A chance of showers with a slight chance of
thunderstorms.
.SUNDAY NIGHT...East winds 5 to 10 knots. Seas around 2 feet.
Wave Detail: East 2 feet at 8 seconds and east 2 feet at
11 seconds. A chance of thunderstorms. A chance of showers in the
evening, then showers likely after midnight.
.MONDAY THROUGH TUESDAY...Southeast winds 5 to 10 knots. Seas
2 to 3 feet. Showers likely with a chance of thunderstorms.

Winds and seas higher in and near thunderstorms.

$$