311
FZUS52 KKEY 122123
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
423 PM EST Fri Dec 12 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.

GMZ005-130930-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
423 PM EST Fri Dec 12 2025

.SYNOPSIS...High pressure drifting eastward into the western
North Atlantic will result in gentle to moderate northeast to
east breezes tonight. The next frontal boundary is progged to
push through the Florida Keys marine zones on Sunday night. Ahead
of the front, elevated chances for showers and thunderstorms will
be possible late Saturday through early Sunday. In the wake of the
frontal passage, fresh to strong northeasterly breezes are
expected Sunday night through at least Tuesday.

The Approximate Shoreward Edge of the Gulf Stream as of December 8...

15 NM South of Dry Tortugas Light...on Loggerhead Key.
13 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
14 NM South of Sand Key Light...off Key West.
18 NM South of Looe Key...off Big Pine Key.
23 NM Southeast of Sombrero Key Light...off Marathon.
18 NM Southeast of Alligator Reef Light...off Islamorada.
12 NM Southeast of Molasses Reef Light...off Key Largo.
 8 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 and RTOFS.

$$

GMZ031-130930-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
423 PM EST Fri Dec 12 2025

.TONIGHT...Northeast to east winds near 10 knots. Bay waters a
light chop. Isolated showers.
.SATURDAY...Northeast to east winds near 10 knots, increasing to
10 to 15 knots. Bay waters a light chop, becoming a light to
moderate chop. Scattered showers.
.SATURDAY NIGHT...East winds 10 to 15 knots, becoming variable
and decreasing to 5 to 10 knots. Bay waters a light to moderate
chop, becoming smooth to a light chop. Numerous showers and
isolated thunderstorms.
.SUNDAY...North to northeast winds 5 to 10 knots, becoming north
and increasing to near 10 knots. Bay waters smooth to a light
chop, becoming a light chop. Scattered showers and isolated
thunderstorms.
.SUNDAY NIGHT...North winds 10 to 15 knots, increasing to 15 to 20
knots. Bay waters a light to moderate chop, becoming choppy.
Isolated showers.
.MONDAY...Northeast winds near 20 knots. Bay waters rough.
Isolated showers.
.MONDAY NIGHT...Northeast winds near 20 knots. Bay waters rough.
Isolated showers.
.TUESDAY...Northeast winds 15 to 20 knots. Bay waters choppy.
Isolated showers.
.TUESDAY NIGHT...Northeast to east winds near 15 knots. Bay
waters a moderate chop. Isolated showers.
.WEDNESDAY...East winds near 15 knots. Bay waters a moderate
chop. Isolated showers.
.WEDNESDAY NIGHT...East winds 10 to 15 knots. Bay waters a light
to moderate chop. Isolated showers.

$$

GMZ032-035-130930-
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-
423 PM EST Fri Dec 12 2025

.TONIGHT...Northeast to east winds near 10 knots. Seas 1 to 2
feet. Nearshore waters a light chop. Isolated showers.
.SATURDAY...Northeast to 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. Scattered showers.
.SATURDAY NIGHT...East winds 10 to 15 knots, becoming northeast to
east and decreasing to 5 to 10 knots. Seas 1 to 2 feet. Nearshore
waters a light to moderate chop, becoming smooth to a light chop.
Numerous showers and isolated thunderstorms.
.SUNDAY...Northeast winds 5 to 10 knots, becoming north and
increasing to 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters
smooth to a light chop, becoming a light to moderate chop.
Scattered showers and isolated thunderstorms.
.SUNDAY NIGHT...North winds 10 to 15 knots, becoming north to
northeast 15 to 20 knots. Seas 1 to 2 feet, building to 2 to 3
feet. West of the Marquesas Keys, seas 2 to 3 feet, building to 3
to 4 feet, occasionally to 5 feet. Nearshore waters a light to
moderate chop, becoming choppy. Isolated showers.
.MONDAY...North to northeast winds near 20 knots. Seas 2 to 4
feet, occasionally to 5 feet, except 4 to 6 feet, occasionally to
8 feet west of the Marquesas Keys. Nearshore waters rough.
Isolated showers.
.MONDAY NIGHT...North to northeast winds near 20 knots. Seas 2 to
4 feet, occasionally to 5 feet, except 4 to 6 feet, occasionally
to 8 feet west of the Marquesas Keys. Nearshore waters rough.
Isolated showers.
.TUESDAY AND TUESDAY NIGHT...Northeast winds 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 choppy. Isolated showers.
.WEDNESDAY AND WEDNESDAY NIGHT...East winds near 15 knots. Seas 2
to 3 feet. Nearshore waters a moderate chop. Isolated showers.

$$

GMZ042>044-130930-
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-
423 PM EST Fri Dec 12 2025

