734
FZUS52 KKEY 152126
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
426 PM EST Mon Dec 15 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.

GMZ005-160930-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
426 PM EST Mon Dec 15 2025

.SYNOPSIS...The pressure gradient will remain tightened in the
wake of the recent cold front passage and will maintain an
extended period of fresh to strong breezes. Higher pressure
building in during the middle of the week will cause breezes to
slacken for the second half of the week. A weaker front looks to
move through by the end of the week with potentially freshening
breezes for the weekend.

The Approximate Shoreward Edge of the Gulf Stream as of December 15...

26 NM South of Dry Tortugas Light...on Loggerhead Key.
21 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
15 NM South of Sand Key Light...off Key West.
18 NM South of Looe Key...off Big Pine Key.
16 NM Southeast of Sombrero Key Light...off Marathon.
13 NM Southeast of Alligator Reef Light...off Islamorada.
 7 NM Southeast of Molasses Reef Light...off Key Largo.
 3 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.

$$

GMZ031-160930-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
426 PM EST Mon Dec 15 2025

...SMALL CRAFT ADVISORY IN EFFECT...

.TONIGHT...Northeast to east winds 20 to 25 knots. Bay waters
very rough. Scattered showers.
.TUESDAY...Northeast to east winds near 20 knots. Bay waters
rough. Isolated showers.
.TUESDAY NIGHT...Northeast to east winds near 20 knots, decreasing
to 15 to 20 knots. Bay waters rough, becoming choppy.
.WEDNESDAY...East winds near 15 knots. Bay waters a moderate
chop.
.WEDNESDAY NIGHT...East winds 10 to 15 knots. Bay waters a light
to moderate chop.
.THURSDAY...East to southeast winds near 10 knots. Bay waters a
light chop. Isolated showers.
.THURSDAY NIGHT...East to southeast winds near 10 knots, becoming
southeast to south 5 to 10 knots. Bay waters a light chop,
becoming smooth to a light chop. Isolated showers.
.FRIDAY...Southwest to west 5 to 10 knots, becoming west to
northwest. Bay waters smooth to a light chop. Isolated showers.
.FRIDAY NIGHT...Northwest to north winds near 10 knots, becoming
north to northeast. Bay waters a light chop. Isolated showers.
.SATURDAY AND SATURDAY NIGHT...Northeast to east winds 10 to 15
knots. Bay waters a light to moderate chop. Isolated showers.

$$

GMZ032-035-160930-
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-
426 PM EST Mon Dec 15 2025

...SMALL CRAFT ADVISORY IN EFFECT...

.TONIGHT...Northeast winds increasing to 20 to 25 knots. Seas 3
to 5 feet, occasionally to 6 feet, except 5 to 6 feet,
occasionally to 8 feet west of the Marquesas Keys. Nearshore
waters becoming very rough. Isolated showers.
.TUESDAY...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.
.TUESDAY NIGHT...Northeast to 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. Isolated showers.
.WEDNESDAY...East winds near 15 knots. Seas 2 to 3 feet, except 3
to 4 feet, occasionally to 5 feet west of Marquesas Keys.
Nearshore waters a moderate chop.
.WEDNESDAY NIGHT...East winds decreasing to 10 to 15 knots. Seas
1 to 2 feet, except 3 to 4 feet, occasionally to 5 feet west of
the Marquesas Keys. Nearshore waters becoming a light to moderate
chop.
.THURSDAY...East to southeast winds decreasing to near 10 knots.
Seas 1 to 2 feet, except 2 to 3 feet west of the Marquesas Keys.
Nearshore waters becoming a light chop. Isolated showers.
.THURSDAY NIGHT...East to southeast winds near 10 knots, becoming
southeast to south 5 to 10 knots. Seas subsiding to around 1 foot.
Nearshore waters a light chop, becoming smooth to a light chop.
Isolated showers.
.FRIDAY...Southwest to west winds 5 to 10 knots, becoming
northwest to north near 10 knots. Seas 1 foot or less, building to
around 1 foot, except building to 1 to 2 feet west of the
Marquesas Keys. Nearshore waters smooth to a light chop, becoming
a light chop. Isolated showers.
.FRIDAY NIGHT...North to northeast winds increasing to 10 to 15
knots. Seas 1 to 2 feet. Nearshore waters becoming a light to
moderate chop. Isolated showers.
.SATURDAY...Northeast to east winds 10 to 15 knots. Seas 1 to
2 feet, except 2 to 3 feet west of the Marquesas Keys. Nearshore
waters a light to moderate chop. Isolated showers.
.SATURDAY NIGHT...East winds 10 to 15 knots. Seas 1 to 2 feet,
except 2 to 3 feet west of the Marquesas Keys. Nearshore waters a
light to moderate chop. Isolated showers.

$$

GMZ042>044-160930-
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-
426 PM EST Mon Dec 15 2025

...SMALL CRAFT ADVISORY IN EFFECT...

