311
FZUS52 KKEY 142030
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
430 PM EDT Fri Aug 14 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.

GMZ005-150830-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
430 PM EDT Fri Aug 14 2026

.SYNOPSIS...High pressure in the central North Atlantic will
strengthen and build westward for the next several days. With the
associated ridge axis located north of the Florida Keys, this will
support gentle to moderate east to southeast breezes for the
marine zones through Sunday night. A weak frontal boundary will
stall over the Florida Peninsula for early next week. This will
disrupt the ridge`s influence on the Keys coastal waters. Breezes
will respond, becoming light to gentle.

The Approximate Shoreward Edge of the Gulf Stream as of
August 13, 2026...

38 NM South of Dry Tortugas Light...on Loggerhead Key.
20 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
17 NM South of Sand Key Light...off Key West.
21 NM South of Looe Key...off Big Pine Key.
18 NM Southeast of Sombrero Key Light...off Marathon.
 7 NM Southeast of Alligator Reef Light...off Islamorada.
 7 NM Southeast of Molasses Reef Light...off Key Largo.
 2 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.

$$

GMZ031-150830-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
430 PM EDT Fri Aug 14 2026

.TONIGHT...East to southeast winds near 15 knots. Bay waters a
moderate chop. Showers likely with a chance of thunderstorms.
Winds stronger and bay waters rougher in and around showers
thunderstorms.
.SATURDAY...East to southeast winds near 15 knots, decreasing to
10 to 15 knots. Bay waters a moderate chop, becoming a light to
moderate chop. A chance of showers and thunderstorms.
.SATURDAY NIGHT...East to southeast winds near 15 knots. Bay
waters a moderate chop. A slight chance of showers and
thunderstorms.
.SUNDAY...East to southeast winds 10 to 15 knots. Bay waters a
light to moderate chop.
.SUNDAY NIGHT...East to southeast winds 10 to 15 knots, becoming
east and decreasing to near 10 knots. Bay waters a light to
moderate chop, becoming a light chop.
.MONDAY...East winds 5 to 10 knots, becoming southeast to south.
Bay waters smooth to a light chop. A slight chance of showers and
thunderstorms.
.MONDAY NIGHT...South to southwest winds near 5 knots, becoming
west to northwest around 5 knots after midnight. Bay waters
smooth.
.TUESDAY...Variable winds near 5 knots, becoming southwest 5 to
10 knots in the afternoon. Bay waters smooth, becoming smooth to
a light chop.
.TUESDAY NIGHT...West winds near 5 knots. Bay waters smooth.
.WEDNESDAY...Southwest to west winds near 5 knots, becoming south
to southwest in the afternoon. Bay waters smooth. A slight chance
of showers.
.WEDNESDAY NIGHT...South to southwest winds near 5 knots. Bay
waters smooth.

$$

GMZ032-035-150830-
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-
430 PM EDT Fri Aug 14 2026

.TONIGHT...East to southeast winds near 15 knots. Seas 1 to 2
feet, except around 2 feet west of the Marquesas Keys. Nearshore
waters a moderate chop. Showers likely with a chance of
thunderstorms. Winds stronger and nearshore waters rougher in and
around showers and thunderstorms.
.SATURDAY...East to southeast winds near 15 knots, decreasing to
10 to 15 knots. Seas 1 to 2 feet, except around 2 feet west of
the Marquesas Keys. Nearshore waters a moderate chop, becoming a
light to moderate chop. A chance of showers and thunderstorms.
.SATURDAY NIGHT...East to southeast winds near 15 knots. Seas 1
to 2 feet, except 2 to 3 feet west of the Marquesas Keys.
Nearshore waters a chop. A slight chance of showers and
thunderstorms.
.SUNDAY...East to southeast winds 10 to 15 knots. Seas 1 to 2
feet, except subsiding to around 2 feet west of the Marquesas
Keys. Nearshore waters a light to moderate chop.
.SUNDAY NIGHT...East to southeast winds 10 to 15 knots, becoming
east and decreasing to near 10 knots. Seas 1 to 2 feet. Nearshore
waters a light to moderate chop, becoming a light chop.
.MONDAY...Northeast to east winds 5 to 10 knots, becoming variable
near 5 knots. Seas around 1 foot. Nearshore waters smooth to a
light chop, becoming smooth. A slight chance of showers and
thunderstorms.
.MONDAY NIGHT...Northeast winds near 5 knots. Seas 1 foot or
less. Nearshore waters smooth.
.TUESDAY...North to northeast winds near 5 knots, becoming
northwest in the afternoon. Seas 1 foot or less. Nearshore waters
smooth.
.TUESDAY NIGHT...Northwest winds near 5 knots. Seas 1 foot or
less. Nearshore waters smooth.
.WEDNESDAY...Northeast winds near 5 knots, becoming southwest to
west in the afternoon. Seas 1 foot or less. Nearshore waters
smooth.
.WEDNESDAY NIGHT...West to northwest winds near 5 knots, becoming
southeast. Seas 1 foot or less. Nearshore waters smooth. A slight
chance of showers.

$$

GMZ042>044-150830-
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-
430 PM EDT Fri Aug 14 2026

...SMALL CRAFT SHOULD EXERCISE CAUTION FOR INCREASING WINDS...

