585
FZUS52 KKEY 110838 CCA
CWFKEY

Coastal Waters Forecast for the Florida Keys...CORRECTED
National Weather Service Key West FL
438 AM EDT Fri Sep 11 2026

Florida Bay, Hawk Channel and Straits of Florida from Ocean Reef
to south of Dry Tortugas, and the extreme southeastern Gulf of
America, including The Florida Keys National Marine Sanctuary

Seas are given as significant wave height, which is the average
height of the highest 1/3 of the waves. Individual waves may be
more than twice the significant wave height.

The Wave Detail section highlights the period and direction of
origin for the highest-energy waves, as well as any long-period
swells moving in a different direction than the wind.

GMZ005-112045-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
438 AM EDT Fri Sep 11 2026

.SYNOPSIS...
Ridging across the southeastern United States and Florida will
maintain mostly gentle east to southeasterly breezes over the next
few days. Expect breezes to peak in the evening and overnight
while lulling during the day. Low level moisture will remain
abundant and keep convective potential slightly above normal. The
ridge will be reinforced late in the forecast and may drive
freshening northeast to easterly breezes.

The Approximate Shoreward Edge of the Gulf Stream as of September
11, 2026...

26 NM south of Dry Tortugas Light, on Loggerhead Key
15 NM south of Cosgrove Shoal Light, off the Marquesas Keys
15 NM south of Sand Key Light, off Key West
11 NM south-southeast of Looe Key, off Big Pine Key
 8 NM southeast of Sombrero Key Light, off Marathon
 6 NM southeast of Alligator Reef Light, off Islamorada
 2 NM southeast of Molasses Reef Light, off Key Largo
 1 NM east-southeast of Carysfort Reef Light, off Ocean Reef

Gulf Stream Information Courtesy of the National Weather Service in
Key West, using data from RTOFS and NASA SPoRT SST.

$$

GMZ031-112045-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
438 AM EDT Fri Sep 11 2026

.TODAY...East to southeast winds near 10 knots. Bay waters a
light chop. A chance of showers and thunderstorms.
.TONIGHT...East to southeast winds near 10 knots. Bay waters a
light chop. A chance of showers and thunderstorms.
.SATURDAY...Southeast winds near 10 knots. Bay waters a light
chop. Showers likely with a chance of thunderstorms.
.SATURDAY NIGHT...Southeast winds near 10 knots. Bay waters
a light chop. A chance of showers and thunderstorms.
.SUNDAY...Southeast winds 5 to 10 knots. Bay waters smooth to a
light chop. Showers likely with a chance of thunderstorms.
.SUNDAY NIGHT...East winds 5 to 10 knots. Bay waters smooth to a
light chop. A chance of showers and thunderstorms.
.MONDAY...East winds 5 to 10 knots. Bay waters smooth to a light
chop. A chance of showers and thunderstorms.
.MONDAY NIGHT...Northeast to east winds near 10 knots. Bay waters
a light chop. A chance of showers and thunderstorms.
.TUESDAY...Northeast to east winds 10 to 15 knots, increasing to
15 to 20 knots. Bay waters a light to moderate chop, becoming to
choppy. Showers likely with a chance of thunderstorms.
.TUESDAY NIGHT...Northeast to east winds 15 to 20 knots,
decreasing to near 15 knots. Bay waters choppy, becoming a
moderate chop. Showers likely with a chance of thunderstorms.

$$

GMZ032-035-112045-
Bayside and Gulf side from Craig Key to west end of Seven Mile
Bridge-
Gulf of Mexico from west end of Seven Mile Bridge to Halfmoon
Shoal out to 5 Fathoms-
438 AM EDT Fri Sep 11 2026

