FZUS52 KKEY 181510
CWFKEY
Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
1010 AM EST Thu Dec 18 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.
GMZ005-190315-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1010 AM EST Thu Dec 18 2025
.SYNOPSIS...Gentle to moderate east to southeast breezes will
slacken this afternoon as high pressure slides further eastward
off the Eastern Seaboard into the central North Atlantic. A weak
front will push through the Florida Keys coastal waters by the end
of the week, with modestly freshened breezes expected for the
weekend in its wake. Another high building over the Eastern
Seaboard will support fresh to strong breezes for early next week.
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.
$$
GMZ031-190315-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
1010 AM EST Thu Dec 18 2025
.THIS AFTERNOON...Southeast winds 10 to 15 knots early,
decreasing to 5 to 10 knots. Bay waters a light to moderate chop,
becoming smooth to a light chop. Isolated showers.
.TONIGHT...Southeast winds 5 to 10 knots, becoming south to
southwest. Bay waters smooth to a light chop. Scattered showers
and isolated thunderstorms.
.FRIDAY...Southwest to west winds 5 to 10 knots, becoming west to
northwest. Bay waters smooth to a light chop. Isolated showers.
.FRIDAY NIGHT...Northwest winds 5 to 10 knots, becoming north
near 10 knots. Bay waters smooth to a light chop, becoming a light
chop.
.SATURDAY...Northeast to east winds near 10 knots. Bay waters a
light chop.
.SATURDAY NIGHT...Northeast to east winds near 10 knots. Bay
waters a light chop.
.SUNDAY...Northeast to east winds near 10 knots. Bay waters a
light chop. Isolated showers.
.SUNDAY NIGHT...Northeast winds 10 to 15 knots, increasing to near
15 knots. Bay waters a light to moderate chop, becoming a moderate
chop. Isolated showers.
.MONDAY...Northeast winds increasing to near 20 knots. Bay waters
becoming rough. Isolated showers.
.MONDAY NIGHT...Northeast to east winds near 20 knots. Bay waters
rough. Isolated showers.
$$
GMZ032-035-190315-
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-
1010 AM EST Thu Dec 18 2025
.THIS AFTERNOON...Southeast winds near 10 knots. Seas around 1
foot. Nearshore waters a light chop. Isolated showers.
.TONIGHT...Southeast winds 5 to 10 knots, becoming south to
southwest. Seas 1 foot or less. Nearshore waters smooth to a
light chop. Scattered showers and isolated thunderstorms.
.FRIDAY...Southwest to west winds 5 to 10 knots, becoming
northwest near 10 knots. Seas around 1 foot. Nearshore waters
smooth to a light chop, becoming a light chop. Isolated showers.
.FRIDAY NIGHT...Northwest to north winds near 10 knots, becoming
north 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a light
chop, becoming a light to moderate chop.
.SATURDAY...North to northeast winds near 10 knots, becoming
northeast to east 5 to 10 knots. Seas 1 to 2 feet. Nearshore
waters a light chop, becoming smooth to a light chop.
.SATURDAY NIGHT...Northeast to east winds near 10 knots. Seas 1
to 2 feet. Nearshore waters a light chop.
.SUNDAY...Northeast winds near 10 knots. Seas 1 to 2 feet.
Nearshore waters a light chop. Isolated showers.
.SUNDAY NIGHT...Northeast winds 10 to 15 knots, increasing to near
15 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate
chop, becoming a moderate chop. Isolated showers.
.MONDAY...Northeast to east winds 15 to 20 knots, increasing to
near 20 knots. Seas 2 to 3 feet, except 3 to 4 feet, occasionally
to 5 feet west of the Marquesas Keys. Nearshore waters choppy,
becoming rough. Isolated showers.
.MONDAY NIGHT...Northeast to east winds near 20 knots. Seas 2 to
3 feet, except 4 to 5 feet, occasionally to 6 feet west of the
Marquesas Keys. Nearshore waters rough. Isolated showers.
$$
GMZ042>044-190315-
Hawk Channel from Ocean Reef to Craig Key out to the reef-
Hawk Channel from Craig Key to west end of Seven Mile Bridge out
to the reef-
Hawk Channel from west end of Seven Mile Bridge to Halfmoon Shoal
out to the reef-
1010 AM EST Thu Dec 18 2025
.THIS AFTERNOON...Southeast winds near 15 knots early, decreasing
to near 10 knots. Seas 2 to 3 feet. Nearshore waters a moderate
chop, becoming a light chop. Isolated showers.
.TONIGHT...Southeast winds near 10 knots, becoming south to
southwest 5 to 10 knots. Seas 1 to 2 feet. Nearshore waters a
light chop, becoming smooth to a light chop. Scattered showers and
isolated thunderstorms.
