241
FZUS52 KKEY 111451
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
1051 AM 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.

GMZ005-120300-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1051 AM EDT Tue Aug 11 2026

.SYNOPSIS...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.

$$

GMZ031-120300-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
1051 AM EDT Tue Aug 11 2026

.THIS AFTERNOON...East to southeast near 10 knots. Bay waters a
light chop. A slight chance of showers and thunderstorms.
.TONIGHT...East winds near 10 knots, decreasing to 5 to 10 knots.
Bay waters a light chop, becoming 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,
increasing to near 10 knots. Bay waters smooth to a light chop,
becoming a light chop. A slight chance of showers and
thunderstorms.
.FRIDAY...East to southeast winds near 10 knots, becoming east
near 15 knots. Bay waters a light chop, becoming a moderate chop.
A chance of showers and thunderstorms.
.FRIDAY NIGHT...East to southeast winds near 15 knots. Bay waters
a 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.

$$

GMZ032-035-120300-
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-
1051 AM EDT Tue Aug 11 2026

.THIS AFTERNOON...East to southeast winds near 10 knots. Seas 1
to 2 feet, except 2 to 3 feet west of the Marquesas Keys,
subsiding to 1 to 2 feet. Nearshore waters a light chop. A slight
chance of showers and thunderstorms.
.TONIGHT...East to southeast winds near 10 knots, decreasing to 5
to 10 knots. Seas 1 to 2 feet. Nearshore waters a light chop,
becoming smooth to a light chop. A slight chance of showers and
thunderstorms.
.WEDNESDAY...East winds 5 to 10 knots, decreasing to near 5 knots
in the afternoon. Seas subsiding to 1 foot or less. 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 5 to 10 knots, increasing to near 10
knots. Seas around 1 foot. Nearshore waters smooth to a light
chop, becoming 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 near 15 knots. Seas 1 to 2 feet, except
2 to 3 feet west of the Marquesas Keys. Nearshore waters a
moderate chop. A chance of showers and thunderstorms.
.SATURDAY...East to southeast winds 10 to 15 knots. Seas around
1 foot. 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.

$$

GMZ042>044-120300-
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-
1051 AM EDT Tue Aug 11 2026

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

$$

GMZ052>055-072>075-120300-
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-
1051 AM EDT Tue Aug 11 2026

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

$$

GMZ033-034-120300-
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-
1051 AM EDT Tue Aug 11 2026

.THIS AFTERNOON...East to southeast winds near 10 knots, becoming
east and decreasing to 5 to 10 knots. Seas 2 to 3 feet, subsiding
to 1 to 2 feet. Wave Detail: East to southeast 2 feet at 4
seconds. A slight chance of showers and thunderstorms.
.TONIGHT...East winds 5 to 10 knots. Seas subsiding to 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 northeast in the
afternoon. Seas 1 to 2 feet. 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 winds 5 to 10 knots, becoming east.
Seas building to 1 to 2 feet. A slight chance of showers and
thunderstorms.
.FRIDAY...East winds 5 to 10 knots. Seas 1 to 2 feet. A chance of
showers and thunderstorms.
.FRIDAY NIGHT...East winds increasing to 10 to 15 knots. Seas 1
to 2 feet. A chance of showers and thunderstorms.
.SATURDAY...East to southeast winds near 10 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.

$$