FZUS52 KKEY 202130
CWFKEY
Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
430 PM EST Sat Dec 20 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.
GMZ005-210930-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
430 PM EST Sat Dec 20 2025
.SYNOPSIS...A continental high pressure cell will advance
eastward from the Eastern Seaboard to the western North Atlantic
tonight and Sunday. Cold continental air will reinforce this high
on Sunday and Sunday night, and fresh to strong northeast to east
breezes will develop across all Florida Keys coastal waters by
Sunday night. Fresh to strong northeast to east breezes will peak
and lull through Christmas.
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.
$$
GMZ031-210930-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
430 PM EST Sat Dec 20 2025
.TONIGHT...Northeast winds near 5 knots, becoming northeast to
east and increasing to near 10 knots. Bay waters smooth, becoming a
light chop.
.SUNDAY...Northeast to east winds near 10 knots, increasing to 10
to 15 knots. Bay waters a light chop, becoming a light to
moderate chop.
.SUNDAY NIGHT...Northeast winds near 15 knots, increasing to 15 to
20 knots. Bay waters a moderate chop, becoming choppy.
.MONDAY...Northeast winds near 20 knots. Bay waters rough.
.MONDAY NIGHT...Northeast to east winds near 20 knots. Bay waters
rough.
.TUESDAY...Northeast to east winds 15 to 20 knots. Bay waters
choppy.
.TUESDAY NIGHT THROUGH THURSDAY...Northeast to east winds 15 to
20 knots. Bay waters choppy.
.THURSDAY NIGHT...Northeast to east winds near 15 knots. Bay
waters a moderate chop.
$$
GMZ032-035-210930-
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 Sat Dec 20 2025
.TONIGHT...North to northeast winds near 5 knots, becoming
northeast to east near 10 knots. Seas around 1 foot, building to 1
to 2 feet. Nearshore waters smooth, becoming a light chop.
.SUNDAY...Northeast to east winds near 10 knots. Seas 1 to 2
feet. Nearshore waters a light chop.
.SUNDAY NIGHT...Northeast winds 10 to 15 knots, increasing to 15
to 20 knots. Seas 1 to 2 feet, building to 2 to 3 feet. Nearshore
waters a light to moderate chop, becoming choppy.
.MONDAY...Northeast winds 15 to 20 knots. Seas 2 to 3 feet, except
3 to 4 feet west of the Marquesas Keys. Nearshore waters choppy.
.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.
.TUESDAY...Northeast to east winds 15 to 20 knots. Seas 2 to
3 feet, except 4 to 5 feet, occasionally to 6 feet west of the
Marquesas Keys. Nearshore waters choppy.
.TUESDAY 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.
.WEDNESDAY THROUGH THURSDAY...Northeast to east winds 15 to 20
knots. Seas 2 to 3 feet, except around 4 feet, occasionally to 5
feet west of the Marquesas Keys. Nearshore waters choppy.
.THURSDAY NIGHT...Northeast to east winds near 15 knots. Seas 1
to 3 feet, except 3 to 4 feet west of the Marquesas Keys.
Nearshore waters a moderate chop.
$$
GMZ042>044-210930-
Hawk Channel from Ocean Reef to Craig Key out to the reef-
Hawk Channel from Craig Key to west end of Seven Mile Bridge out
to the reef-
Hawk Channel from west end of Seven Mile Bridge to Halfmoon Shoal
out to the reef-
430 PM EST Sat Dec 20 2025
.TONIGHT...Northeast to east winds near 10 knots. Seas 1 to 2
feet. Nearshore waters a light chop.
.SUNDAY...Northeast to east winds 10 to 15 knots. Seas 1 to
3 feet. Nearshore waters a light to moderate chop.
.SUNDAY NIGHT...Northeast winds 15 to 20 knots. Seas 2 to 4 feet.
Nearshore waters choppy.
.MONDAY...Northeast winds near 20 knots, increasing to 20 to 25
knots. Seas 2 to 4 feet, occasionally to 5 feet. Nearshore waters
rough, becoming very rough.
.MONDAY NIGHT...Northeast to east winds 20 to 25 knots. Seas 3 to
5 feet, occasionally to 6 feet. Nearshore waters very rough.
.TUESDAY...Northeast to east winds near 20 knots. Seas 3 to 5
feet, occasionally to 6 feet. Nearshore waters rough.
