817
FZUS52 KKEY 112032
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
432 PM EDT Tue Aug 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.

GMZ005-120845-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
432 PM EDT Tue Aug 11 2026

.SYNOPSIS...While there are no marine hazard products in place
across the Florida Keys local waters, a Coastal Flood Statement is
in effect for the Lower Keys due to higher water levels around
times of high tide. Anyone on the water should be aware of reduced
clearance underneath fixed bridges over the next few days.
Ridging across Central Florida will shift southwards into Central
and South Florida and weaken over the next couple of days. Gentle
to moderate breezes will trend downwards to a light breeze through
this period, with some directional variability creeping in. Winds
are expected to freshen late in the week as the ridge lifts back
into northern Florida and a broad lower level trough moves
westward across our area. Expect shower and thunderstorm chances
to tick up at that time.

The Approximate Shoreward Edge of the Gulf Stream as of
August 7, 2026...

25 NM South of Dry Tortugas Light...on Loggerhead Key.
15 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
19 NM South of Sand Key Light...off Key West.
29 NM South of Looe Key...off Big Pine Key.
16 NM Southeast of Sombrero Key Light...off Marathon.
 4 NM Southeast of Alligator Reef Light...off Islamorada.
 2 NM Southeast of Molasses Reef Light...off Key Largo.
 1 NM 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.

$$

GMZ031-120845-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
432 PM EDT Tue Aug 11 2026

.TONIGHT...East winds 5 to 10 knots. Bay waters smooth to a light
chop. A slight chance of showers and thunderstorms.
.WEDNESDAY...East to southeast winds near 5 knots. Bay waters
smooth. A slight chance of showers and thunderstorms.
.WEDNESDAY NIGHT...Southeast winds near 5 knots. Bay waters
smooth. A slight chance of showers and thunderstorms.
.THURSDAY...Southeast winds near 5 knots. Bay waters smooth. A
slight chance of showers and thunderstorms.
.THURSDAY NIGHT...East to southeast winds 5 to 10 knots. Bay
waters smooth to a light chop. A slight chance of showers and
thunderstorms.
.FRIDAY...East to southeast winds 5 to 10 knots, increasing to
east 10 to 15 knots in the afternoon. Bay waters smooth to a
light chop, becoming a light to moderate chop. A chance of
showers and thunderstorms.
.FRIDAY NIGHT...East to southeast winds 10 to 15 knots. Bay
waters a light to moderate chop. A chance of showers and
thunderstorms.
.SATURDAY...East to southeast winds 10 to 15 knots. Bay waters a
light to moderate chop. A slight chance of showers and
thunderstorms.
.SATURDAY NIGHT...East winds 10 to 15 knots. Bay waters a light
to moderate chop.
.SUNDAY...East to southeast winds near 10 knots. Bay waters a
light chop.
.SUNDAY NIGHT...East winds 10 to 15 knots, decreasing to 5 to 10
knots. Bay waters a light to moderate chop, becoming smooth to a
light chop.


$$

GMZ032-035-120845-
Bayside and Gulfside from Craig Key to west end of Seven Mile
Bridge-
Gulf of America from west end of Seven Mile Bridge to Halfmoon
Shoal out to 5 Fathoms-
432 PM EDT Tue Aug 11 2026

.TONIGHT...East to southeast winds 5 to 10 knots. Seas around 1
foot. Nearshore waters smooth to a light chop. A slight chance of
showers and thunderstorms.
.WEDNESDAY...East winds 5 to 10 knots, decreasing to near 5 knots.
Seas around 1 foot. Nearshore waters smooth to a light chop,
becoming smooth. A slight chance of showers and thunderstorms.
.WEDNESDAY NIGHT...East winds near 5 knots. Seas 1 foot or less.
Nearshore waters smooth. A slight chance of showers and
thunderstorms.
.THURSDAY...East to southeast winds near 5 knots. Seas 1 foot or
less. Nearshore waters smooth. A slight chance of showers and
thunderstorms.
.THURSDAY NIGHT...East winds near 5 knots, increasing to 5 to 10
knots. Seas 1 foot or less, building to around 1 foot. Nearshore
waters smooth, becoming smooth to a light chop. A slight chance of
showers and thunderstorms.
.FRIDAY...East winds 5 to 10 knots, increasing to 10 to 15 knots.
Seas around 1 foot, building to 1 to 2 feet. Nearshore waters
smooth to a light chop, becoming a light to moderate chop. A
chance of showers and thunderstorms.
.FRIDAY 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.
.SATURDAY...East to southeast winds 10 to 15 knots. Seas 1 to 2
feet. Nearshore waters a light to moderate chop. A slight chance
of showers and thunderstorms.
.SATURDAY NIGHT...East winds 10 to 15 knots. Seas 1 to 2 feet.
Nearshore waters a light to moderate chop. A slight chance of
showers and thunderstorms.
.SUNDAY...East to southeast winds 10 to 15 knots. Seas 1 to
2 feet. Nearshore waters a light to moderate chop.
.SUNDAY NIGHT...East winds 10 to 15 knots, decreasing to 5 to 10
knots. Seas 1 to 2 feet. Nearshore waters a light to moderate
chop, becoming smooth to a light chop.