.TODAY...East to southeast winds near 10 knots. Seas around 1
foot. Nearshore waters a light chop. A chance of showers and
thunderstorms.
.TONIGHT...East to southeast winds near 10 knots. Seas around 1
foot. Nearshore waters a light chop. A chance of showers and
thunderstorms.
.SATURDAY...Southeast winds near 10 knots, decreasing to 5 to 10
knots. Seas 1 foot or less. Nearshore waters a light chop,
becoming smooth to a light chop. A chance of showers and
thunderstorms.
.SATURDAY NIGHT...Southeast winds 5 to 10 knots. Seas 1 foot or
less. Nearshore waters smooth to a light chop. A chance of
showers and thunderstorms.
.SUNDAY...Southeast winds near 5 knots. Seas 1 foot or less.
Nearshore waters smooth. A chance of showers and thunderstorms.
.SUNDAY NIGHT...East winds 5 to 10 knots. Seas 1 foot or less.
Nearshore waters smooth to a light chop. A chance of showers and
thunderstorms.
.MONDAY...East winds 5 to 10 knots. Seas 1 foot or less.
Nearshore waters smooth to a light chop. A chance of showers and
thunderstorms.
.MONDAY NIGHT...East winds near 10 knots. Seas around 1 foot.
Nearshore waters a light chop. A chance of showers and
thunderstorms.
.TUESDAY...East winds 10 to 15 knots, increasing to 15 to 20
knots. Seas 1 to 2 feet. Nearshore waters a light to moderate
chop, becoming choppy. Showers likely with a chance of
thunderstorms.
.TUESDAY NIGHT...Northeast to east winds 15 to 20 knots,
decreasing to near 15 knots. Seas 1 to 2 feet, except 2 to 3 feet
west of the Marquesas Keys. Nearshore waters choppy, becoming a
moderate chop. Showers likely with a chance of thunderstorms.

$$

GMZ042>044-112045-
Hawk Channel from Ocean Reef to Craig Key out to the reef-
Hawk Channel from Craig Key to west end of Seven Mile Bridge out
to the reef-
Hawk Channel from west end of Seven Mile Bridge to Halfmoon Shoal
out to the reef-
438 AM EDT Fri Sep 11 2026

.TODAY...East to southeast winds near 10 knots. Seas 1 to 2 feet.
Nearshore waters a light chop. A chance of showers and
thunderstorms.
.TONIGHT...East to southeast winds 10 to 15 knots. Seas 1 to
2 feet. Nearshore waters a light to moderate chop. A chance of
showers and thunderstorms.
.SATURDAY...Southeast winds 5 to 10 knots. Seas 1 to 2 feet.
Nearshore waters smooth to a light chop. A chance of showers and
thunderstorms.
.SATURDAY NIGHT...Southeast winds 5 to 10 knots. Seas around
1 foot. Nearshore waters smooth to a light chop. A chance of
showers and thunderstorms.
.SUNDAY...Southeast winds 5 to 10 knots. Seas around 1 foot.
Nearshore waters smooth to a light chop. A chance of showers and
thunderstorms.
.SUNDAY NIGHT...East winds 5 to 10 knots. Seas around 1 foot.
Nearshore waters smooth to a light chop. A chance of showers and
thunderstorms.
.MONDAY...East winds 5 to 10 knots. Seas around 1 foot. Nearshore
waters smooth to a light chop. A chance of showers and
thunderstorms.
.MONDAY NIGHT...East winds 10 to 15 knots. Seas 1 to 2 feet.
Nearshore waters a light to moderate chop. A chance of showers
and thunderstorms.
.TUESDAY...Northeast to east winds 10 to 15 knots, increasing to
15 to 20 knots. Seas 1 to 2 feet. Nearshore waters a light to
moderate chop, becoming choppy. Showers likely with a chance of
thunderstorms.
.TUESDAY NIGHT...Northeast to east winds 15 to 20 knots,
decreasing to near 15 knots. Seas 2 to 3 feet. Nearshore waters
choppy, becoming a moderate chop. Showers likely with a chance of
thunderstorms.

