FZUS52 KKEY 200928
CWFKEY
Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
428 AM 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.
GMZ005-202130-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
428 AM EST Sat Dec 20 2025
.SYNOPSIS...A very weak cold front over the southern Florida
Peninsula and southern Gulf will move southward today, becoming
stationary over the Straits of Florida. A brief surge of moderate
to fresh northerly breezes will follow the front, peaking early
this morning. A continental high pressure cell will advance
eastward from the southeastern United States to the western North
Atlantic this weekend. The high will be reinforced by cold
continental air Sunday and Sunday night, and fresh to strong
northeast to east breezes are expected to develop across all
Florida Keys coastal waters Sunday night, persisting through at
least Christmas Eve.
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.
$$
GMZ031-202130-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
428 AM EST Sat Dec 20 2025
.TODAY...Northeast winds near 15 knots, becoming east and
decreasing to 5 to 10 knots. Bay waters a moderate chop, becoming
smooth to a light chop.
.TONIGHT...Northeast to east winds 5 to 10 knots. Bay waters
smooth to a light chop.
.SUNDAY...Northeast to east winds near 10 knots, increasing to 10
to 15 knots. Bay waters a light chop, becoming a light to
moderate chop.
.SUNDAY NIGHT...Northeast winds near 15 knots. Bay waters a
moderate chop.
.MONDAY...Northeast to east winds 15 to 20 knots, increasing to
near 20 knots. Bay waters choppy, becoming rough.
.MONDAY NIGHT...Northeast to east winds near 20 knots, decreasing
to 15 to 20 knots. Bay waters rough, becoming choppy.
.TUESDAY THROUGH WEDNESDAY NIGHT...Northeast to east winds 15 to
20 knots. Bay waters choppy.
$$
GMZ032-035-202130-
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 AM EST Sat Dec 20 2025
.TODAY...North to northeast winds near 15 knots, becoming
northeast to east and decreasing to 5 to 10 knots. Seas 1 to 2
feet, except around 2 feet west of the Marquesas Keys. Nearshore
waters a moderate chop, becoming smooth to a light chop.
.TONIGHT...Northeast to east winds near 10 knots. Seas 1 to
2 feet, except around 2 feet west of the Marquesas Keys.
Nearshore waters a light chop.
.SUNDAY...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.
.SUNDAY NIGHT...Northeast to east winds 10 to 15 knots, increasing
to 15 to 20 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 choppy.
.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.
.MONDAY NIGHT...Northeast to east winds near 20 knots, decreasing
to 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 rough, becoming choppy.
.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 AND WEDNESDAY...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.
.WEDNESDAY NIGHT...Northeast to east winds 15 to 20 knots. Seas
2 to 3 feet, except 3 to 4 feet, occasionally to 5 feet west of
the Marquesas Keys. Nearshore waters choppy.
$$
GMZ042>044-202130-
Hawk Channel from Ocean Reef to Craig Key out to the reef-
Hawk Channel from Craig Key to west end of Seven Mile Bridge out
to the reef-
Hawk Channel from west end of Seven Mile Bridge to Halfmoon Shoal
out to the reef-
428 AM EST Sat Dec 20 2025
.TODAY...Northeast winds near 15 knots, becoming northeast to
east and decreasing to near 10 knots. Seas 1 to 2 feet, except
around 2 feet west of Cosgrove Shoal Light. Nearshore waters a
moderate chop, becoming a light chop.
.TONIGHT...Northeast to east winds near 10 knots. Seas 1 to
2 feet. Nearshore waters a light chop.
.SUNDAY...Northeast to east winds 10 to 15 knots. Seas around 2 feet.
Nearshore waters a light to moderate chop.
.SUNDAY NIGHT...Northeast winds near 15 knots, increasing to 15
to 20 knots. Seas 2 to 3 feet. Nearshore waters a moderate chop,
becoming choppy.
.MONDAY...Northeast to east winds near 20 knots, increasing to 20
to 25 knots. Seas 2 to 4 feet, occasionally to 5 feet. Nearshore
waters rough, becoming very rough.
.MONDAY NIGHT...Northeast to east winds 20 to 25 knots. Seas 3 to
5 feet, occasionally to 6 feet. Nearshore waters very rough.
.TUESDAY AND TUESDAY NIGHT...Northeast to east winds near 20
knots. Seas 3 to 5 feet, occasionally to 6 feet. Nearshore waters
rough.
.WEDNESDAY AND WEDNESDAY NIGHT...Northeast to east winds near 20
knots. Seas 3 to 4 feet, occasionally to 5 feet. Nearshore waters
rough.
$$
GMZ052>055-072>075-202130-
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 AM EST Sat Dec 20 2025
.TODAY...North to northeast winds near 15 knots, becoming
northeast to east and decreasing to 10 to 15 knots. Seas 1 to 3
feet. Wave Detail: North 2 feet at 4 seconds.
