National Weather Service Marine Forecast FZUS52 KKEY
FZUS52 KKEY 191443
CWFKEY
Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
1043 AM EDT Tue May 19 2026
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.
GMZ005-200245
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1043 AM EDT Tue May 19 2026
SYNOPSIS
Surface high pressure centered north of Bermuda will
continue to promote moderate to fresh east to southeast breezes
through tonight. Highest breezes will prevail through this
evening. Breezes will then slowly slacken before the weekend with
peaks expected during the evenings and lulls during the day. Rain
and thunder chances will remain above normal through much of the
week.
The Approximate Shoreward Edge of the Gulf Stream as of May 12...
35 NM South of Dry Tortugas Light...on Loggerhead Key. 9 NM South of Cosgrove Shoal Light...off the Marquesas Keys. 6 NM South of Sand Key Light...off Key West. 7 NM South of Looe Key...off Big Pine Key. 6 NM Southeast of Sombrero Key Light...off Marathon. 6 NM Southeast of Alligator Reef Light...off Islamorada. 4 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.
GMZ031-200245
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound
1043 AM EDT Tue May 19 2026
SMALL CRAFT SHOULD EXERCISE CAUTION
THIS AFTERNOON
East winds 15 to 20 knots. Bay waters choppy. A
chance of showers with a slight chance of thunderstorms.
TONIGHT
East winds 15 to 20 knots in the evening, decreasing to
near 15 knots. Bay waters choppy, becoming a moderate chop. A
chance of showers with a slight chance of thunderstorms.
WEDNESDAY
East winds 10 to 15 knots. Bay waters a light to
moderate chop. A chance of showers with a slight chance of
thunderstorms.
WEDNESDAY NIGHT
East winds 10 to 15 knots, decreasing to near
10 knots. Bay waters a light to moderate chop, becoming a light
chop. A chance of showers with a slight chance of thunderstorms.
THURSDAY
East winds near 10 knots, increasing to 10 to 15
knots. Bay waters a light chop, becoming a light to moderate
chop. A slight chance of showers and thunderstorms.
THURSDAY NIGHT
East winds 10 to 15 knots. Bay waters a light
to moderate chop. A slight chance of showers and thunderstorms.
FRIDAY
East to southeast winds near 10 knots. Bay waters a
light chop. A slight chance of showers and thunderstorms.
FRIDAY NIGHT
East to southeast winds 10 to 15 knots. Bay
waters a light to moderate chop. A slight chance of showers and
thunderstorms.
SATURDAY
East to southeast winds 10 to 15 knots. Bay waters a
light to moderate chop. A chance of showers with a slight chance
of thunderstorms.
SATURDAY NIGHT
East to southeast winds 10 to 15 knots. Bay
waters a light to moderate chop. A chance of showers with a
slight chance of thunderstorms.
GMZ032-035-200245
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
1043 AM EDT Tue May 19 2026
SMALL CRAFT SHOULD EXERCISE CAUTION
THIS AFTERNOON
East winds 15 to 20 knots. Seas 2 to 3 feet,
except around 3 feet west of the Marquesas Keys. Nearshore waters
choppy. Showers likely with a slight chance of thunderstorms.
TONIGHT
East winds 15 to 20 knots, decreasing to near 15 knots.
Seas 1 to 2 feet, except around 3 feet west of the Marquesas
Keys. Nearshore waters choppy, becoming a moderate chop. A chance
of showers with a slight chance of thunderstorms.
WEDNESDAY
East winds 10 to 15 knots. Seas 1 to 2 feet, except
subsiding to 2 to 3 feet west of the Marquesas Keys. Nearshore
waters a light to moderate chop. A chance of showers with a slight
chance of thunderstorms.
WEDNESDAY NIGHT
East winds 10 to 15 knots. Seas 1 to 2 feet.
Nearshore waters a light to moderate chop. A chance of showers
with a slight chance of thunderstorms.
THURSDAY
East 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. A slight chance of showers and
thunderstorms.
THURSDAY NIGHT
East winds 10 to 15 knots. Seas 1 to 2 feet.
Nearshore waters a light to moderate chop. A slight chance of
showers and thunderstorms.
FRIDAY
East to southeast winds near 10 knots. Seas around 1
foot. Nearshore waters a light chop. A slight chance of showers
and thunderstorms.
FRIDAY NIGHT
East to southeast winds 10 to 15 knots. Seas
1 to 2 feet. Nearshore waters a light to moderate chop. A slight
chance of showers and thunderstorms.
SATURDAY
East to southeast winds near 10 knots. Seas around 1
foot. Nearshore waters a light chop. A slight chance of showers
and thunderstorms.
SATURDAY NIGHT
East to southeast winds 10 to 15 knots. Seas
1 to 2 feet. Nearshore waters a light to moderate chop. A chance
of showers with a slight chance of thunderstorms.
GMZ042>044-200245
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
1043 AM EDT Tue May 19 2026
SMALL CRAFT SHOULD EXERCISE CAUTION
THIS AFTERNOON
East winds 15 to 20 knots. Seas 2 to 4 feet,
occasionally to 5 feet. Nearshore waters choppy. A chance of
showers with a slight chance of thunderstorms.
TONIGHT
East winds 15 to 20 knots, decreasing to near 15 knots.
Seas 2 to 4 feet, occasionally to 5 feet, subsiding to 2 to 3
feet. Nearshore waters choppy, becoming a moderate chop. A chance
of showers with a slight chance of thunderstorms.
