662
FZUS52 KKEY 092130
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
430 PM EST Tue Dec 9 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.

GMZ005-100930-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
430 PM EST Tue Dec 9 2025

.SYNOPSIS...Moderate north to northeast breezes are expected this
evening, as a frontal boundary remains draped across the Straits
of Florida. As the front slides eastward and away from the Florida
Keys marine zones overnight, breezes will slacken. A second weak
front will push through the coastal waters late Wednesday and
Wednesday night, with modestly freshened northwesterly breezes
clocking around to the northeast to east for late week and into
the weekend.

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.

$$

GMZ031-100930-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
430 PM EST Tue Dec 9 2025

.TONIGHT...Northeast winds near 15 knots, decreasing to 10 to 15
knots. Bay waters a moderate chop, becoming a light to moderate
chop. Scattered showers, mainly early.
.WEDNESDAY...North to northeast winds 5 to 10 knots, becoming
northwest to north. Bay waters smooth to a light chop. Isolated
showers.
.WEDNESDAY NIGHT...Northwest to north winds 5 to 10 knots. Bay
waters smooth to a light chop. Isolated showers.
.THURSDAY...North winds 5 to 10 knots. Bay waters smooth to a
light chop.
.THURSDAY NIGHT...North to northeast winds 5 to 10 knots,
increasing to near 10 knots. Bay waters smooth to a light chop,
becoming a light chop.
.FRIDAY...Northeast to east winds 10 to 15 knots. Bay waters a
light to moderate chop.
.FRIDAY NIGHT...East winds 10 to 15 knots. Bay waters a light to
moderate chop. Isolated showers.
.SATURDAY...East winds 10 to 15 knots. Bay waters a light to
moderate chop. Scattered showers.
.SATURDAY NIGHT...Northeast to east winds 10 to 15 knots. Bay
waters a light to moderate chop. Scattered showers.
.SUNDAY...Northeast winds 5 to 10 knots, increasing to 10 to
15 knots. Bay waters smooth to a light chop, becoming a light to
moderate chop. Scattered showers.
.SUNDAY NIGHT...Northeast winds 10 to 15 knots, increasing to near
15 knots. Bay waters a light to moderate chop, becoming a moderate
chop. Isolated showers.

$$

GMZ032-035-100930-
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-
430 PM EST Tue Dec 9 2025

.TONIGHT...Northeast winds near 15 knots, decreasing to 10 to 15
knots. Seas 2 to 3 feet, subsiding to around 2 feet. Nearshore
waters a moderate chop, becoming a light to moderate chop.
Scattered showers, mainly early.
.WEDNESDAY...North to northeast winds near 10 knots, becoming
northwest to north and decreasing to 5 to 10 knots. Seas 1 to 2
feet. Nearshore waters a light chop, becoming smooth to a light
chop. Isolated showers.
.WEDNESDAY NIGHT...Northwest to north winds near 10 knots. Seas
1 to 2 feet. Nearshore waters a light chop. Isolated showers.
.THURSDAY...North winds near 10 knots. Seas 1 to 2 feet.
Nearshore waters a light chop.
.THURSDAY NIGHT...North to northeast winds 5 to 10 knots. Seas
around 1 foot. Nearshore waters smooth to a light chop.
.FRIDAY...Northeast to east winds 10 to 15 knots. Seas 1 to
2 feet. Nearshore waters a light to moderate chop.
.FRIDAY NIGHT...East winds 10 to 15 knots. Seas 1 to 2 feet.
Nearshore waters a light to moderate chop. Isolated showers.
.SATURDAY...East winds 10 to 15 knots. Seas 1 to 2 feet.
Nearshore waters a light to moderate chop. Scattered showers.
.SATURDAY NIGHT...Northeast to east winds 10 to 15 knots,
decreasing to near 10 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 light chop. Scattered showers.
.SUNDAY...Northeast winds 5 to 10 knots, increasing to near 10
knots. Seas 1 to 2 feet. Nearshore waters smooth to a light chop,
becoming a light chop. Scattered showers.
.SUNDAY NIGHT...Northeast winds 10 to 15 knots, increasing to near
15 knots. Seas 1 to 2 feet, except building to 2 to 3 feet west of
the Marquesas Keys. Nearshore waters a light to moderate chop,
becoming a moderate chop. Isolated showers.

