340
FZUS52 KKEY 032128
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
428 PM EST Wed Dec 3 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.

GMZ005-040930-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
428 PM EST Wed Dec 3 2025

.SYNOPSIS...A cold frontal system will meander across the Florida
Keys tonight. Breezes will veer northeasterly and freshen tonight
and Thursday. High pressure building over the Ohio Valley will
cause winds to veer southeasterly and slacken over the weekend.
Another frontal passage is possible towards the beginning of next
week.

The Approximate Shoreward Edge of the Gulf Stream as of November
28...

28 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.
15 NM South of Looe Key...off Big Pine Key.
15 NM Southeast of Sombrero Key Light...off Marathon.
10 NM Southeast of Alligator Reef Light...off Islamorada.
 9 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.

$$

GMZ031-040930-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
428 PM EST Wed Dec 3 2025

.TONIGHT...Variable winds near 5 knots, becoming northeast and
increasing to 5 to 10 knots. Bay waters smooth, becoming smooth
to a light chop.
.THURSDAY...Northeast to east winds near 10 knots. Bay waters a
light chop.
.THURSDAY NIGHT...Northeast to east winds 10 to 15 knots. Bay
waters a light to moderate chop.
.FRIDAY...East to southeast winds 10 to 15 knots, decreasing to
near 10 knots. Bay waters a light to moderate chop, becoming a
light chop.
.FRIDAY NIGHT...East to southeast winds 5 to 10 knots. Bay waters
smooth to a light chop.
.SATURDAY...Southeast winds 5 to 10 knots. Bay waters smooth to a
light chop. Isolated showers.
.SATURDAY NIGHT...Southeast to south winds 5 to 10 knots,
increasing to near 10 knots. Bay waters smooth to a light chop,
becoming a light chop. Isolated showers.
.SUNDAY...South to southwest winds 10 to 15 knots. Bay waters a
light to moderate chop. Scattered showers.
.SUNDAY NIGHT...Southwest to west winds near 10 knots. Bay waters
a light chop. Scattered showers.
.MONDAY...Northwest winds 10 to 15 knots. Bay waters a light to
moderate chop. Isolated showers.
.MONDAY NIGHT...North winds near 15 knots. Bay waters a moderate
chop. Isolated showers.

$$

GMZ032-035-040930-
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-
428 PM EST Wed Dec 3 2025

.TONIGHT...Northwest to north winds 5 to 10 knots, becoming
northeast and increasing to 10 to 15 knots. Seas building to 1 to
2 feet, except building to 2 to 3 feet west of the Marquesas
Keys. Nearshore waters smooth to a light chop, becoming a light to
moderate chop.
.THURSDAY...Northeast to east winds near 10 knots. Seas 1 to
2 feet, except subsiding to around 2 feet west of the Marquesas
Keys. Nearshore waters a light chop.
.THURSDAY NIGHT...Northeast to east winds 10 to 15 knots. Seas
1 to 2 feet, except around 2 feet west of the Marquesas Keys.
Nearshore waters a light to moderate chop.
.FRIDAY...East to southeast winds 10 to 15 knots, decreasing to
near 10 knots. Seas 1 to 2 feet, subsiding to around 1 foot.
Nearshore waters a light to moderate chop, becoming a light chop.
.FRIDAY NIGHT...East to southeast winds 5 to 10 knots. Seas
subsiding to 1 foot or less. Nearshore waters smooth to a light
chop.
.SATURDAY...Southeast winds 5 to 10 knots. Seas 1 foot or less.
Nearshore waters smooth to a light chop.
.SATURDAY NIGHT...Southeast to south winds 5 to 10 knots. Seas
building to around 1 foot. Nearshore waters smooth to a light
chop. Isolated showers.
.SUNDAY...South to southwest winds near 10 knots, increasing to 10
to 15 knots. Seas around 1 foot, except 1 to 2 feet west of the
Marquesas Keys. Nearshore waters a light chop, becoming a light to
moderate chop. Scattered showers.
.SUNDAY NIGHT...Southwest to west winds near 10 knots. Seas around 1
foot, except 1 to 2 feet west of the Marquesas Keys. Nearshore
waters a light chop. Scattered showers.
.MONDAY...Northwest winds near 10 knots, becoming northwest to
north 10 to 15 knots. Seas 1 to 2 feet, building to 2 to 4 feet,
occasionally to 5 feet. Nearshore waters a light chop, becoming a
light to moderate chop. Isolated showers.
.MONDAY NIGHT...North to northeast winds near 15 knots. Seas 2 to
4 feet, occasionally to 5 feet, except 3 to 5 feet, occasionally
to 6 feet west of the Marquesas Keys. Nearshore waters a moderate
chop. Isolated showers.

$$

GMZ042>044-040930-
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-
428 PM EST Wed Dec 3 2025

