031
FZUS52 KKEY 271517
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
1017 AM EST Thu Nov 27 2025

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.

Wave Detail will include details about the period and direction
of origin for the highest energy waves. Long-period swells coming
from a different direction than the wind would be included in the
Wave Detail.

GMZ005-280330-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1017 AM EST Thu Nov 27 2025

.SYNOPSIS...A weak pressure field across the area will encourage
light to gentle east to southeast breezes early this afternoon,
but a cold front pushing down the Florida peninsula will arrive to
our marine zones late tonight. Breezes will back to the north and
freshen quickly, and the lingering front will maintain fresh to
strong breezes through the weekend. Small Craft Advisories will be
needed by tonight, and will likely need to be extended through
the end of the weekend. Breezes will gradually slacken over the
beginning of next week. Shower activity will wax and wane
throughout the marine forecast period.

The Approximate Shoreward Edge of the Gulf Stream as of November
22...

35 NM South of Dry Tortugas Light...on Loggerhead Key.
12 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
 6 NM South of Sand Key Light...off Key West.
 7 NM South of Looe Key...off Big Pine Key.
 8 NM Southeast of Sombrero Key Light...off Marathon.
 9 NM Southeast of Alligator Reef Light...off Islamorada.
 3 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 based on products from NASA SPoRT.

$$

GMZ031-280330-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
1017 AM EST Thu Nov 27 2025

...SMALL CRAFT ADVISORY LIKELY WILL BE REQUIRED TONIGHT...

.THIS AFTERNOON...Southeast to south winds 5 to 10 knots,
becoming northeast to east and increasing to near 10 knots. Bay
waters smooth to a light chop, becoming a light chop. Scattered
showers and isolated thunderstorms.
.TONIGHT...Northwest to north winds 10 to 15 knots, becoming north
and increasing to 20 to 25 knots late. Bay waters a light to
moderate chop, becoming very rough. Scattered showers.
.FRIDAY...North to northeast winds 20 to 25 knots, decreasing to
near 20 knots. Bay waters very rough, becoming rough. Isolated
showers.
.FRIDAY NIGHT...Northeast winds near 20 knots. Bay waters rough.
Isolated showers.
.SATURDAY...Northeast to east winds near 20 knots, decreasing to 15
to 20 knots. Bay waters rough, becoming choppy. Isolated showers.
.SATURDAY NIGHT...Northeast to east winds 15 to 20 knots,
decreasing to 10 to 15 knots. Bay waters choppy, becoming a light
to moderate chop. Scattered showers.
.SUNDAY...East winds 10 to 15 knots, decreasing to near 10 knots.
Bay waters a light to moderate chop, becoming a light chop.
Scattered showers.
.SUNDAY NIGHT AND MONDAY...East winds near 10 knots. Bay waters a
light chop. Isolated showers.
.MONDAY NIGHT...East to southeast winds 5 to 10 knots. Bay waters
smooth to a light chop.

$$

GMZ032-035-280330-
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-
1017 AM EST Thu Nov 27 2025

...SMALL CRAFT ADVISORY LIKELY WILL BE REQUIRED TONIGHT...