.TONIGHT...Northeast winds 20 to 25 knots. Seas 3 to 5 feet,
occasionally to 6 feet, except 5 to 6 feet, occasionally to
8 feet west of Cosgrove Shoal Light. Nearshore waters very rough.
Scattered showers.
.TUESDAY...Northeast to east winds 20 to 25 knots. Seas 3 to 5
feet, occasionally to 6 feet, except 4 to 6 feet, occasionally to
8 feet west of Cosgrove Shoal Light. Nearshore waters very rough.
Isolated showers.
.TUESDAY NIGHT...Northeast to east winds near 20 knots, decreasing
to 15 to 20 knots after midnight. Seas 3 to 5 feet, occasionally
to 6 feet. Nearshore waters rough, becoming choppy. Isolated
showers.
.WEDNESDAY...East winds 15 to 20 knots, decreasing to near 15
knots. Seas 2 to 4 feet, occasionally to 5 feet. Nearshore waters
choppy, becoming a moderate chop. Isolated showers.
.WEDNESDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 4 feet,
occasionally to 5 feet. Nearshore waters a light to moderate
chop. Isolated showers.
.THURSDAY...East to southeast winds decreasing to near 10 knots.
Seas 2 to 3 feet. Nearshore waters becoming a light chop.
Isolated showers.
.THURSDAY NIGHT...East to southeast winds near 10 knots, becoming
southeast to south 5 to 10 knots. Seas 2 to 3 feet, subsiding to 1
to 2 feet. Nearshore waters a light chop, becoming smooth to a
light chop. Isolated showers.
.FRIDAY...Southwest to west winds 5 to 10 knots, becoming
northwest to north near 10 knots. Seas around 1 foot, except
building to 1 to 2 feet west of Cosgrove Shoal Light. Nearshore
waters smooth to a light chop, becoming a light chop. Isolated
showers.
.FRIDAY NIGHT...Northwest to north winds near 10 knots, becoming
north to northeast 10 to 15 knots. Seas 1 to 2 feet. Nearshore
waters a light chop, becoming a light to moderate chop. Isolated
showers.
.SATURDAY...Northeast to east winds 10 to 15 knots. Seas 2 to
3 feet. Nearshore waters a light to moderate chop. Isolated
showers.
.SATURDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 3 feet.
Nearshore waters a light to moderate chop. Isolated showers.

$$

GMZ052>055-072>075-160930-
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-
426 PM EST Mon Dec 15 2025

...SMALL CRAFT ADVISORY IN EFFECT...

.TONIGHT...Northeast winds 20 to 25 knots, increasing to near 25
knots. Seas 7 to 9 feet, occasionally to 11 feet. Wave Detail:
Northeast to east 9 feet at 7 seconds and northwest to north 3
feet at 8 seconds. Numerous showers.
.TUESDAY...Northeast to east winds 20 to 25 knots. Seas 6 to
9 feet, occasionally to 11 feet. Wave Detail: Northeast to east
8 feet at 8 seconds and northwest 2 feet at 7 seconds. Scattered
showers.
.TUESDAY NIGHT...Northeast to east winds 20 to 25 knots,
decreasing to near 20 knots late. Seas 6 to 8 feet, occasionally
to 10 feet. Wave Detail: Northeast to east 8 feet at 7 seconds.
Isolated showers.
.WEDNESDAY...East winds near 20 knots early, decreasing to15 to
20 knots. Seas 5 to 7 feet, occasionally to 9 feet, subsiding to
4 to 6 feet, occasionally to 8 feet. Isolated showers.
.WEDNESDAY NIGHT...East winds near 15 knots. Seas 4 to 6 feet,
occasionally to 8 feet. Isolated showers.
.THURSDAY...East to southeast winds 10 to 15 knots. Seas 3 to
5 feet, occasionally to 6 feet. Isolated showers.
.THURSDAY NIGHT...East to southeast winds 10 to 15 knots,
becoming southeast to south near 10 knots. Seas 2 to 4 feet,
occasionally to 5 feet, subsiding to 2 to 3 feet. Isolated
showers.
.FRIDAY...Southwest to west winds near 10 knots, becoming
northwest to north in the afternoon. Seas around 2 feet. Isolated
showers.
.FRIDAY NIGHT...North to northeast winds 10 to 15 knots. Seas
2 to 3 feet. Isolated showers.
.SATURDAY...Northeast to east winds 10 to 15 knots, increasing to
near 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Isolated
showers.
.SATURDAY NIGHT...East winds near 15 knots. Seas 3 to 4 feet,
occasionally to 5 feet. Isolated showers.

$$

GMZ033-034-160930-
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-
426 PM EST Mon Dec 15 2025

...SMALL CRAFT ADVISORY IN EFFECT...

.TONIGHT...Northeast winds near 20 knots early, increasing to 20
to 25 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave
Detail: North 6 feet at 7 seconds. Isolated showers.
.TUESDAY...Northeast winds 20 to 25 knots, briefly decreasing to 15
to 20 knots in the afternoon. Seas 4 to 6 feet, occasionally to 8
feet. Wave Detail: Northeast 6 feet at 6 seconds.
.TUESDAY NIGHT...Northeast to east winds near 20 knots, decreasing
to 15 to 20 knots after midnight. Seas 3 to 5 feet, occasionally
to 6 feet. Wave Detail: Northeast to east 4 feet at 5 seconds.
Isolated showers.
.WEDNESDAY...Northeast to east winds near 15 knots, becoming east
10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Isolated
showers.
.WEDNESDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 4 feet,
occasionally to 5 feet. Isolated showers.
.THURSDAY...East to southeast winds 10 to 15 knots, decreasing to
near 10 knots. Seas 2 to 3 feet. Isolated showers.
.THURSDAY NIGHT...East to southeast winds near 10 knots, becoming
south to southwest 5 to 10 knots. Seas 1 to 2 feet. Isolated
showers.
.FRIDAY...West to northwest winds 5 to 10 knots, becoming
northwest to north near 10 knots. Seas 1 to 2 feet. Isolated
showers.
.FRIDAY NIGHT...North to northeast winds 10 to 15 knots. Seas
1 to 2 feet, building to 2 to 3 feet. Isolated showers.
.SATURDAY...Northeast to east winds 10 to 15 knots. Seas 2 to
3 feet. Isolated showers.
.SATURDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 3 feet.
Isolated showers.

$$

DP/LIW