460
FZUS52 KJAX 181120
CWFJAX

Coastal Waters Forecast for Northeast Florida/Southeast Georgia
National Weather Service Jacksonville FL
720 AM EDT Tue Aug 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.

AMZ400-190230-
Synopsis for Altamaha Sound GA to Flagler Beach FL out to 60 nm-
720 AM EDT Tue Aug 18 2026

.SYNOPSIS...

High pressure extending from the Bahamas westward across the Gulf
will gradually weaken this week as a frontal boundary sags southward
over the southeastern states. Westerly winds will prevail during the
next couple of days, with winds over the near shore waters shifting
to southerly and increasing during the afternoon and evening hours
as the Atlantic sea breeze shifts slowly inland. Coverage of
afternoon and evening showers and thunderstorms will increase later
this afternoon and evening, mainly across the northeast Florida
waters. Scattered to numerous afternoon and evening thunderstorms
will mostly be confined to the northeast Florida waters on Wednesday
and Thursday, followed by coverage gradually increasing across the
Georgia waters from Friday through the upcoming weekend as the
frontal boundary stalls near our area.


.GULF STREAM...

The approximate location of the west wall of the Gulf Stream as of
Aug 17, 2026 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.
 68 nautical miles east southeast of St Simons Island.

This data derived from NCEP Global RTOFS model.


$$

AMZ450-452-454-190230-
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-
720 AM EDT Tue Aug 18 2026

.REST OF TODAY...West winds 10 to 15 knots, becoming south this
afternoon. Seas 2 to 3 feet. Wave Detail: West 2 feet at
3 seconds and east 2 feet at 8 seconds. Intracoastal waters a
moderate chop. A slight chance of showers and thunderstorms this
afternoon.
.TONIGHT...West winds 10 to 15 knots. Seas 2 to 3 feet. Wave
Detail: Southwest 2 feet at 4 seconds and east 2 feet at
9 seconds. Intracoastal waters a moderate chop.
.WEDNESDAY...West winds 5 to 10 knots, becoming south in the
afternoon. Seas 2 to 3 feet. Wave Detail: West 2 feet at
3 seconds and east 2 feet at 10 seconds. Intracoastal waters
light chop. A slight chance of showers and thunderstorms in the
afternoon.
.WEDNESDAY NIGHT...Southwest winds 5 to 10 knots. Seas 2 to
3 feet. Wave Detail: South 2 feet at 3 seconds and east 2 feet at
9 seconds. Intracoastal waters light chop.
.THURSDAY...Southwest winds 5 to 10 knots, becoming southeast
10 to 15 knots in the afternoon. Seas 2 to 3 feet. Wave Detail:
Southeast 2 feet at 3 seconds and east 2 feet at 9 seconds.
Intracoastal waters a moderate chop. A chance of showers and
thunderstorms in the afternoon.
.THURSDAY NIGHT...South winds 10 to 15 knots, becoming southwest
5 to 10 knots after midnight. Seas 2 to 3 feet. Wave Detail:
South 2 feet at 4 seconds. Intracoastal waters a moderate chop. A
slight chance of showers and thunderstorms in the evening.
.FRIDAY THROUGH SATURDAY...Southwest winds 10 to 15 knots. Seas
2 to 3 feet. Intracoastal waters a moderate chop. A chance of
showers and thunderstorms.

Winds and waves higher in and near thunderstorms.

$$

AMZ470-472-474-190230-
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-
720 AM EDT Tue Aug 18 2026

.REST OF TODAY...West winds 10 to 15 knots, becoming southwest
this afternoon. Seas 2 to 4 feet, occasionally to 5 feet. Wave
Detail: West 3 feet at 4 seconds and east 2 feet at 8 seconds.
.TONIGHT...West winds 10 to 15 knots. Seas around 3 feet. Wave
Detail: Southwest 3 feet at 4 seconds and east 2 feet at
10 seconds.
.WEDNESDAY...West winds 5 to 10 knots, becoming south in the
afternoon. Seas 2 to 3 feet. Wave Detail: West 2 feet at
4 seconds and east 2 feet at 10 seconds.
.WEDNESDAY NIGHT...Southwest winds 5 to 10 knots. Seas 2 to
3 feet. Wave Detail: Southwest 2 feet at 3 seconds and east
2 feet at 9 seconds.
.THURSDAY AND THURSDAY NIGHT...Southwest winds 10 to 15 knots.
Seas 2 to 3 feet. Wave Detail: Southwest 2 feet at 3 seconds and
east 2 feet at 9 seconds.
.FRIDAY THROUGH SATURDAY...Southwest winds 10 to 15 knots. Seas
2 to 3 feet. Wave Detail: South 3 feet at 4 seconds and east
2 feet at 8 seconds. A chance of showers and thunderstorms.

Winds and seas higher in and near thunderstorms.

$$