.FRIDAY...West to northwest winds 5 to 10 knots, increasing to
near 10 knots. Seas around 1 foot. Nearshore waters smooth to a
light chop, becoming a light chop. Isolated showers.
.FRIDAY NIGHT...Northwest to north winds near 10 knots,
becoming north 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a
light chop, becoming a light to moderate chop.
.SATURDAY...Northeast winds near 10 knots, becoming northeast to
east. Seas 1 to 2 feet. Nearshore waters a light chop.
.SATURDAY NIGHT...Northeast to east winds near 10 knots. Seas
1 to 2 feet. Nearshore waters a light chop. Isolated showers.
.SUNDAY...Northeast winds 10 to 15 knots. Seas 1 to 2 feet.
Nearshore waters a light to moderate chop. Isolated showers.
.SUNDAY NIGHT...Northeast winds near 15 knots, increasing to 15
to 20 knots after midnight. Seas building to 2 to 3 feet.
Nearshore waters a moderate chop, becoming choppy. Isolated
showers.
.MONDAY...Northeast to east winds 15 to 20 knots, increasing to
near 20 knots. Seas 2 to 4 feet, occasionally to 5 feet.
Nearshore waters choppy, becoming rough. Isolated showers.
.MONDAY NIGHT...Northeast to east winds 20 to 25 knots. Seas 3 to
5 feet, occasionally to 6 feet. Nearshore waters very rough.
Isolated showers.
$$
GMZ052>055-072>075-190315-
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-
1010 AM EST Thu Dec 18 2025
.THIS AFTERNOON...Southeast winds near 15 knots, decreasing to 10
to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave
Detail: East to southeast 4 feet at 6 seconds. Isolated showers.
.TONIGHT...Southeast winds near 10 knots, becoming south to
southwest 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: East to
southeast 3 feet at 5 seconds. Scattered showers and isolated
thunderstorms.
.FRIDAY...Southwest to west winds near 10 knots, becoming
northwest 5 to 10 knots. Seas 1 to 2 feet. Wave Detail: Northeast
to east 2 feet at 5 seconds. Isolated showers.
.FRIDAY NIGHT...North winds near 10 knots. Seas 1 to 2 feet.
Isolated showers.
.SATURDAY...Northeast winds 10 to 15 knots. Seas 1 to 2 feet,
building to 1 to 3 feet. Isolated showers.
.SATURDAY NIGHT...Northeast to east winds near 10 knots. Seas
2 to 3 feet. Isolated showers.
.SUNDAY...Northeast to east winds 10 to 15 knots, increasing to
near 15 knots. Seas 2 to 3 feet. Isolated showers.
.SUNDAY NIGHT...Northeast winds 15 to 20 knots. Seas 3 to 5 feet,
occasionally to 6 feet. Isolated showers.
.MONDAY...Northeast to east winds near 20 knots, increasing to 20
to 25 knots. Seas 5 to 7 feet, occasionally to 9 feet. Isolated
showers.
.MONDAY NIGHT...Northeast to east winds 20 to 25 knots. Seas 7 to
9 feet, occasionally to 11 feet. Isolated showers.
$$
GMZ033-034-190315-
Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM
out and beyond 5 fathoms-
Gulf of America including Dry Tortugas and Rebecca Shoal Channel-
1010 AM EST Thu Dec 18 2025
.THIS AFTERNOON...Southeast winds 10 to 15 knots, decreasing to
near 10 knots. Seas 2 to 3 feet. Wave Detail: East to southeast 3
feet at 4 seconds. Isolated showers.
.TONIGHT...Southeast to south winds 5 to 10 knots, becoming south
to southwest. Seas 1 to 2 feet. Wave Detail: Southeast to south 2
feet at 4 seconds. Scattered showers and isolated thunderstorms.
.FRIDAY...West to northwest winds 5 to 10 knots. Seas around 1
foot. Wave Detail: West to northwest 1 foot at 3 seconds.
Isolated showers.
.FRIDAY NIGHT...North winds 10 to 15 knots. Seas 1 to 2 feet.
.SATURDAY...Northeast winds 10 to 15 knots, becoming northeast to
east near 10 knots. Seas building to 2 to 3 feet.
.SATURDAY NIGHT...Northeast to east winds near 10 knots. Seas
around 2 feet. Isolated showers.
.SUNDAY...Northeast winds 10 to 15 knots. Seas 1 to 2 feet.
Isolated showers.
.SUNDAY NIGHT...Northeast winds 10 to 15 knots, increasing to near
15 knots. Seas around 2 feet.
.MONDAY...Northeast winds 15 to 20 knots. Seas building to 2 to 4
feet, occasionally to 5 feet. Isolated showers.
