965
FZUS52 KJAX 170917
CWFJAX

Coastal Waters Forecast for Northeast Florida/Southeast Georgia
National Weather Service Jacksonville FL
517 AM EDT Mon Aug 17 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.

AMZ400-180030-
Synopsis for Altamaha Sound GA to Flagler Beach FL out to 60 nm-
517 AM EDT Mon Aug 17 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. Chances for mainly afternoon and
evening thunderstorms will increase across our local waters mid to
late week. Scattered late afternoon and evening showers and
thunderstorms will be possible today, mainly over the near shore
waters. Westerly winds will prevail during the next several days,
with winds over the near shore waters shifting to southerly during
the afternoon hours as the Atlantic sea breeze shifts slowly inland.
Coverage of afternoon and evening showers and thunderstorms will
increase on Tuesday ahead of the approaching frontal boundary, with
southwesterly winds surging ahead of this boundary on Tuesday
evening possibly bringing speeds up to near Caution levels. Coverage
of afternoon and evening showers and thunderstorms will shift to the
northeast Florida waters on Wednesday and Thursday, followed by
increasing coverage from Friday through the upcoming weekend
throughout our local waters.


.GULF STREAM...

The approximate location of the west wall of the Gulf Stream as of
Aug 16, 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.

$$

AMZ450-452-454-180030-
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-
517 AM EDT Mon Aug 17 2026

.TODAY...West winds 5 to 10 knots, becoming south southeast around
10 knots this afternoon. Seas around 2 feet. Wave Detail:
Southeast 2 feet at 8 seconds. Intracoastal waters becoming a
light chop. A chance of showers and thunderstorms late this
afternoon.
.TONIGHT...Southwest winds 10 to 15 knots, becoming west after
midnight. Seas 2 to 3 feet. Wave Detail: South 2 feet at 3
seconds and southeast 2 feet at 8 seconds. Intracoastal waters a
light chop. A chance of showers and thunderstorms early this
evening.
.TUESDAY...West winds around 10 knots, becoming south 10 to 15
knots in the 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 in the
afternoon.
.TUESDAY NIGHT...Southwest winds around 15 knots, becoming west
southwest 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 chance of showers and
thunderstorms in the evening.
.WEDNESDAY...West southwest winds 5 to 10 knots, becoming
southeast around 10 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 in the afternoon.
.WEDNESDAY NIGHT...South winds 10 to 15 knots, becoming southwest
5 to 10 knots after midnight. Seas around 2 feet. Wave Detail:
South 2 feet at 3 seconds and east 2 feet at 9 seconds.
Intracoastal waters becoming mostly smooth after midnight. A
slight chance of showers and thunderstorms in the evening.
.THURSDAY...Southwest winds 5 to 10 knots, becoming southeast 10
to 15 knots during the afternoon. Seas 2 to 3 feet. Intracoastal
waters a moderate chop. A chance of showers and thunderstorms
during the afternoon.
.THURSDAY NIGHT AND FRIDAY...South southwest winds 10 to 15
knots, becoming southeast during the afternoon. Seas 2 to 3 feet.
Intracoastal waters a light chop. A chance of showers and
thunderstorms, mainly during the afternoon and evening.

Winds and waves higher in and near thunderstorms.

$$

AMZ470-472-474-180030-
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-
517 AM EDT Mon Aug 17 2026

.TODAY...West winds around 10 knots, becoming southwest this
afternoon. Seas 2 to 3 feet. Wave Detail: West 2 feet at
3 seconds and southeast 2 feet at 8 seconds. A slight chance of
showers and thunderstorms late this afternoon.
.TONIGHT...West winds 10 to 15 knots. Seas 2 to 4 feet,
occasionally to 5 feet. Wave Detail: Southwest 3 feet at
4 seconds and southeast 2 feet at 8 seconds. A slight chance of
showers and thunderstorms early in the evening.
.TUESDAY...West winds 10 to 15 knots, becoming southwest in the
afternoon. Seas 2 to 3 feet. Wave Detail: West 3 feet at
4 seconds and southeast 2 feet at 8 seconds. A slight chance of
showers and thunderstorms late in the afternoon.
.TUESDAY NIGHT...Southwest winds around 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. A slight chance of showers
and thunderstorms in the evening.
.WEDNESDAY AND WEDNESDAY NIGHT...Southwest winds 5 to 10 knots.
Seas 2 to 3 feet. Wave Detail: Southwest 3 feet at 4 seconds and
east 2 feet at 10 seconds. A slight chance of
showers and thunderstorms, mainly during the afternoon and
evening.
.THURSDAY THROUGH FRIDAY...Southwest winds 10 to 15 knots. Seas
2 to 3 feet. Wave Detail: South 3 feet at 4 seconds and east
2 feet at 9 seconds. A slight chance of showers and
thunderstorms, mainly during the afternoon and evening.

Winds and seas higher in and near thunderstorms.

$$