.TONIGHT...North to northeast winds 5 to 10 knots, becoming
northeast and increasing to 10 to 15 knots. Seas 1 to 2 feet,
except building to 2 to 3 feet west of Cosgrove Shoal Light.
Nearshore waters smooth to a light chop, becoming a light to
moderate chop.
.THURSDAY...Northeast to east winds 10 to 15 knots. Seas 1 to
2 feet, except subsiding to around 2 feet west of Cosgrove Shoal
Light. Nearshore waters a light to moderate chop.
.THURSDAY NIGHT...Northeast to east winds 10 to 15 knots. Seas
around 2 feet. Nearshore waters a light to moderate chop.
.FRIDAY...East to southeast winds 10 to 15 knots, decreasing to
near 10 knots. Seas subsiding to 1 to 2 feet. Nearshore waters a
light to moderate chop, becoming a light chop.
.FRIDAY NIGHT...East to southeast winds near 10 knots. Seas 1 to
2 feet. Nearshore waters a light chop.
.SATURDAY...Southeast winds near 10 knots. Seas around 1 foot.
Nearshore waters a light chop. Isolated showers.
.SATURDAY NIGHT...Southeast to south 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. Isolated showers.
.SUNDAY...South to southwest winds 10 to 15 knots. Seas 1 to 2
feet. Nearshore waters a light to moderate chop. Scattered
showers.
.SUNDAY NIGHT...Southwest to west winds near 10 knots. Seas
1 to 2 feet, except building to around 2 feet west of Cosgrove
Shoal Light. Nearshore waters a light chop. Scattered showers.
.MONDAY...Northwest winds 10 to 15 knots. Seas 1 to 2 feet,
building to 2 to 4 feet, occasionally to 5 feet. Nearshore waters
a light to moderate chop. Isolated showers.
.MONDAY NIGHT...North to northeast winds near 15 knots. Seas 2 to
4 feet, occasionally to 5 feet, except 3 to 5 feet, occasionally
to 6 feet west of Cosgrove Shoal Light. Nearshore waters a
moderate chop. Isolated showers.

$$

GMZ052>055-072>075-040930-
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-
428 PM EST Wed Dec 3 2025

.TONIGHT...North to northeast winds near 10 knots, becoming
northeast to east and increasing to 10 to 15 knots. Seas 1 to 2
feet, building to 2 to 3 feet. Wave Detail: Northeast 2 feet at 3
seconds and west to northwest 2 feet at 6 seconds.
.THURSDAY...Northeast to east winds 10 to 15 knots. Seas 2 to
3 feet. Wave Detail: Northeast to east 3 feet at 4 seconds and
west to northwest 2 feet at 6 seconds.
.THURSDAY NIGHT...East winds near 15 knots. Seas 2 to 4 feet.
Wave Detail: Northeast to east 3 feet at 5 seconds and west to
northwest 1 foot at 6 seconds.
.FRIDAY...East to southeast winds 10 to 15 knots. Seas 2 to
3 feet.
.FRIDAY NIGHT...East to southeast winds near 10 knots. Seas 2 to
3 feet.
.SATURDAY...Southeast winds near 10 knots. Seas around 2 feet.
Isolated showers.
.SATURDAY NIGHT...Southeast to south winds near 10 knots,
increasing to 10 to 15 knots. Seas 1 to 2 feet, building to
around 2 feet. Scattered showers.
.SUNDAY...South to southwest winds 10 to 15 knots. Seas 2 to 3
feet. Scattered showers.
.SUNDAY NIGHT...Southwest to west winds near 10 knots. Seas
around 2 feet. Scattered showers.
.MONDAY...West to northwest winds 10 to 15 knots, becoming
northwest to north. Seas around 2 feet, building to 2 to 4 feet,
occasionally to 5 feet. Scattered showers.
.MONDAY NIGHT...North to northeast winds 15 to 20 knots. Seas 3 to
4 feet, occasionally to 6 feet, building to 4 to 6 feet,
occasionally to 8 feet. Isolated showers.

$$

GMZ033-034-040930-
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-
428 PM EST Wed Dec 3 2025

.TONIGHT...North to northeast winds near 10 knots, becoming
northeast and increasing to 10 to 15 knots. Seas 2 to 3 feet.
Wave Detail: Northwest 3 feet at 6 seconds.
.THURSDAY...Northeast to east winds 10 to 15 knots, decreasing to
5 to 10 knots. Seas 2 to 3 feet, subsiding to around 2 feet. Wave
Detail: Northeast to east 2 feet at 3 seconds and northwest 2
feet at 6 seconds.
.THURSDAY NIGHT...East winds increasing to 10 to 15 knots. Seas
around 2 feet. Wave Detail: East 2 feet at 3 seconds and
northwest 1 foot at 6 seconds.
.FRIDAY...East to southeast winds 10 to 15 knots, decreasing to near
10 knots. Seas subsiding to 1 to 2 feet.
.FRIDAY NIGHT...East to southeast winds 5 to 10 knots. Seas
around 1 to 2 feet.
.SATURDAY...Southeast winds 5 to 10 knots. Seas around 1 foot.
Isolated showers.
.SATURDAY NIGHT...Southeast to south winds near 10 knots. Seas
around 1 foot. Isolated showers.
.SUNDAY...South to southwest winds near 10 knots. Seas 1 to 2
feet. Scattered showers.
.SUNDAY NIGHT...West to northwest winds near 10 knots. Seas 1 to
2 feet. Isolated showers.
.MONDAY...Northwest to north winds 10 to 15 knots, becoming north.
Seas around 2 feet, building to 2 to 4 feet, occasionally to 5
feet. Isolated showers.
.MONDAY NIGHT...North to northeast winds 15 to 20 knots. Seas
3 to 5 feet, occasionally to 6 feet. Isolated showers.

$$

MJV/AP