.THIS AFTERNOON...Southeast to south winds 5 to 10 knots early,
becoming north to northeast and increasing to 10 to 15 knots. Seas
1 foot or less, building to 1 to 2 feet. Nearshore waters smooth
to a light chop, becoming a light to moderate chop. Scattered
showers and isolated thunderstorms.
.TONIGHT...North winds 15 to 20 knots, becoming north to northeast
and increasing to 20 to 25 knots late. Seas 1 to 2 feet, building
to 3 to 5 feet, occasionally to 6 feet. West of the Marquesas
Keys, seas 3 to 5 feet, occasionally to 6 feet, building to 5 to 7
feet, occasionally to 9 feet. Nearshore waters choppy, becoming
very rough. Scattered showers.
.FRIDAY...North to northeast winds 20 to 25 knots. Seas 3 to
5 feet, occasionally to 6 feet, except 6 to 9 feet, occasionally
to 11 feet west of the Marquesas Keys. Nearshore waters very
rough. Isolated showers.
.FRIDAY NIGHT...Northeast winds decreasing to near 20 knots. Seas
3 to 5 feet, occasionally to 6 feet, except 5 to 7 feet,
occasionally to 9 feet west of the Marquesas Keys. Nearshore
waters becoming rough. Isolated showers.
.SATURDAY...Northeast to east winds near 20 knots. Seas 3 to
5 feet, occasionally to 6 feet, except 4 to 6 feet, occasionally
to 8 feet west of the Marquesas Keys. Nearshore waters rough.
Isolated showers.
.SATURDAY NIGHT...East winds near 20 knots, decreasing to 15 to
20 knots. Seas 2 to 4 feet, occasionally to 5 feet, except 4 to 5
feet, occasionally to 6 feet west of the Marquesas Keys. Nearshore
waters rough, becoming choppy. Scattered showers.
.SUNDAY...East winds near 15 knots, decreasing to 10 to 15 knots.
Seas subsiding to 1 to 3 feet. Nearshore waters a moderate chop,
becoming a light to moderate chop. Isolated showers.
.SUNDAY NIGHT AND MONDAY...East winds near 10 knots. Seas 1 to 2
feet. Nearshore waters a light chop. Isolated showers.
.MONDAY NIGHT...East to southeast winds near 10 knots. Seas
around 1 foot. Nearshore waters a light chop.

$$

GMZ042>044-280330-
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-
1017 AM EST Thu Nov 27 2025

...SMALL CRAFT ADVISORY LIKELY WILL BE REQUIRED TONIGHT...

.THIS AFTERNOON...Southeast to south winds near 10 knots,
becoming north to northeast and increasing to 10 to 15 knots. Seas
around 1 foot, building to 1 to 2 feet. Nearshore waters a light
chop, becoming a light to moderate chop. Scattered showers and
isolated thunderstorms.
.TONIGHT...North winds 15 to 20 knots, becoming north to northeast
and increasing to 20 to 25 knots late. Seas 1 to 2 feet, building
to 2 to 3 feet. West of Cosgrove Shoal Light, seas 2 to 4 feet,
occasionally to 5 feet, building to 4 to 6 feet, occasionally to 8
feet. Nearshore waters choppy, becoming very rough. Scattered
showers.
.FRIDAY...North to northeast winds 20 to 25 knots. Seas 2 to
4 feet, occasionally to 5 feet, except 5 to 7 feet, occasionally
to 9 feet west of Cosgrove Shoal Light. Nearshore waters very
rough. Isolated showers.
.FRIDAY NIGHT...Northeast winds 20 to 25 knots, decreasing to near
20 knots. Seas 2 to 4 feet, occasionally to 5 feet, except 5 to 6
feet, occasionally to 8 feet west of Cosgrove Shoal Light.
Nearshore waters very rough, becoming rough. Isolated showers.
.SATURDAY...Northeast to east winds near 20 knots. Seas 3 to
4 feet, occasionally to 5 feet, except 4 to 6 feet, occasionally
to 8 feet west of Cosgrove Shoal Light. Nearshore waters rough.
Isolated showers.
.SATURDAY NIGHT...East winds near 20 knots, decreasing to 15 to
20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Nearshore
waters rough, becoming choppy. Scattered showers.
.SUNDAY...East winds near 15 knots, decreasing to 10 to 15 knots.
Seas 2 to 4 feet, occasionally to 5 feet. Nearshore waters a
moderate chop, becoming a light to moderate chop. Scattered
showers.
.SUNDAY NIGHT...East winds near 10 knots. Seas 2 to 3 feet,
subsiding to around 2 feet. Nearshore waters a light chop.
Isolated showers.
.MONDAY...East winds near 10 knots. Seas 1 to 2 feet. Nearshore
waters a light chop. Isolated showers.
.MONDAY NIGHT...East to southeast winds near 10 knots. Seas
around 1 foot. Nearshore waters a light chop.

$$

GMZ052>055-072>075-280330-
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-
1017 AM EST Thu Nov 27 2025

...SMALL CRAFT ADVISORY LIKELY WILL BE REQUIRED TONIGHT...