.TONIGHT...East winds 10 to 15 knots. Seas 1 to 2 feet, building
to around 2 feet. Nearshore waters a light to moderate chop.
Isolated showers.
.SATURDAY...Northeast to east winds 10 to 15 knots. Seas around 2
feet. Nearshore waters a light to moderate chop. Scattered
showers.
.SATURDAY NIGHT...East winds 10 to 15 knots, becoming northeast
and decreasing to 5 to 10 knots. Seas around 2 feet, subsiding to 1
to 2 feet. Nearshore waters a light to moderate chop, becoming
smooth to a light chop. Numerous showers and isolated
thunderstorms.
.SUNDAY...North to northeast winds 5 to 10 knots increasing to 10
to 15 knots. Seas around 1 foot, building to 1 to 2 feet. West of
Cosgrove Shoal Light, seas 1 to 2 feet, building to 2 to 3 feet.
Nearshore waters smooth to a light chop, becoming a light to
moderate chop. Scattered showers and isolated thunderstorms.
.SUNDAY NIGHT...North winds 10 to 15 knots, becoming north to
northeast and increasing to near 20 knots. Seas 2 to 3 feet, building
to 3 to 4 feet, occasionally to 5 feet. Nearshore waters a light
to moderate chop, becoming rough. Isolated showers.
.MONDAY...Northeast winds near 20 knots. Seas 2 to 4 feet,
occasionally to 5 feet, except 4 to 5 feet, occasionally to 6 feet
west of Cosgrove Shoal Light. Nearshore waters rough. Isolated
showers.
.MONDAY NIGHT...Northeast winds near 20 knots. Seas 2 to 4 feet,
occasionally to 5 feet, except 4 to 5 feet, occasionally to 6 feet
west of Cosgrove Shoal Light. Nearshore waters rough. Isolated
showers.
.TUESDAY AND TUESDAY NIGHT...Northeast winds 15 to 20 knots. Seas
2 to 3 feet, except 3 to 5 feet, occasionally to 6 feet west of
Cosgrove Shoal Light. Nearshore waters choppy. Isolated showers.
.WEDNESDAY...East winds near 15 knots. Seas 2 to 3 feet.
Nearshore waters a moderate chop. Isolated showers.
.WEDNESDAY NIGHT...East winds near 15 knots. Seas 2 to 4 feet,
occasionally to 5 feet. Nearshore waters a moderate chop.
Isolated showers.

$$

GMZ052>055-072>075-130930-
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-
423 PM EST Fri Dec 12 2025

.TONIGHT...East winds 10 to 15 knots. Seas 2 to 3 feet, building
to around 3 feet. Wave Detail: Northeast to east 3 feet at 4
seconds. Isolated showers.
.SATURDAY...East winds 10 to 15 knots. Seas around 3 feet. Wave
Detail: East 3 feet at 5 seconds and northwest 1 foot at
5 seconds. Scattered showers.
.SATURDAY NIGHT...East winds 10 to 15 knots, becoming northeast
to east and decreasing to 5 to 10 knots. Seas 2 to 4 feet,
occasionally to 5 feet. Wave Detail: East 3 feet at 5 seconds.
Numerous showers and isolated thunderstorms.
.SUNDAY...North to northeast winds 5 to 10 knots, becoming north
and increasing to 10 to 15 knots. Seas 2 to 3 feet. Scattered
showers and isolated thunderstorms.
.SUNDAY NIGHT...North to northeast winds 10 to 15 knots,
increasing to near 20 knots. Seas 2 to 3 feet, building to 3 to 5
feet, occasionally to 6 feet. Scattered showers.
.MONDAY...Northeast winds near 20 knots. Seas 5 to 7 feet,
occasionally to 9 feet. Isolated showers.
.MONDAY NIGHT...Northeast winds near 20 knots. Seas 5 to 7 feet,
occasionally to 9 feet. Isolated showers.
.TUESDAY...Northeast winds near 20 knots. Seas 5 to 7 feet,
occasionally to 9 feet. Isolated showers.
.TUESDAY NIGHT...Northeast to east winds 15 to 20 knots. Seas
4 to 6 feet, occasionally to 8 feet. Isolated showers.
.WEDNESDAY...East winds near 15 knots. Seas 4 to 5 feet,
occasionally to 6 feet. Isolated showers.
.WEDNESDAY NIGHT...East winds 15 to 20 knots. Seas 4 to 6 feet,
occasionally to 8 feet. Isolated showers.

$$

GMZ033-034-130930-
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-
423 PM EST Fri Dec 12 2025

.TONIGHT...Northeast to east winds 10 to 15 knots. Seas 2 to 3 feet.
Wave Detail: East 2 feet at 3 seconds and northwest 2 feet at 6
seconds. Isolated showers.
.SATURDAY...Northeast to east winds 10 to 15 knots. Seas 2 to 3
feet. Wave Detail: Northeast to east 2 feet at 4 seconds and
northwest 1 foot at 5 seconds. Scattered showers.
.SATURDAY NIGHT...East winds 10 to 15 knots, decreasing to 5 to
10 knots. Seas subsiding to 1 to 2 feet. Wave Detail: East
2 feet at 4 seconds. Numerous showers and isolated thunderstorms.
.SUNDAY...North to northeast winds 5 to 10 knots, increasing to 10
to 15 knots. Seas 1 to 2 feet, building to 2 to 3 feet. Scattered
showers and isolated thunderstorms.
.SUNDAY NIGHT...North to northeast winds 15 to 20 knots. Seas
building to 3 to 5 feet, occasionally to 6 feet. Isolated
showers.
.MONDAY...Northeast winds near 20 knots. Seas 4 to 6 feet,
occasionally to 8 feet. Isolated showers.
.MONDAY NIGHT...Northeast winds near 20 knots. Seas 4 to 6 feet,
occasionally to 8 feet. Isolated showers.
.TUESDAY...Northeast to east winds near to 20 knots, decreasing to 15
to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Isolated
showers.
.TUESDAY NIGHT...Northeast to east winds 15 to 20 knots. Seas
2 to 4 feet, occasionally to 5 feet. Isolated showers.
.WEDNESDAY AND WEDNESDAY NIGHT...East winds near 15 knots. Seas 2
to 3 feet. Isolated showers.

$$