.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. 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 3 to 5 feet, occasionally to 7 feet, building to 4
to 6 feet, occasionally to 8 feet. Isolated showers.
.MONDAY...Northeast to east 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...Northeast to east winds near 20 knots. Seas 5 to 7
feet, occasionally to 9 feet.
.WEDNESDAY NIGHT...Northeast to east winds 20 to 25 knots. Seas
6 to 8 feet, occasionally to 10 feet.
$$
GMZ033-034-202130-
Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM
out and beyond 5 fathoms-
Gulf of America including Dry Tortugas and Rebecca Shoal Channel-
428 AM EST Sat Dec 20 2025
.TODAY...North to northeast winds near 15 knots, becoming
northeast and decreasing to 5 to 10 knots. Seas 2 to 3 feet. Wave
Detail: Northwest to north 3 feet at 4 seconds.
.TONIGHT...Northeast winds 5 to 10 knots, increasing to near 10
knots after midnight. Seas 2 to 3 feet. Wave Detail: Northwest 2
feet at 6 seconds.
.SUNDAY...Northeast winds 10 to 15 knots, decreasing briefly to 5
to 10 knots in the afternoon. Seas 1 to 3 feet. Wave Detail:
Northwest 2 feet at 6 seconds and northeast to east 1 foot at 3
seconds.
.SUNDAY NIGHT...Northeast winds near 10 knots, increasing to near
15 knots. Seas 1 to 3 feet, building to 2 to 3 feet.
.MONDAY...Northeast to east winds 15 to 20 knots. Seas 2 to
4 feet, occasionally to 5 feet.
.MONDAY NIGHT...Northeast to east winds 15 to 20 knots. Seas 3 to
5 feet, occasionally to 6 feet.
.TUESDAY AND TUESDAY NIGHT...Northeast to east winds 15 to 20
knots. Seas 3 to 5 feet, occasionally to 6 feet.
.WEDNESDAY...Northeast winds 15 to 20 knots. Seas 3 to 5 feet,
occasionally to 6 feet.
.WEDNESDAY NIGHT...Northeast to east winds 15 to 20 knots. Seas
2 to 4 feet, occasionally to 5 feet.
$$
MJV
CWFKEY
Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
428 AM 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.
GMZ005-202130-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
428 AM EST Sat Dec 20 2025
.SYNOPSIS...A very weak cold front over the southern Florida
Peninsula and southern Gulf will move southward today, becoming
stationary over the Straits of Florida. A brief surge of moderate
to fresh northerly breezes will follow the front, peaking early
this morning. A continental high pressure cell will advance
eastward from the southeastern United States to the western North
Atlantic this weekend. The high will be reinforced by cold
continental air Sunday and Sunday night, and fresh to strong
northeast to east breezes are expected to develop across all
Florida Keys coastal waters Sunday night, persisting through at
least Christmas Eve.
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.
$$
GMZ031-202130-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
428 AM EST Sat Dec 20 2025
.TODAY...Northeast winds near 15 knots, becoming east and
decreasing to 5 to 10 knots. Bay waters a moderate chop, becoming
smooth to a light chop.
.TONIGHT...Northeast to east winds 5 to 10 knots. Bay waters
smooth to a light chop.
.SUNDAY...Northeast to east winds near 10 knots, increasing to 10
to 15 knots. Bay waters a light chop, becoming a light to
moderate chop.
.SUNDAY NIGHT...Northeast winds near 15 knots. Bay waters a
moderate chop.
.MONDAY...Northeast to east winds 15 to 20 knots, increasing to
near 20 knots. Bay waters choppy, becoming rough.
.MONDAY NIGHT...Northeast to east winds near 20 knots, decreasing
to 15 to 20 knots. Bay waters rough, becoming choppy.
.TUESDAY THROUGH WEDNESDAY NIGHT...Northeast to east winds 15 to
20 knots. Bay waters choppy.
$$
GMZ032-035-202130-
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 AM EST Sat Dec 20 2025
.TODAY...North to northeast winds near 15 knots, becoming
northeast to east and decreasing to 5 to 10 knots. Seas 1 to 2
feet, except around 2 feet west of the Marquesas Keys. Nearshore
waters a moderate chop, becoming smooth to a light chop.
.TONIGHT...Northeast to east winds near 10 knots. Seas 1 to
2 feet, except around 2 feet west of the Marquesas Keys.
Nearshore waters a light chop.
.SUNDAY...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.
.SUNDAY NIGHT...Northeast to east winds 10 to 15 knots, increasing
to 15 to 20 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 choppy.