.MONDAY NIGHT...Northeast to east winds increasing to near 20
knots. Seas 3 to 5 feet, occasionally to 6 feet. Isolated showers.
$$
CWFKEY
Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
1010 AM EST Thu Dec 18 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.
GMZ005-190315-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1010 AM EST Thu Dec 18 2025
.SYNOPSIS...Gentle to moderate east to southeast breezes will
slacken this afternoon as high pressure slides further eastward
off the Eastern Seaboard into the central North Atlantic. A weak
front will push through the Florida Keys coastal waters by the end
of the week, with modestly freshened breezes expected for the
weekend in its wake. Another high building over the Eastern
Seaboard will support fresh to strong breezes for early next week.
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.
$$
GMZ031-190315-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
1010 AM EST Thu Dec 18 2025
.THIS AFTERNOON...Southeast winds 10 to 15 knots early,
decreasing to 5 to 10 knots. Bay waters a light to moderate chop,
becoming smooth to a light chop. Isolated showers.
.TONIGHT...Southeast winds 5 to 10 knots, becoming south to
southwest. Bay waters smooth to a light chop. Scattered showers
and isolated thunderstorms.
.FRIDAY...Southwest to west winds 5 to 10 knots, becoming west to
northwest. Bay waters smooth to a light chop. Isolated showers.
.FRIDAY NIGHT...Northwest winds 5 to 10 knots, becoming north
near 10 knots. Bay waters smooth to a light chop, becoming a light
chop.
.SATURDAY...Northeast to east winds near 10 knots. Bay waters a
light chop.
.SATURDAY NIGHT...Northeast to east winds near 10 knots. Bay
waters a light chop.
.SUNDAY...Northeast to east winds near 10 knots. Bay waters a
light chop. Isolated showers.
.SUNDAY NIGHT...Northeast winds 10 to 15 knots, increasing to near
15 knots. Bay waters a light to moderate chop, becoming a moderate
chop. Isolated showers.
.MONDAY...Northeast winds increasing to near 20 knots. Bay waters
becoming rough. Isolated showers.
.MONDAY NIGHT...Northeast to east winds near 20 knots. Bay waters
rough. Isolated showers.
$$
GMZ032-035-190315-
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-
1010 AM EST Thu Dec 18 2025
.THIS AFTERNOON...Southeast winds near 10 knots. Seas around 1
foot. Nearshore waters a light chop. Isolated showers.
.TONIGHT...Southeast winds 5 to 10 knots, becoming south to
southwest. Seas 1 foot or less. Nearshore waters smooth to a
light chop. Scattered showers and isolated thunderstorms.
.FRIDAY...Southwest to west winds 5 to 10 knots, becoming
northwest near 10 knots. Seas around 1 foot. Nearshore waters
smooth to a light chop, becoming a light chop. Isolated showers.
.FRIDAY NIGHT...Northwest to north winds near 10 knots, becoming
north 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a light
chop, becoming a light to moderate chop.
.SATURDAY...North to northeast winds near 10 knots, becoming
northeast to east 5 to 10 knots. Seas 1 to 2 feet. Nearshore
waters a light chop, becoming smooth to a light chop.
.SATURDAY NIGHT...Northeast to east winds near 10 knots. Seas 1
to 2 feet. Nearshore waters a light chop.
.SUNDAY...Northeast winds near 10 knots. Seas 1 to 2 feet.
Nearshore waters a light chop. Isolated showers.
.SUNDAY NIGHT...Northeast winds 10 to 15 knots, increasing to near
15 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate
chop, becoming a moderate chop. Isolated showers.
.MONDAY...Northeast to east winds 15 to 20 knots, increasing to
near 20 knots. Seas 2 to 3 feet, except 3 to 4 feet, occasionally
to 5 feet west of the Marquesas Keys. Nearshore waters choppy,
becoming rough. Isolated showers.
.MONDAY NIGHT...Northeast to east winds near 20 knots. Seas 2 to
3 feet, except 4 to 5 feet, occasionally to 6 feet west of the
Marquesas Keys. Nearshore waters rough. Isolated showers.
$$
GMZ042>044-190315-
Hawk Channel from Ocean Reef to Craig Key out to the reef-
Hawk Channel from Craig Key to west end of Seven Mile Bridge out
to the reef-
Hawk Channel from west end of Seven Mile Bridge to Halfmoon Shoal
out to the reef-
1010 AM EST Thu Dec 18 2025
.THIS AFTERNOON...Southeast winds near 15 knots early, decreasing
to near 10 knots. Seas 2 to 3 feet. Nearshore waters a moderate
chop, becoming a light chop. Isolated showers.
.TONIGHT...Southeast winds near 10 knots, becoming south to
southwest 5 to 10 knots. Seas 1 to 2 feet. Nearshore waters a
light chop, becoming smooth to a light chop. Scattered showers and
isolated thunderstorms.