$$

GMZ042>044-100930-
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-
430 PM EST Tue Dec 9 2025

.TONIGHT...Northeast winds near 15 knots, decreasing to 10 to 15
knots. Seas 2 to 3 feet, subsiding to around 2 feet. West of
Cosgrove Shoal Light, seas 3 to 4 feet, subsiding to 2 to 3 feet.
Nearshore waters a moderate chop, becoming a light to moderate
chop late. Scattered showers, mainly early.
.WEDNESDAY...North to northeast winds near 10 knots, becoming
northwest to north and decreasing to 5 to 10 knots. Seas subsiding
to 1 to 2 feet. 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 winds near 10 knots. Seas 1 to 2 feet.
Nearshore waters a light chop.
.THURSDAY NIGHT...North to northeast winds 5 to 10 knots. Seas
around 1 foot. Nearshore waters smooth to a light chop.
.FRIDAY...Northeast to east winds 10 to 15 knots. Seas 1 to
2 feet. Nearshore waters a light to moderate chop.
.FRIDAY NIGHT...East winds 10 to 15 knots. Seas 1 to 2 feet.
Nearshore waters a light to moderate chop. Isolated showers.
.SATURDAY...East winds 10 to 15 knots. Seas around 2 feet.
Nearshore waters a light to moderate chop. Scattered showers.
.SATURDAY NIGHT...Northeast to east winds near 15 knots. Seas 2
to 3 feet. Nearshore waters a moderate chop. Scattered showers.
.SUNDAY...North to northeast winds near 10 knots. Seas 1 to 2
feet. Nearshore waters a light chop. Scattered showers.
.SUNDAY NIGHT...Northeast winds 10 to 15 knots, increasing to near
15 knots. Seas building to 2 to 3 feet, except building to 3 to 4
feet west of Cosgrove Shoal Light. Nearshore waters a light to
moderate chop, becoming a moderate chop. Isolated showers.

$$

GMZ052>055-072>075-100930-
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-
430 PM EST Tue Dec 9 2025

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

$$

GMZ033-034-100930-
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-
430 PM EST Tue Dec 9 2025

.TONIGHT...Northeast winds near 15 knots, decreasing to near 10
knots. Seas 2 to 4 feet, occasionally to 5 feet, subsiding to 2 to
3 feet. Wave Detail: Northwest to north 3 feet at 7 seconds and
northeast 2 feet at 4 seconds. Isolated showers.
.WEDNESDAY...North to northeast winds near 10 knots, becoming
northwest to north. Seas 2 to 3 feet, subsiding to around 2 feet.
Wave Detail: North 2 feet at 5 seconds. Isolated showers.
.WEDNESDAY NIGHT...Northwest to north winds near 10 knots. Seas
around 2 feet. Wave Detail: Northwest to north 2 feet at 5
seconds. Isolated showers.
.THURSDAY...North winds near 10 knots. Seas 1 to 2 feet.
.THURSDAY NIGHT...North to northeast winds near 10 knots. Seas
1 to 2 feet.
.FRIDAY...Northeast to east winds near 10 knots. Seas 1 to 2
feet. Isolated showers.
.FRIDAY NIGHT AND SATURDAY...Northeast to east winds 10 to 15
knots. Seas around 2 feet. Isolated showers.
.SATURDAY NIGHT...Northeast to east winds near 15 knots. Seas 2
to 3 feet. Isolated showers.
.SUNDAY...Northeast winds 10 to 15 knots. Seas around 2 feet.
Scattered showers.
.SUNDAY NIGHT...North to northeast winds 10 to 15 knots,
increasing to 15 to 20 knots. Seas 2 to 3 feet, building to 2 to
4 feet, occasionally to 5 feet. Isolated showers.

$$

BT/AP