709
FZUS52 KJAX 180653
CWFJAX

Coastal Waters Forecast for Northeast Florida/Southeast Georgia
National Weather Service Jacksonville FL
253 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.

AMZ400-182200-
Synopsis for Altamaha Sound GA to Flagler Beach FL out to 60 nm-
253 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 several 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 late 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.

$$

AMZ450-452-454-182200-
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-
253 AM EDT Tue Aug 18 2026

.TODAY...West winds around 10 knots, becoming south southeast
late 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
light chop. A chance of showers and thunderstorms late this
afternoon.
.TONIGHT...Southwest winds around 15 knots, becoming west 10 to 15
knots after midnight. Seas 2 to 3 feet. Wave Detail: South 2 feet
at 4 seconds and east 2 feet at 9 seconds. Intracoastal waters a
moderate chop. A slight chance of showers and thunderstorms in the
evening.
.WEDNESDAY...West winds 5 to 10 knots, becoming south southeast 10
to 15 knots in the afternoon. Seas 2 to 3 feet. Wave Detail:
Southwest 2 feet at 3 seconds and east 2 feet at 10 seconds.
Intracoastal waters a light chop. A chance of showers and
thunderstorms late in the afternoon.
.WEDNESDAY NIGHT...Southwest winds 10 to 15 knots, diminishing to
5 to 10 knots after midnight. Seas 2 to 3 feet. Wave Detail:
South 2 feet at 3 seconds and east 2 feet at 9 seconds.
Intracoastal waters becoming mostly smooth. A slight chance of
showers and thunderstorms in the evening.
.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 becoming a light chop. A chance of showers
and thunderstorms in the afternoon.
.THURSDAY NIGHT...South winds 10 to 15 knots, becoming southwest
around 10 knots after midnight. Seas 2 to 3 feet. Wave Detail:
South 2 feet at 4 seconds. Intracoastal waters a light chop. A
slight chance of showers and thunderstorms in the evening.
.FRIDAY...Southwest winds 5 to 10 knots, becoming south southeast
around 15 knots in the afternoon. Seas 2 to 3 feet. Intracoastal
waters becoming a moderate chop. A chance of showers and
thunderstorms during the afternoon.
.FRIDAY NIGHT...South winds around 15 knots, becoming southwest 10
to 15 knots after midnight. Seas 2 to 3 feet. Intracoastal waters
becoming a light chop. A chance of showers and thunderstorms
during the evening.
.SATURDAY...Southwest winds around 10 knots, becoming south around
15 knots during the afternoon. Seas 2 to 3 feet. Intracoastal
waters becoming a moderate chop. Showers and thunderstorms likely
during the afternoon.

Winds and waves higher in and near thunderstorms.

$$

AMZ470-472-474-182200-
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-
253 AM EDT Tue Aug 18 2026

.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 3 to 4 feet,
occasionally to 5 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 4 feet, occasionally to 5 feet. Wave Detail:
West 3 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.

$$