$$

GMZ052>055-072>075-112045-
Straits of Florida from Ocean Reef to Craig Key out 20 NM-
Straits of Florida from Craig Key to west end of Seven Mile
Bridge out 20 NM-
Straits of Florida from west end of Seven Mile Bridge to south of
Halfmoon Shoal out 20 NM-
Straits of Florida from Halfmoon Shoal to 20 NM west of Dry
Tortugas out 20 NM-
Straits of Florida from Ocean Reef to Craig Key 20 to 60 NM out-
Straits of Florida from Craig Key to west end of Seven Mile
Bridge 20 to 60 NM out-
Straits of Florida from west end of Seven Mile Bridge to south of
Halfmoon Shoal 20 to 60 NM out-
Straits of Florida from Halfmoon Shoal to 20 NM west of Dry
Tortugas 20 to 60 NM out-
438 AM EDT Fri Sep 11 2026

Corrected first period winds

.TODAY...East to southeast winds 10 to 15 knots, decreasing to 5 to
10 knots. Seas 2 to 3 feet, subsiding to around 2 feet. Wave Detail:
East to southeast 2 feet at 5 seconds. A chance of showers and
thunderstorms.
.TONIGHT...East to southeast winds 10 to 15 knots. Seas 2 to
3 feet. Wave Detail: East 3 feet at 4 seconds. A slight chance of
showers and thunderstorms.
.SATURDAY...Southeast winds 5 to 10 knots. Seas 1 to 2 feet. Wave
Detail: East to southeast 2 feet at 5 seconds. A chance of
showers and thunderstorms.
.SATURDAY NIGHT...Southeast winds near 10 knots. Seas 1 to 2
feet. A chance of showers and thunderstorms.
.SUNDAY...East to southeast winds 5 to 10 knots. Seas 1 to
2 feet. A slight chance of showers and thunderstorms.
.SUNDAY NIGHT...East winds near 10 knots. Seas 1 to 2 feet. A
chance of showers and thunderstorms.
.MONDAY...East winds 5 to 10 knots. Seas 1 to 2 feet. A slight
chance of showers and thunderstorms.
.MONDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 3 feet. A
chance of showers and thunderstorms.
.TUESDAY...Northeast to east winds 10 to 15 knots, increasing to
near 15 knots. Seas 2 to 3 feet. Showers likely with a chance of
thunderstorms.
.TUESDAY NIGHT...Northeast to east winds 15 to 20 knots,
decreasing to near 15 knots. Seas 3 to 4 feet, occasionally to 5
feet. Showers likely with a chance of thunderstorms.

$$

GMZ033-034-112045-
Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM
out and beyond 5 fathoms-
Gulf of America including Dry Tortugas and Rebecca Shoal Channel-
438 AM EDT Fri Sep 11 2026

.TODAY...East to southeast winds 5 to 10 knots. Seas around
1 foot. Wave Detail: East to southeast 1 foot at 3 seconds. A
chance of showers and thunderstorms.
.TONIGHT...East to southeast winds near 10 knots. Seas around
1 foot. Wave Detail: East 1 foot at 3 seconds. A chance of
showers and thunderstorms.
.SATURDAY...Southeast winds near 5 knots. Seas around 1 foot.
Wave Detail: Southeast 1 foot at 4 seconds. A chance of showers
and thunderstorms.
.SATURDAY NIGHT...East to southeast winds 5 to 10 knots. Seas
around 1 foot. A chance of showers and thunderstorms.
.SUNDAY...Southeast winds near 5 knots. Seas 1 foot or less. A
chance of showers and thunderstorms.
.SUNDAY NIGHT...East winds 5 to 10 knots. Seas 1 foot or less. A
chance of showers and thunderstorms.
.MONDAY...East winds near 5 knots. Seas 1 foot or less. A chance
of showers and thunderstorms.
.MONDAY NIGHT...East winds 5 to 10 knots. Seas around 1 foot. A
chance of showers and thunderstorms.
.TUESDAY...Northeast to east winds 10 to 15 knots. Seas 1 to
2 feet. Showers likely with a chance of thunderstorms.
.TUESDAY NIGHT...East winds near 15 knots. Seas 2 to 3 feet.
Showers likely with a chance of thunderstorms.

$$