.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.
.MONDAY NIGHT...Northeast to east winds near 20 knots, decreasing
to 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 rough, becoming choppy.
.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 AND WEDNESDAY...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.
.WEDNESDAY NIGHT...Northeast to east winds 15 to 20 knots. Seas
2 to 3 feet, except 3 to 4 feet, occasionally to 5 feet west of
the Marquesas Keys. Nearshore waters choppy.
$$
GMZ042>044-202130-
Hawk Channel from Ocean Reef to Craig Key out to the reef-
Hawk Channel from Craig Key to west end of Seven Mile Bridge out
to the reef-
Hawk Channel from west end of Seven Mile Bridge to Halfmoon Shoal
out to the reef-
428 AM EST Sat Dec 20 2025
.TODAY...Northeast winds near 15 knots, becoming northeast to
east and decreasing to near 10 knots. Seas 1 to 2 feet, except
around 2 feet west of Cosgrove Shoal Light. Nearshore waters a
moderate chop, becoming a light chop.
.TONIGHT...Northeast to east winds near 10 knots. Seas 1 to
2 feet. Nearshore waters a light chop.
.SUNDAY...Northeast to east winds 10 to 15 knots. Seas around 2 feet.
Nearshore waters a light to moderate chop.
.SUNDAY NIGHT...Northeast winds near 15 knots, increasing to 15
to 20 knots. Seas 2 to 3 feet. Nearshore waters a moderate chop,
becoming choppy.
.MONDAY...Northeast to east winds near 20 knots, increasing to 20
to 25 knots. Seas 2 to 4 feet, occasionally to 5 feet. Nearshore
waters rough, becoming very rough.
.MONDAY NIGHT...Northeast to east winds 20 to 25 knots. Seas 3 to
5 feet, occasionally to 6 feet. Nearshore waters very rough.
.TUESDAY AND TUESDAY NIGHT...Northeast to east winds near 20
knots. Seas 3 to 5 feet, occasionally to 6 feet. Nearshore waters
rough.
.WEDNESDAY AND WEDNESDAY NIGHT...Northeast to east winds near 20
knots. Seas 3 to 4 feet, occasionally to 5 feet. Nearshore waters
rough.
$$
GMZ052>055-072>075-202130-
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 AM EST Sat Dec 20 2025
.TODAY...North to northeast winds near 15 knots, becoming
northeast to east and decreasing to 10 to 15 knots. Seas 1 to 3
feet. Wave Detail: North 2 feet at 4 seconds.
.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. 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 3 to 5 feet, occasionally to 7 feet, building to 4
to 6 feet, occasionally to 8 feet. Isolated showers.
.MONDAY...Northeast to east 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...Northeast to east winds near 20 knots. Seas 5 to 7
feet, occasionally to 9 feet.
.WEDNESDAY NIGHT...Northeast to east winds 20 to 25 knots. Seas
6 to 8 feet, occasionally to 10 feet.
$$
GMZ033-034-202130-
Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM
out and beyond 5 fathoms-
Gulf of America including Dry Tortugas and Rebecca Shoal Channel-
428 AM EST Sat Dec 20 2025
.TODAY...North to northeast winds near 15 knots, becoming
northeast and decreasing to 5 to 10 knots. Seas 2 to 3 feet. Wave
Detail: Northwest to north 3 feet at 4 seconds.
.TONIGHT...Northeast winds 5 to 10 knots, increasing to near 10
knots after midnight. Seas 2 to 3 feet. Wave Detail: Northwest 2
feet at 6 seconds.
.SUNDAY...Northeast winds 10 to 15 knots, decreasing briefly to 5
to 10 knots in the afternoon. Seas 1 to 3 feet. Wave Detail:
Northwest 2 feet at 6 seconds and northeast to east 1 foot at 3
seconds.
.SUNDAY NIGHT...Northeast winds near 10 knots, increasing to near
15 knots. Seas 1 to 3 feet, building to 2 to 3 feet.
.MONDAY...Northeast to east winds 15 to 20 knots. Seas 2 to
4 feet, occasionally to 5 feet.
.MONDAY NIGHT...Northeast to east winds 15 to 20 knots. Seas 3 to
5 feet, occasionally to 6 feet.
.TUESDAY AND TUESDAY NIGHT...Northeast to east winds 15 to 20
knots. Seas 3 to 5 feet, occasionally to 6 feet.
.WEDNESDAY...Northeast winds 15 to 20 knots. Seas 3 to 5 feet,
occasionally to 6 feet.
.WEDNESDAY NIGHT...Northeast to east winds 15 to 20 knots. Seas
2 to 4 feet, occasionally to 5 feet.
$$
MJV