.TUESDAY NIGHT...Northeast to east winds near 20 knots. Seas 3 to
5 feet, occasionally to 6 feet. Nearshore waters rough.
.WEDNESDAY THROUGH THURSDAY...Northeast to east winds near 20
knots. Seas 3 to 4 feet, occasionally to 5 feet. Nearshore waters
rough.
.THURSDAY NIGHT...Northeast to east winds 15 to 20 knots. Seas
2 to 4 feet. Nearshore waters choppy.
$$
GMZ052>055-072>075-210930-
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 Sat Dec 20 2025
...SMALL CRAFT ADVISORY MAY BE REQUIRED SUNDAY NIGHT...
.TONIGHT...Northeast to east winds 10 to 15 knots. Seas 2 to
3 feet. Wave Detail: Northeast to east 3 feet at 4 seconds and
northwest 2 feet at 6 seconds.
.SUNDAY...Northeast to east winds near 15 knots, increasing to
15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave
Detail: Northeast to east 4 feet at 5 seconds and northwest 1
foot at 6 seconds. Isolated showers.
.SUNDAY NIGHT...Northeast winds 15 to 20 knots, increasing to near
20 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail:
Northeast to east 6 feet at 6 seconds and northwest 1 foot at 5
seconds. Isolated showers.
.MONDAY...Northeast winds 20 to 25 knots. Seas 5 to 8 feet,
occasionally to 10 feet. Isolated showers.
.MONDAY NIGHT AND TUESDAY...Northeast to east winds 20 to 25
knots. Seas 7 to 9 feet, occasionally to 11 feet. Isolated
showers.
.TUESDAY NIGHT...Northeast to east winds 20 to 25 knots. Seas
6 to 9 feet, occasionally to 11 feet. Isolated showers.
.WEDNESDAY AND WEDNESDAY NIGHT...Northeast to east winds 20 to 25
knots. Seas 6 to 8 feet, occasionally to 10 feet.
.THURSDAY...Northeast to east winds near 20 knots. Seas 5 to 8
feet, occasionally to 9 feet.
.THURSDAY NIGHT...Northeast to east winds 15 to 20 knots. Seas
4 to 7 feet, occasionally to 8 feet.
$$
GMZ033-034-210930-
Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM
out and beyond 5 fathoms-
Gulf of America including Dry Tortugas and Rebecca Shoal Channel-
430 PM EST Sat Dec 20 2025
.TONIGHT...Northeast winds 5 to 10 knots, increasing to near 10
knots. Seas 2 to 3 feet composed of northwest swell. Wave Detail:
Northwest 2 feet at 6 seconds.
.SUNDAY...Northeast winds 10 to 15 knots, decreasing to near 10
knots in the afternoon. Seas 1 to 3 feet composed of northwest
swell. Wave Detail: Northwest 2 feet at 6 seconds and northeast
to east 1 foot at 3 seconds.
.SUNDAY NIGHT...Northeast winds 10 to 15 knots, increasing to 15
to 20 knots late. Seas 2 to 3 feet, building to 3 to 4 feet. Wave
Detail: Northeast 2 feet at 3 seconds and northwest 1 foot at 5
seconds.
.MONDAY...Northeast winds near 20 knots, briefly decreasing to 15
to 20 knots in the afternoon. Seas 3 to 4 feet, occasionally to 5
feet.
.MONDAY NIGHT...Northeast to east winds near 20 knots. Seas 3 to
5 feet, occasionally to 6 feet.
.TUESDAY...Northeast to east winds 15 to 20 knots. Seas 3 to
5 feet, occasionally to 6 feet.
.TUESDAY NIGHT...Northeast to east winds near 20 knots. Seas 3 to
5 feet, occasionally to 6 feet.
.WEDNESDAY...Northeast winds 15 to 20 knots. Seas 3 to 5 feet,
occasionally to 6 feet.
.WEDNESDAY NIGHT...Northeast to east winds near 20 knots. Seas 3
to 5 feet, occasionally to 6 feet.
.THURSDAY...Northeast to east winds 15 to 20 knots. Seas 3 to
5 feet, occasionally to 6 feet.