WEDNESDAY
East winds 10 to 15 knots. Seas 1 to 2 feet, except
2 to 3 feet west of Cosgrove Shoal Light. Nearshore waters a
light to moderate chop. A chance of showers with a slight chance
of thunderstorms.
WEDNESDAY NIGHT
East winds 10 to 15 knots. Seas 1 to 2 feet,
except 2 to 3 feet west of Cosgrove Shoal Light. Nearshore waters
a light to moderate chop. A chance of showers with a slight
chance of thunderstorms.
THURSDAY
East 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. A slight chance of showers and
thunderstorms.
THURSDAY NIGHT
East winds 10 to 15 knots, becoming east to
southeast. Seas around 2 feet. Nearshore waters a light to
moderate chop. A slight chance of showers and thunderstorms.
FRIDAY
East to southeast winds near 10 knots. Seas 1 to
2 feet. Nearshore waters a light chop. A slight chance of showers
and thunderstorms.
FRIDAY NIGHT
East to southeast winds 10 to 15 knots. Seas
around 2 feet. Nearshore waters a light to moderate chop. A
slight chance of showers and thunderstorms.
SATURDAY
East to southeast winds near 10 knots. Seas 1 to
2 feet. Nearshore waters a light chop. A slight chance of showers
and thunderstorms.
SATURDAY NIGHT
East to southeast 10 to 15 knots. Seas 2 to 3
feet. Nearshore waters a light to moderate chop. A chance of
showers with a slight chance of thunderstorms.
GMZ052>055-072>075-200245
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
1043 AM EDT Tue May 19 2026
SMALL CRAFT SHOULD EXERCISE CAUTION
THIS AFTERNOON
East winds 15 to 20 knots. Seas 3 to 5 feet,
occasionally to 6 feet. Wave Detail: East 4 feet at 6 seconds. A
chance of showers with a slight chance of thunderstorms.
TONIGHT
East winds 15 to 20 knots, decreasing to near 15 knots.
Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East 4
feet at 5 seconds. A chance of showers with a slight chance of
thunderstorms.
WEDNESDAY
East winds 10 to 15 knots. Seas 3 to 4 feet,
occasionally to 5 feet. Wave Detail: East 4 feet at 5 seconds. A
chance of showers with a slight chance of thunderstorms.
WEDNESDAY NIGHT
East winds 10 to 15 knots. Seas 3 to 4 feet,
occasionally to 5 feet. A chance of showers with a slight chance
of thunderstorms.
THURSDAY
East winds 10 to 15 knots. Seas 2 to 4 feet,
occasionally to 5 feet. A slight chance of showers and
thunderstorms.
THURSDAY NIGHT
East winds 10 to 15 knots, becoming east to
southeast. Seas 2 to 4 feet, occasionally to 5 feet. A slight
chance of showers and thunderstorms.
FRIDAY
East to southeast winds near 10 knots. Seas 2 to 3 feet.
A slight chance of showers and thunderstorms.
FRIDAY NIGHT
East to southeast winds 10 to 15 knots. Seas
2 to 4 feet, occasionally to 5 feet. A slight chance of showers
and thunderstorms.
SATURDAY
East to southeast winds 10 to 15 knots. Seas 2 to 4
feet, occasionally to 5 feet. A slight chance of showers and
thunderstorms.
SATURDAY NIGHT
East to southeast winds 10 to 15 knots. Seas 2
to 4 feet, occasionally to 5 feet. A chance of showers with a
slight chance of thunderstorms.
GMZ033-034-200245
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
1043 AM EDT Tue May 19 2026
SMALL CRAFT SHOULD EXERCISE CAUTION
THIS AFTERNOON
East winds 15 to 20 knots. Seas 2 to 4 feet,
occasionally to 5 feet. Wave Detail: East 4 feet at 5 seconds. A
chance of showers with a slight chance of thunderstorms.
TONIGHT
East winds 15 to 20 knots, decreasing to near 15 knots.
Seas 2 to 4 feet, occasionally to 5 feet, subsiding to 2 to 3
feet. Wave Detail: East 3 feet at 4 seconds. A chance of showers
with a slight chance of thunderstorms.
WEDNESDAY
East winds 10 to 15 knots. Seas 2 to 3 feet. Wave
Detail: East 3 feet at 5 seconds. A chance of showers with a
slight chance of thunderstorms.
WEDNESDAY NIGHT
East winds 10 to 15 knots. Seas 2 to 3 feet. A
chance of showers with a slight chance of thunderstorms.
THURSDAY
East winds near 10 knots. Seas around 2 feet. A
slight chance of showers and thunderstorms.
THURSDAY NIGHT
East winds 10 to 15 knots, becoming east to
southeast. Seas around 2 feet. A slight chance of showers and
thunderstorms.
FRIDAY
East to southeast winds near 10 knots. Seas 1 to 2
feet. A slight chance of showers and thunderstorms.
FRIDAY NIGHT
East to southeast winds near 10 knots. Seas 1 to 2
feet. A slight chance of showers and thunderstorms.
SATURDAY
East to southeast winds 5 to 10 knots, increasing to
near 10 knots. Seas around 1 foot. A slight chance of showers and
thunderstorms.
SATURDAY NIGHT
East to southeast winds 10 to 15 knots. Seas
1 to 2 feet. A slight chance of showers and thunderstorms.
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