452
FZUS52 KKEY 070919
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
419 AM EST Sun Dec 7 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.

GMZ005-072130-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
419 AM EST Sun Dec 7 2025

.SYNOPSIS...The Florida Keys will remain in a col region through
this afternoon. This will promote mainly light to gentle
southeast breezes, occasionally becoming variable. Thereafter, a
weather system will move out of the ArkLaTex region and into the
Southeast U.S. by this evening. The attendent cold front will
sweep through Monday night with a brief period of moderate to
fresh breezes. The potential exists for a more active weather
pattern as the front stalls out across the Straits of Florida for
most of the week.

The Approximate Shoreward Edge of the Gulf Stream as of December 4...

21 NM South of Dry Tortugas Light...on Loggerhead Key.
21 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
22 NM South of Sand Key Light...off Key West.
15 NM South of Looe Key...off Big Pine Key.
 8 NM Southeast of Sombrero Key Light...off Marathon.
 6 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.

$$

GMZ031-072130-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
419 AM EST Sun Dec 7 2025

.TODAY...East to southeast winds near 5 knots, becoming southeast
to south 5 to 10 knots. Bay waters smooth, becoming smooth to a
light chop. Isolated showers.
.TONIGHT...South to southwest winds 5 to 10 knots, becoming
southwest to west near 10 knots. Bay waters smooth to a light chop,
becoming a light chop. Scattered showers and isolated
thunderstorms.
.MONDAY...Southwest to west winds 10 to 15 knots, becoming west
near 15 knots. Bay waters a light to moderate chop, becoming a
moderate chop. Scattered showers and isolated thunderstorms.
.MONDAY NIGHT...West to northwest winds 10 to 15 knots, becoming
north to northeast. Bay waters a light to moderate chop.
Scattered showers.
.TUESDAY...North to northeast winds near 15 knots, decreasing to
10 to 15 knots. Bay waters a moderate chop, becoming a light to
moderate chop. Scattered showers.
.TUESDAY NIGHT...Northeast winds 10 to 15 knots, decreasing to
near 10 knots. Bay waters a light to moderate chop, becoming a
light chop. Scattered showers.
.WEDNESDAY...Northeast to east winds near 10 knots, becoming west
to northwest 5 to 10 knots. Bay waters a light chop, becoming smooth
to a light chop. Isolated showers.
.WEDNESDAY NIGHT...Northwest to north winds increasing to near 10
knots. Bay waters becoming a light chop. Isolated showers.
.THURSDAY...North to northeast winds near 10 knots, decreasing to
5 to 10 knots. Bay waters a light chop, becoming smooth to a light
chop. Isolated showers.
.THURSDAY NIGHT...Northeast to east winds 5 to 10 knots. Bay
waters smooth to a light chop. Isolated showers.

$$

GMZ032-035-072130-
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-
419 AM EST Sun Dec 7 2025

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

$$

GMZ042>044-072130-
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-
419 AM EST Sun Dec 7 2025

.TODAY...Southeast winds 5 to 10 knots, becoming south and briefly
increasing to near 10 knots this afternoon. Seas around 1 foot.
Nearshore waters smooth to a light chop, becoming a light chop.
Isolated showers.
.TONIGHT...South to southwest winds 5 to 10 knots, becoming
southwest to west 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. Scattered
showers and isolated thunderstorms.
.MONDAY...Southwest to west winds 10 to 15 knots, increasing to
near 15 knots. Seas building to 1 to 2 feet, except building to 2
to 3 feet west of Cosgrove Shoal Light. Nearshore waters a light
to moderate chop, becoming a moderate chop. Scattered showers and
isolated thunderstorms.
.MONDAY NIGHT...Northwest winds near 15 knots, becoming north
to northeast. Seas 1 to 2 feet, except 2 to 3 feet west of
Cosgrove Shoal Light. Nearshore waters a moderate chop. Scattered
showers and isolated thunderstorms.
.TUESDAY...Northeast winds near 15 knots, decreasing to 10 to 15
knots. Seas 1 to 2 feet, except 2 to 4 feet, occasionally to 5
feet west of Cosgrove Shoal Light. Nearshore waters a moderate
chop, becoming a light to moderate chop. Scattered showers.
.TUESDAY NIGHT...Northeast winds 10 to 15 knots. Seas 1 to
2 feet, except 3 to 4 feet, occasionally to 5 feet west of
Cosgrove Shoal Light. Nearshore waters a light to moderate chop.
Scattered showers.
.WEDNESDAY...Northeast winds near 10 knots, becoming west to
northwest 5 to 10 knots. Seas 1 to 2 feet, except 2 to 3 feet
west of Cosgrove Shoal Light. Nearshore waters a light chop,
becoming smooth to a light chop. Isolated showers.
.WEDNESDAY NIGHT...Northwest to north 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. Isolated
showers.
.THURSDAY...North to northeast winds near 10 knots, decreasing to 5
to 10 knots. Seas 1 to 2 feet. Nearshore waters a light chop,
becoming smooth to a light chop. Isolated showers.
.THURSDAY NIGHT...Northeast to east winds 5 to 10 knots. Seas
around 1 foot. Nearshore waters smooth to a light chop. Isolated
showers.

$$

GMZ052>055-072>075-072130-
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-
419 AM EST Sun Dec 7 2025

.TODAY...Southeast to south winds 5 to 10 knots, briefly
increasing to near 10 knots this afternoon. Seas around 1 foot.
Wave Detail: East to southeast 1 foot at 3 seconds. Isolated
showers and thunderstorms.
.TONIGHT...South winds 5 to 10 knots, becoming southwest to west
near 10 knots. Seas around 1 foot, building to 1 to 2 feet. Wave
Detail: Southeast to south 1 foot at 3 seconds. Scattered showers
and isolated thunderstorms.
.MONDAY...Southwest to west winds 10 to 15 knots, increasing to
near 15 knots. Seas 1 to 2 feet, building to 2 to 3 feet. Wave
Detail: Southwest to west 2 feet at 4 seconds. Scattered showers
and isolated thunderstorms.
.MONDAY NIGHT...West to northwest winds near 15 knots, becoming
northwest to north 10 to 15 knots. Seas 2 to 3 feet. Scattered
showers and isolated thunderstorms.
.TUESDAY...Northeast winds 10 to 15 knots. Seas building to 3 to
5 feet, occasionally to 6 feet. Scattered showers and isolated
thunderstorms.
.TUESDAY NIGHT...Northeast winds near 15 knots, decreasing to 10
to 15 knots. Seas 3 to 5 feet, occasionally to 6 feet. Scattered
showers and isolated thunderstorms.
.WEDNESDAY...Northeast to east winds near 10 knots, becoming west
to northwest in the afternoon. Seas 2 to 4 feet, occasionally to
5 feet. Scattered showers and isolated thunderstorms.
.WEDNESDAY NIGHT...Northwest to north winds increasing to 10 to 15
knots. Seas 2 to 3 feet. Isolated showers.
.THURSDAY...North to northeast winds decreasing to near 10 knots.
Seas subsiding to around 2 feet. Isolated showers.
.THURSDAY NIGHT...Northeast to east winds decreasing to 5 to 10
knots. Seas around 2 feet. Isolated showers.

$$

GMZ033-034-072130-
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-
419 AM EST Sun Dec 7 2025

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

$$