.FRIDAY...West to northwest winds 5 to 10 knots, increasing to
near 10 knots. Seas around 1 foot. Nearshore waters smooth to a
light chop, becoming a light chop. Isolated showers.
.FRIDAY NIGHT...Northwest to north winds near 10 knots,
becoming north 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a
light chop, becoming a light to moderate chop.
.SATURDAY...Northeast winds near 10 knots, becoming northeast to
east. Seas 1 to 2 feet. Nearshore waters a light chop.
.SATURDAY NIGHT...Northeast to east winds near 10 knots. Seas
1 to 2 feet. Nearshore waters a light chop. Isolated showers.
.SUNDAY...Northeast winds 10 to 15 knots. Seas 1 to 2 feet.
Nearshore waters a light to moderate chop. Isolated showers.
.SUNDAY NIGHT...Northeast winds near 15 knots, increasing to 15
to 20 knots after midnight. Seas building to 2 to 3 feet.
Nearshore waters a moderate chop, becoming choppy. Isolated
showers.
.MONDAY...Northeast to east winds 15 to 20 knots, increasing to
near 20 knots. Seas 2 to 4 feet, occasionally to 5 feet.
Nearshore waters choppy, becoming rough. Isolated showers.
.MONDAY NIGHT...Northeast to east winds 20 to 25 knots. Seas 3 to
5 feet, occasionally to 6 feet. Nearshore waters very rough.
Isolated showers.
$$
GMZ052>055-072>075-190315-
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-
1010 AM EST Thu Dec 18 2025
.THIS AFTERNOON...Southeast winds near 15 knots, decreasing to 10
to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave
Detail: East to southeast 4 feet at 6 seconds. Isolated showers.
.TONIGHT...Southeast winds near 10 knots, becoming south to
southwest 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: East to
southeast 3 feet at 5 seconds. Scattered showers and isolated
thunderstorms.
.FRIDAY...Southwest to west winds near 10 knots, becoming
northwest 5 to 10 knots. Seas 1 to 2 feet. Wave Detail: Northeast
to east 2 feet at 5 seconds. Isolated showers.
.FRIDAY NIGHT...North winds near 10 knots. Seas 1 to 2 feet.
Isolated showers.
.SATURDAY...Northeast winds 10 to 15 knots. Seas 1 to 2 feet,
building to 1 to 3 feet. Isolated showers.
.SATURDAY NIGHT...Northeast to east winds near 10 knots. Seas
2 to 3 feet. Isolated showers.
.SUNDAY...Northeast to east winds 10 to 15 knots, increasing to
near 15 knots. Seas 2 to 3 feet. Isolated showers.
.SUNDAY NIGHT...Northeast winds 15 to 20 knots. Seas 3 to 5 feet,
occasionally to 6 feet. Isolated showers.
.MONDAY...Northeast to east winds near 20 knots, increasing to 20
to 25 knots. Seas 5 to 7 feet, occasionally to 9 feet. Isolated
showers.
.MONDAY NIGHT...Northeast to east winds 20 to 25 knots. Seas 7 to
9 feet, occasionally to 11 feet. Isolated showers.
$$
GMZ033-034-190315-
Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM
out and beyond 5 fathoms-
Gulf of America including Dry Tortugas and Rebecca Shoal Channel-
1010 AM EST Thu Dec 18 2025
.THIS AFTERNOON...Southeast winds 10 to 15 knots, decreasing to
near 10 knots. Seas 2 to 3 feet. Wave Detail: East to southeast 3
feet at 4 seconds. Isolated showers.
.TONIGHT...Southeast to south winds 5 to 10 knots, becoming south
to southwest. Seas 1 to 2 feet. Wave Detail: Southeast to south 2
feet at 4 seconds. Scattered showers and isolated thunderstorms.
.FRIDAY...West to northwest winds 5 to 10 knots. Seas around 1
foot. Wave Detail: West to northwest 1 foot at 3 seconds.
Isolated showers.
.FRIDAY NIGHT...North winds 10 to 15 knots. Seas 1 to 2 feet.
.SATURDAY...Northeast winds 10 to 15 knots, becoming northeast to
east near 10 knots. Seas building to 2 to 3 feet.
.SATURDAY NIGHT...Northeast to east winds near 10 knots. Seas
around 2 feet. Isolated showers.
.SUNDAY...Northeast winds 10 to 15 knots. Seas 1 to 2 feet.
Isolated showers.
.SUNDAY NIGHT...Northeast winds 10 to 15 knots, increasing to near
15 knots. Seas around 2 feet.
.MONDAY...Northeast winds 15 to 20 knots. Seas building to 2 to 4
feet, occasionally to 5 feet. Isolated showers.
.MONDAY NIGHT...Northeast to east winds increasing to near 20
knots. Seas 3 to 5 feet, occasionally to 6 feet. Isolated showers.
$$