$$

GMZ042>044-120845-
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-
432 PM EDT Tue Aug 11 2026

.TONIGHT...East winds near 10 knots, decreasing to 5 to 10 knots.
Seas 1 to 2 feet. Nearshore waters smooth to a light chop. A
slight chance of showers and thunderstorms.
.WEDNESDAY...East winds 5 to 10 knots, decreasing to near 5 knots.
Seas 1 to 2 feet. Nearshore waters smooth to a light chop.
.WEDNESDAY NIGHT...East winds near 5 knots, increasing to east to
southeast after midnight. Seas around 1 foot. Nearshore waters
smooth.
.THURSDAY...East to southeast winds near 5 knots. Seas around
1 foot. Nearshore waters smooth. A slight chance of showers and
thunderstorms.
.THURSDAY NIGHT...East winds near 5 knots, increasing to 5 to 10
knots. Seas around 1 foot, building to 1 to 2 feet. Nearshore
waters smooth, becoming smooth to a light chop. A slight chance
of showers and thunderstorms.
.FRIDAY...East winds near 10 knots, increasing to 10 to 15 knots.
Seas 1 to 2 feet. Nearshore waters a light chop, becoming a light
to moderate chop. A chance of showers and thunderstorms.
.FRIDAY NIGHT...East winds 10 to 15 knots, increasing to near 15
knots. Seas building to 2 to 3 feet. Nearshore waters a light to
moderate chop. A chance of showers and thunderstorms.
.SATURDAY...East to southeast winds near 15 knots. Seas 2 to 3
feet. Nearshore waters a moderate chop. A slight chance of
showers and thunderstorms.
.SATURDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 3 feet.
Nearshore waters a light to moderate chop. A slight chance of
showers.
.SUNDAY...East to southeast winds 10 to 15 knots. Seas 2 to
3 feet. Nearshore waters a light to moderate chop.
.SUNDAY NIGHT...East winds 10 to 15 knots, decreasing to near 10
knots. Seas around 2 feet. Nearshore waters a light to moderate
chop.

$$

GMZ052>055-072>075-120845-
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-
432 PM EDT Tue Aug 11 2026

.TONIGHT...East winds 10 to 15 knots, decreasing to near 10 knots.
Seas 2 to 3 feet. Wave Detail: East 3 feet at 5 seconds.
.WEDNESDAY...East winds near 10 knots, decreasing to 5 to 10
knots. Seas 2 to 3 feet, subsiding to 1 to 2 feet. Wave Detail:
East 3 feet at 5 seconds.
.WEDNESDAY NIGHT...East winds 5 to 10 knots. Seas 1 to 2 feet.
Wave Detail: East 2 feet at 4 seconds.
.THURSDAY...East winds 5 to 10 knots, increasing to near 10 knots.
Seas 1 to 2 feet. A slight chance of showers and thunderstorms.
.THURSDAY NIGHT...East winds increasing to 10 to 15 knots. Seas
building to 2 to 3 feet. A slight chance of showers and
thunderstorms.
.FRIDAY...East winds 10 to 15 knots. Seas 2 to 3 feet. A chance
of showers and thunderstorms.
.FRIDAY NIGHT...East winds near 15 knots. Seas 2 to 4 feet,
occasionally to 5 feet. A chance of showers and thunderstorms.
.SATURDAY...East winds 10 to 15 knots. Seas 2 to 3 feet. A slight
chance of showers and thunderstorms.
.SATURDAY NIGHT THROUGH SUNDAY NIGHT...East winds near 15 knots.
Seas 2 to 4 feet, occasionally to 5 feet.

$$

GMZ033-034-120845-
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-
432 PM EDT Tue Aug 11 2026

.TONIGHT...East winds 5 to 10 knots. Seas 1 to 2 feet. Wave
Detail: East 1 foot at 3 seconds. A slight chance of showers and
thunderstorms.
.WEDNESDAY...East winds 5 to 10 knots, becoming variable and
decreasing to near 5 knots. Seas 1 to 2 feet, subsiding to around
1 foot. Wave Detail: East 1 foot at 3 seconds. A slight chance of
showers and thunderstorms.
.WEDNESDAY NIGHT...Northeast winds near 5 knots. Seas 1 foot or
less. A slight chance of showers and thunderstorms.
.THURSDAY...Northeast to east winds near 5 knots. Seas 1 foot or
less. A chance of showers with a slight chance of thunderstorms.
.THURSDAY NIGHT...Northeast to east winds 5 to 10 knots. Seas 1
foot or less. A slight chance of showers and thunderstorms.
.FRIDAY...East winds 5 to 10 knots, increasing to near 10 knots.
Seas around 1 foot, building to 1 to 2 feet. A chance of showers
and thunderstorms.
.FRIDAY NIGHT...East winds 10 to 15 knots. Seas 1 to 2 feet. A
chance of showers and thunderstorms.
.SATURDAY...East to southeast winds 10 to 15 knots. Seas 1 to 2
feet. A slight chance of showers and thunderstorms.
.SATURDAY NIGHT...East winds 10 to 15 knots. Seas 1 to 2 feet. A
slight chance of showers and thunderstorms.
.SUNDAY AND SUNDAY NIGHT...East to southeast winds 5 to 10 knots.
Seas 1 to 2 feet.

$$

DP