.THURSDAY NIGHT...Northeast to east winds near 15 knots. Seas 2
to 4 feet.
$$
CLR
CWFKEY
Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
430 PM EST Sat Dec 20 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.
GMZ005-210930-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
430 PM EST Sat Dec 20 2025
.SYNOPSIS...A continental high pressure cell will advance
eastward from the Eastern Seaboard to the western North Atlantic
tonight and Sunday. Cold continental air will reinforce this high
on Sunday and Sunday night, and fresh to strong northeast to east
breezes will develop across all Florida Keys coastal waters by
Sunday night. Fresh to strong northeast to east breezes will peak
and lull through Christmas.
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.
$$
GMZ031-210930-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
430 PM EST Sat Dec 20 2025
.TONIGHT...Northeast winds near 5 knots, becoming northeast to
east and increasing to near 10 knots. Bay waters smooth, becoming a
light chop.
.SUNDAY...Northeast to east winds near 10 knots, increasing to 10
to 15 knots. Bay waters a light chop, becoming a light to
moderate chop.
.SUNDAY NIGHT...Northeast winds near 15 knots, increasing to 15 to
20 knots. Bay waters a moderate chop, becoming choppy.
.MONDAY...Northeast winds near 20 knots. Bay waters rough.
.MONDAY NIGHT...Northeast to east winds near 20 knots. Bay waters
rough.
.TUESDAY...Northeast to east winds 15 to 20 knots. Bay waters
choppy.
.TUESDAY NIGHT THROUGH THURSDAY...Northeast to east winds 15 to
20 knots. Bay waters choppy.
.THURSDAY NIGHT...Northeast to east winds near 15 knots. Bay
waters a moderate chop.
$$
GMZ032-035-210930-
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 Sat Dec 20 2025
.TONIGHT...North to northeast winds near 5 knots, becoming
northeast to east near 10 knots. Seas around 1 foot, building to 1
to 2 feet. Nearshore waters smooth, becoming a light chop.
.SUNDAY...Northeast to east winds near 10 knots. Seas 1 to 2
feet. Nearshore waters a light chop.
.SUNDAY NIGHT...Northeast winds 10 to 15 knots, increasing to 15
to 20 knots. Seas 1 to 2 feet, building to 2 to 3 feet. Nearshore
waters a light to moderate chop, becoming choppy.
.MONDAY...Northeast winds 15 to 20 knots. Seas 2 to 3 feet, except
3 to 4 feet west of the Marquesas Keys. Nearshore waters choppy.
.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.
.TUESDAY...Northeast to east winds 15 to 20 knots. Seas 2 to
3 feet, except 4 to 5 feet, occasionally to 6 feet west of the
Marquesas Keys. Nearshore waters choppy.
.TUESDAY 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.
.WEDNESDAY THROUGH THURSDAY...Northeast to east winds 15 to 20
knots. Seas 2 to 3 feet, except around 4 feet, occasionally to 5
feet west of the Marquesas Keys. Nearshore waters choppy.
.THURSDAY NIGHT...Northeast to east winds near 15 knots. Seas 1
to 3 feet, except 3 to 4 feet west of the Marquesas Keys.
Nearshore waters a moderate chop.
$$
GMZ042>044-210930-
Hawk Channel from Ocean Reef to Craig Key out to the reef-
Hawk Channel from Craig Key to west end of Seven Mile Bridge out
to the reef-
Hawk Channel from west end of Seven Mile Bridge to Halfmoon Shoal
out to the reef-
430 PM EST Sat Dec 20 2025
.TONIGHT...Northeast to east winds near 10 knots. Seas 1 to 2
feet. Nearshore waters a light chop.
.SUNDAY...Northeast to east winds 10 to 15 knots. Seas 1 to
3 feet. Nearshore waters a light to moderate chop.
.SUNDAY NIGHT...Northeast winds 15 to 20 knots. Seas 2 to 4 feet.
Nearshore waters choppy.
.MONDAY...Northeast winds near 20 knots, increasing to 20 to 25
knots. Seas 2 to 4 feet, occasionally to 5 feet. Nearshore waters
rough, becoming very rough.
.MONDAY NIGHT...Northeast to east winds 20 to 25 knots. Seas 3 to
5 feet, occasionally to 6 feet. Nearshore waters very rough.
.TUESDAY...Northeast to east winds near 20 knots. Seas 3 to 5
feet, occasionally to 6 feet. Nearshore waters rough.