.THIS AFTERNOON...Southeast to south winds near 10 knots,
becoming north to northeast and increasing to 10 to 15 knots. Seas
1 to 2 feet, except building to 2 to 3 feet west of Halfmoon
Shoal Light. Wave Detail: East to southeast 2 feet at 4 seconds.
Scattered showers and isolated thunderstorms.
.TONIGHT...North winds 15 to 20 knots, becoming north to northeast
and increasing to 20 to 25 knots late. Seas 2 to 4 feet,
occasionally to 5 feet, building to 4 to 6 feet, occasionally to 8
feet. Wave Detail: North to northeast 3 feet at 4 seconds,
becoming north to northeast 5 feet at 5 seconds. Scattered
showers.
.FRIDAY...North to northeast winds near 25 knots. Seas building to 6
to 9 feet, occasionally to 11 feet. Wave Detail: Northeast 8 feet
at 7 seconds and northwest 4 feet at 8 seconds. Isolated showers.
.FRIDAY NIGHT...North to northeast winds decreasing to 20 to 25
knots. Seas 7 to 9 feet, occasionally to 11 feet. Isolated
showers.
.SATURDAY...Northeast to east winds 20 to 25 knots, decreasing to
near 20 knots. Seas 6 to 8 feet, occasionally to 10 feet.
Scattered showers.
.SATURDAY NIGHT...Northeast to east winds near 20 knots, becoming
east and decreasing to 15 to 20 knots. Seas 5 to 7 feet,
occasionally to 9 feet. Scattered showers.
.SUNDAY...East winds decreasing to 10 to 15 knots. Seas subsiding
to 4 to 6 feet, occasionally to 8 feet. Scattered showers.
.SUNDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 4 feet,
occasionally to 5 feet. Isolated showers.
.MONDAY...East winds 10 to 15 knots. Seas subsiding to 1 to 3
feet. Isolated showers.
.MONDAY NIGHT...East to southeast winds 10 to 15 knots. Seas 1 to
2 feet.

$$

GMZ033-034-280330-
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-
1017 AM EST Thu Nov 27 2025

...SMALL CRAFT ADVISORY LIKELY WILL BE REQUIRED TONIGHT...

.THIS AFTERNOON...Variable winds near 5 knots early, becoming
north to northeast and increasing to 10 to 15 knots. Seas 1 to 2
feet, building to 2 to 3 feet. Wave Detail: North 2 feet at 2
seconds. Scattered showers and isolated thunderstorms.
.TONIGHT...North winds 15 to 20 knots, increasing to 20 to 25
knots late. Seas 4 to 6 feet, occasionally to 8 feet, building to
5 to 8 feet, occasionally to 10 feet. Wave Detail:
Northwest to north 6 feet at 6 seconds, becoming north 6 feet at 7
seconds. Isolated showers.
.FRIDAY...North to northeast winds 20 to 25 knots, increasing to
near 25 knots. Seas 6 to 9 feet, occasionally to 11 feet. Wave
Detail: North 6 feet at 7 seconds.
.FRIDAY NIGHT...Northeast winds 20 to 25 knots. Seas 5 to 7 feet,
occasionally to 9 feet. Isolated showers.
.SATURDAY...Northeast to east winds near 20 knots, decreasing to 15
to 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. Isolated
showers.
.SATURDAY NIGHT...East winds decreasing to 15 to 20 knots. Seas
subsiding to 3 to 5 feet, occasionally to 6 feet. Isolated
showers.
.SUNDAY...East to southeast winds near 15 knots, decreasing to 10
to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Isolated
showers.
.SUNDAY NIGHT...East winds near 10 knots. Seas 2 to 3 feet.
Isolated showers.
.MONDAY...East winds near 10 knots. Seas 1 to 2 feet. Isolated
showers.
.MONDAY NIGHT...East to southeast winds near 10 knots. Seas 1 to 2
feet.

$$