.TONIGHT...East to southeast winds near 15 knots, increasing to 15
to 20 knots. Seas 2 to 3 feet. Nearshore waters a moderate chop,
becoming choppy. Showers likely with a chance of thunderstorms.
Winds stronger and seas higher in and around showers and
thunderstorms.
.SATURDAY...East to southeast winds near 15 knots, decreasing to
10 to 15 knots. Seas 2 to 3 feet, subsiding to around 2 feet.
Nearshore waters a moderate chop, becoming a light to moderate
chop. A chance of showers and thunderstorms.
.SATURDAY NIGHT...East to southeast winds near 15 knots. Seas 2
to 3 feet. Nearshore waters a moderate chop. A slight chance of
showers and thunderstorms.
.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, becoming a light chop.
.MONDAY...Northeast to east winds 5 to 10 knots, becoming variable
near 5 knots. Seas around 2 feet, subsiding to 1 to 2 feet.
Nearshore waters smooth to a light chop. A slight chance of
showers and thunderstorms.
.MONDAY NIGHT...East winds near 5 knots. Seas around 1 foot.
Nearshore waters smooth.
.TUESDAY...Northeast winds near 5 knots, becoming northwest to
north in the afternoon. Seas around 1 foot. Nearshore waters
smooth.
.TUESDAY NIGHT...Northwest to north winds near 5 knots. Seas
1 foot or less. Nearshore waters smooth.
.WEDNESDAY...Northeast to east winds near 5 knots, becoming south.
Seas 1 foot or less. Nearshore waters smooth.
.WEDNESDAY NIGHT...North to northeast winds near 5 knots,
becoming east to southeast after midnight. Seas 1 foot or less.
Nearshore waters smooth.

$$

GMZ052>055-072>075-150830-
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-
430 PM EDT Fri Aug 14 2026

...SMALL CRAFT SHOULD EXERCISE CAUTION FOR INCREASING WINDS...

.TONIGHT...East to southeast winds near 15 knots, increasing to 15
to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave
Detail: East 4 feet at 5 seconds. Showers likely with a chance of
thunderstorms. Winds stronger and seas higher in and around
showers and thunderstorms.
.SATURDAY...East to southeast winds near 15 knots decreasing to 10
to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave
Detail: East to southeast 3 feet at 5 seconds. A chance of showers
and thunderstorms.
.SATURDAY NIGHT...East to southeast winds 15 to 20 knots. Seas
3 to 4 feet, occasionally to 5 feet. Wave Detail: East to
southeast 5 feet at 6 seconds. A slight chance of showers and
thunderstorms.
.SUNDAY...East to southeast winds near 15 knots, decreasing to 10
to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet.
.SUNDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 3 feet.
.MONDAY...East winds near 10 knots, decreasing to 5 to 10 knots.
Seas 2 to 3 feet, subsiding to around 2 feet.
.MONDAY NIGHT...East winds 5 to 10 knots. Seas 1 to 2 feet.
.TUESDAY...Northeast to east winds 5 to 10 knots. Seas 1 to
2 feet.
.TUESDAY NIGHT...East winds 5 to 10 knots. Seas around 1 foot.
.WEDNESDAY...East winds near 5 knots. Seas around 1 foot.
.WEDNESDAY NIGHT...East winds 5 to 10 knots. Seas around 1 foot.

$$

GMZ033-034-150830-
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-
430 PM EDT Fri Aug 14 2026

.TONIGHT...East winds 10 to 15 knots, becoming east to southeast.
Seas 1 to 2 feet, building to 2 to 3 feet. Wave Detail: East 2
feet at 4 seconds. Showers likely with a chance of thunderstorms.
Winds stronger and seas higher in and around showers and
thunderstorms.
.SATURDAY...East to southeast winds 10 to 15 knots, decreasing to
near 10 knots. Seas 2 to 3 feet, subsiding to 1 to 2 feet. Wave
Detail: East to southeast 2 feet at 4 seconds. A chance of showers
and thunderstorms.
.SATURDAY NIGHT...East to southeast winds 10 to 15 knots,
increasing to near 15 knots. Seas around 2 feet, building to 2 to
3 feet. Wave Detail: East to southeast 2 feet at 4 seconds. A
slight chance of showers and thunderstorms.
.SUNDAY...East winds 10 to 15 knots, decreasing to near 10 knots.
Seas 2 to 3 feet, subsiding to 1 to 3 feet.
.SUNDAY NIGHT...East winds near 10 knots. Seas 1 to 2 feet.
.MONDAY...Northeast to east winds 5 to 10 knots, becoming variable
near 5 knots. Seas 1 to 2 feet.
.MONDAY NIGHT...North to northeast winds near 5 knots. Seas
1 foot or less.
.TUESDAY...North winds near 5 knots. Seas around 1 foot.
.TUESDAY NIGHT...Northwest to north winds near 5 knots. Seas
around 1 foot.
.WEDNESDAY...Northwest to north winds near 5 knots. Seas around
1 foot. A slight chance of showers.
.WEDNESDAY NIGHT...North winds near 5 knots. Seas around 1 foot.
A slight chance of showers and thunderstorms.

$$

MJV/BT