.TUESDAY NIGHT...Northeast to east winds near 20 knots. Seas 3 to
5 feet, occasionally to 6 feet. Nearshore waters rough.
.WEDNESDAY THROUGH THURSDAY...Northeast to east winds near 20
knots. Seas 3 to 4 feet, occasionally to 5 feet. Nearshore waters
rough.
.THURSDAY NIGHT...Northeast to east winds 15 to 20 knots. Seas
2 to 4 feet. Nearshore waters choppy.
$$
GMZ052>055-072>075-210930-
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 Sat Dec 20 2025
...SMALL CRAFT ADVISORY MAY BE REQUIRED SUNDAY NIGHT...
.TONIGHT...Northeast to east winds 10 to 15 knots. Seas 2 to
3 feet. Wave Detail: Northeast to east 3 feet at 4 seconds and
northwest 2 feet at 6 seconds.
.SUNDAY...Northeast to east winds near 15 knots, increasing to
15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave
Detail: Northeast to east 4 feet at 5 seconds and northwest 1
foot at 6 seconds. Isolated showers.
.SUNDAY NIGHT...Northeast winds 15 to 20 knots, increasing to near
20 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail:
Northeast to east 6 feet at 6 seconds and northwest 1 foot at 5
seconds. Isolated showers.
.MONDAY...Northeast winds 20 to 25 knots. Seas 5 to 8 feet,
occasionally to 10 feet. Isolated showers.
.MONDAY NIGHT AND TUESDAY...Northeast to east winds 20 to 25
knots. Seas 7 to 9 feet, occasionally to 11 feet. Isolated
showers.
.TUESDAY NIGHT...Northeast to east winds 20 to 25 knots. Seas
6 to 9 feet, occasionally to 11 feet. Isolated showers.
.WEDNESDAY AND WEDNESDAY NIGHT...Northeast to east winds 20 to 25
knots. Seas 6 to 8 feet, occasionally to 10 feet.
.THURSDAY...Northeast to east winds near 20 knots. Seas 5 to 8
feet, occasionally to 9 feet.
.THURSDAY NIGHT...Northeast to east winds 15 to 20 knots. Seas
4 to 7 feet, occasionally to 8 feet.
$$
GMZ033-034-210930-
Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM
out and beyond 5 fathoms-
Gulf of America including Dry Tortugas and Rebecca Shoal Channel-
430 PM EST Sat Dec 20 2025
.TONIGHT...Northeast winds 5 to 10 knots, increasing to near 10
knots. Seas 2 to 3 feet composed of northwest swell. Wave Detail:
Northwest 2 feet at 6 seconds.
.SUNDAY...Northeast winds 10 to 15 knots, decreasing to near 10
knots in the afternoon. Seas 1 to 3 feet composed of northwest
swell. Wave Detail: Northwest 2 feet at 6 seconds and northeast
to east 1 foot at 3 seconds.
.SUNDAY NIGHT...Northeast winds 10 to 15 knots, increasing to 15
to 20 knots late. Seas 2 to 3 feet, building to 3 to 4 feet. Wave
Detail: Northeast 2 feet at 3 seconds and northwest 1 foot at 5
seconds.
.MONDAY...Northeast winds near 20 knots, briefly decreasing to 15
to 20 knots in the afternoon. Seas 3 to 4 feet, occasionally to 5
feet.
.MONDAY NIGHT...Northeast to east winds near 20 knots. Seas 3 to
5 feet, occasionally to 6 feet.
.TUESDAY...Northeast to east winds 15 to 20 knots. Seas 3 to
5 feet, occasionally to 6 feet.
.TUESDAY NIGHT...Northeast to east winds near 20 knots. Seas 3 to
5 feet, occasionally to 6 feet.
.WEDNESDAY...Northeast winds 15 to 20 knots. Seas 3 to 5 feet,
occasionally to 6 feet.
.WEDNESDAY NIGHT...Northeast to east winds near 20 knots. Seas 3
to 5 feet, occasionally to 6 feet.
.THURSDAY...Northeast to east winds 15 to 20 knots. Seas 3 to
5 feet, occasionally to 6 feet.
.THURSDAY NIGHT...Northeast to east winds near 15 knots. Seas 2
to 4 feet.
$$
CLR