710
FZUS52 KJAX 171350
CWFJAX

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

AMZ400-180500-
Synopsis for Altamaha Sound GA to Flagler Beach FL out to 60 nm-
950 AM EDT Sun Aug 17 2025

.SYNOPSIS...

A weak surface trough will linger across our local waters today,
with showers and thunderstorms expected to increase in coverage
and intensity this afternoon. Stronger storms will be capable of
creating briefly strong wind gusts, frequent lightning strikes,
and possible waterspouts. High pressure will then strengthen over
the Great Lakes region on Monday, with this feature wedging down
the southeastern seaboard through midweek, resulting in gradually
strengthening northeasterly winds across our local waters.
Meanwhile, Major Hurricane Erin will turn northwestward later
today and then northward by Tuesday, remaining east of northeast
of the Bahamas. Easterly swells from Erin will begin to increase
within our local waters on Monday, with Small Craft Advisory
conditions expected by Monday night offshore and on Tuesday near
shore. Small Craft conditions continue will through Thursday night
as Erin turns north-northeastward, remaining well offshore of the
U.S. eastern seaboard.


.GULF STREAM...

The approximate location of the west wall of the Gulf Stream as of
Aug 16, 2025 at 1200 UTC...

 57 nautical miles east of Flagler Beach.
 63 nautical miles east northeast of Saint Augustine Beach.
 68 nautical miles east of Jacksonville Beach.
 75 nautical miles east southeast of St Simons Island.

This data courtesy of the Naval Oceanographic Office.

$$

AMZ450-452-454-180500-
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-
950 AM EDT Sun Aug 17 2025

.REST OF TODAY...Northeast winds increasing to around 10 knots.
Seas around 2 feet. Intracoastal waters light chop. Showers
and thunderstorms likely. Stronger storms will produce frequent
lightning strikes, briefly gusty winds, and possible waterspouts.
.TONIGHT...East winds 5 to 10 knots. Seas around 2 feet. Wave
Detail: East 2 feet at 9 seconds. Intracoastal waters mostly
smooth. A chance of showers and thunderstorms.
.MONDAY...Northeast winds increasing to around 15 knots in the
afternoon. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail:
East 3 feet at 8 seconds and northeast 2 feet at 4 seconds.
Intracoastal waters becoming a moderate chop. A chance of showers
and thunderstorms. Stronger storms will produce frequent
lightning strikes and possible waterspouts.
.MONDAY NIGHT...East northeast winds around 10 knots. Seas 4 to 6
feet, occasionally to 8 feet. Wave Detail: East 5 feet at 15
seconds and northeast 3 feet at 7 seconds. Intracoastal waters a
light chop. A slight chance of showers and thunderstorms in the
evening.
.TUESDAY...Northeast winds around 15 knots. Seas 5 to 8 feet,
occasionally to 10 feet. Wave Detail: East 8 feet at 15 seconds
and northeast 2 feet at 6 seconds. Intracoastal waters a moderate
chop. A chance of showers and thunderstorms in the afternoon.
.TUESDAY NIGHT...Northeast winds 10 to 15 knots. Seas 7 to 10
feet, occasionally to 13 feet. Wave Detail: East 9 feet at 15
seconds and northeast 3 feet at 7 seconds. Intracoastal waters a
light chop. A chance of showers and thunderstorms.
.WEDNESDAY...North northeast winds around 15 knots. Seas 8 to 10
feet, occasionally to 13 feet. Intracoastal waters a moderate
chop. A chance of showers and thunderstorms.
.WEDNESDAY NIGHT...East winds around 10 knots, becoming south
southwest after midnight. Seas 6 to 7 feet, occasionally to 9
feet. Intracoastal waters a light chop. A slight chance of
showers and thunderstorms, mainly during the evening.
.THURSDAY...West winds around 10 knots, becoming southeast during
the afternoon. Seas 5 to 7 feet, occasionally to 9 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.

$$

AMZ470-472-474-180500-
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-
950 AM EDT Sun Aug 17 2025

.REST OF TODAY...Northeast winds increasing to around 10 knots.
Seas 2 to 3 feet. Wave Detail: East 2 feet at 9 seconds. Showers
and thunderstorms likely. Stronger storms will produce frequent
lightning strikes, briefly gusty winds and possible waterspouts.
.TONIGHT...East winds 5 to 10 knots. Seas 2 to 3 feet. Wave
Detail: East 2 feet at 9 seconds. A chance of showers. A chance
of thunderstorms, mainly in the evening.
.MONDAY...Northeast winds 5 to 10 knots, increasing to 10 to
15 knots in the afternoon. Seas 3 to 5 feet, occasionally to
6 feet. Wave Detail: East 4 feet at 15 seconds and northeast
3 feet at 7 seconds. A chance of showers and thunderstorms.
.MONDAY NIGHT...Northeast winds 10 to 15 knots. Seas 5 to 8 feet,
occasionally to 10 feet. Wave Detail: East 8 feet at 15 seconds
and east 3 feet at 7 seconds. A slight chance of thunderstorms in
the evening. A slight chance of showers.
.TUESDAY...Northeast winds 10 to 15 knots. Seas 8 to 11 feet,
occasionally to 14 feet. Wave Detail: Southeast 10 feet at
15 seconds and northeast 4 feet at 6 seconds. A chance of
showers. A slight chance of thunderstorms in the morning, then a
chance of thunderstorms in the afternoon.
.TUESDAY NIGHT...North winds 10 to 15 knots. Seas 9 to 13 feet,
occasionally to 17 feet. Wave Detail: Southeast 12 feet at
15 seconds and northeast 4 feet at 7 seconds. A chance of showers
and thunderstorms.
.WEDNESDAY...North winds 15 to 20 knots, becoming west 10 to
15 knots. Seas 9 to 13 feet, occasionally to 17 feet, subsiding
to 7 to 9 feet, occasionally to 11 feet. Showers likely in the
morning. A chance of thunderstorms through the day. A chance of
showers in the afternoon, then a slight chance of showers and
thunderstorms in the evening. A chance of showers and
thunderstorms after midnight.
.THURSDAY...Southwest winds 10 to 15 knots. Seas 6 to 9 feet,
occasionally to 11 feet. A chance of showers. A slight chance of
thunderstorms in the morning, then a chance of thunderstorms.

Winds and seas higher in and near thunderstorms.

$$