National Weather Service Marine Forecast FZUS52 KKEY

FZUS52 KKEY 112032
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
432 PM EDT Tue Aug 11 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.

The Wave Detail section highlights the period and direction of origin for the highest-energy waves, as well as any long-period swells moving in a different direction than the wind.

GMZ005-120845
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas 432 PM EDT Tue Aug 11 2026

SYNOPSIS
While there are no marine hazard products in place across the Florida Keys local waters, a Coastal Flood Statement is in effect for the Lower Keys due to higher water levels around times of high tide. Anyone on the water should be aware of reduced clearance underneath fixed bridges over the next few days. Ridging across Central Florida will shift southwards into Central and South Florida and weaken over the next couple of days. Gentle to moderate breezes will trend downwards to a light breeze through this period, with some directional variability creeping in. Winds are expected to freshen late in the week as the ridge lifts back into northern Florida and a broad lower level trough moves westward across our area. Expect shower and thunderstorm chances to tick up at that time.

The Approximate Shoreward Edge of the Gulf Stream as of August 7, 2026...

25 NM South of Dry Tortugas Light...on Loggerhead Key. 15 NM South of Cosgrove Shoal Light...off the Marquesas Keys. 19 NM South of Sand Key Light...off Key West. 29 NM South of Looe Key...off Big Pine Key. 16 NM Southeast of Sombrero Key Light...off Marathon. 4 NM Southeast of Alligator Reef Light...off Islamorada. 2 NM Southeast of Molasses Reef Light...off Key Largo. 1 NM Southeast of Carysfort Reef Light...off Ocean Reef.

Gulf Stream Information Courtesy of the National Weather Service in Key West, using data from RTOFS and NASA SPoRT SST.

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GMZ031-120845
Florida Bay including Barnes Sound, Blackwater Sound, and Buttonwood Sound
432 PM EDT Tue Aug 11 2026

TONIGHT
East winds 5 to 10 knots. Bay waters smooth to a light chop. A slight chance of showers and thunderstorms.

WEDNESDAY
East to southeast winds near 5 knots. Bay waters smooth. A slight chance of showers and thunderstorms.

WEDNESDAY NIGHT
Southeast winds near 5 knots. Bay waters smooth. A slight chance of showers and thunderstorms.

THURSDAY
Southeast winds near 5 knots. Bay waters smooth. A slight chance of showers and thunderstorms.

THURSDAY NIGHT
East to southeast winds 5 to 10 knots. Bay waters smooth to a light chop. A slight chance of showers and thunderstorms.

FRIDAY
East to southeast winds 5 to 10 knots, increasing to east 10 to 15 knots in the afternoon. Bay waters smooth to a light chop, becoming a light to moderate chop. A chance of showers and thunderstorms.

FRIDAY NIGHT
East to southeast winds 10 to 15 knots. Bay waters a light to moderate chop. A chance of showers and thunderstorms.

SATURDAY
East to southeast winds 10 to 15 knots. Bay waters a light to moderate chop. A slight chance of showers and thunderstorms.

SATURDAY NIGHT
East winds 10 to 15 knots. Bay waters a light to moderate chop.

SUNDAY
East to southeast winds near 10 knots. Bay waters a light chop.

SUNDAY NIGHT
East winds 10 to 15 knots, decreasing to 5 to 10 knots. Bay waters a light to moderate chop, becoming smooth to a light chop.

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GMZ032-035-120845
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
432 PM EDT Tue Aug 11 2026

TONIGHT
East to southeast winds 5 to 10 knots. Seas around 1 foot. Nearshore waters smooth to a light chop. A slight chance of showers and thunderstorms.

WEDNESDAY
East winds 5 to 10 knots, decreasing to near 5 knots. Seas around 1 foot. Nearshore waters smooth to a light chop, becoming smooth. A slight chance of showers and thunderstorms.

WEDNESDAY NIGHT
East winds near 5 knots. Seas 1 foot or less. Nearshore waters smooth. A slight chance of showers and thunderstorms.

THURSDAY
East to southeast winds near 5 knots. Seas 1 foot or less. Nearshore waters smooth. A slight chance of showers and thunderstorms.

THURSDAY NIGHT
East winds near 5 knots, increasing to 5 to 10 knots. Seas 1 foot or less, building to around 1 foot. Nearshore waters smooth, becoming smooth to a light chop. A slight chance of showers and thunderstorms.

FRIDAY
East winds 5 to 10 knots, increasing to 10 to 15 knots. Seas around 1 foot, building to 1 to 2 feet. Nearshore waters smooth to a light chop, becoming a light to moderate chop. A chance of showers and thunderstorms.

FRIDAY NIGHT
East winds 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate chop. A chance of showers and thunderstorms.

SATURDAY
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 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.

SUNDAY
East to southeast winds 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate chop.

SUNDAY NIGHT
East winds 10 to 15 knots, decreasing to 5 to 10 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate chop, becoming smooth to a light chop.

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GMZ042>044-120845
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
432 PM EDT Tue Aug 11 2026

TONIGHT
East winds near 10 knots, decreasing to 5 to 10 knots. Seas 1 to 2 feet. Nearshore waters smooth to a light chop. A slight chance of showers and thunderstorms.

WEDNESDAY
East winds 5 to 10 knots, decreasing to near 5 knots. Seas 1 to 2 feet. Nearshore waters smooth to a light chop.

WEDNESDAY NIGHT
East winds near 5 knots, increasing to east to southeast after midnight. Seas around 1 foot. Nearshore waters smooth.

THURSDAY
East to southeast winds near 5 knots. Seas around 1 foot. Nearshore waters smooth. A slight chance of showers and thunderstorms.

THURSDAY NIGHT
East winds near 5 knots, increasing to 5 to 10 knots. Seas around 1 foot, building to 1 to 2 feet. Nearshore waters smooth, becoming smooth to a light chop. A slight chance of showers and thunderstorms.

FRIDAY
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 chance of showers and thunderstorms.

FRIDAY NIGHT
East winds 10 to 15 knots, increasing to near 15 knots. Seas building to 2 to 3 feet. Nearshore waters a light to moderate chop. A chance of showers and thunderstorms.

SATURDAY
East to southeast winds near 15 knots. Seas 2 to 3 feet. Nearshore waters a moderate chop. A slight chance of showers and thunderstorms.

SATURDAY NIGHT
East winds 10 to 15 knots. Seas 2 to 3 feet. Nearshore waters a light to moderate chop. A slight chance of showers.

SUNDAY
East to southeast winds 10 to 15 knots. Seas 2 to 3 feet. Nearshore waters a light to moderate chop.

SUNDAY NIGHT
East winds 10 to 15 knots, decreasing to near 10 knots. Seas around 2 feet. Nearshore waters a light to moderate chop.

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GMZ052>055-072>075-120845
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
432 PM EDT Tue Aug 11 2026

TONIGHT
East winds 10 to 15 knots, decreasing to near 10 knots. Seas 2 to 3 feet. Wave Detail: East 3 feet at 5 seconds.

WEDNESDAY
East winds near 10 knots, decreasing to 5 to 10 knots. Seas 2 to 3 feet, subsiding to 1 to 2 feet. Wave Detail: East 3 feet at 5 seconds.

WEDNESDAY NIGHT
East winds 5 to 10 knots. Seas 1 to 2 feet. Wave Detail: East 2 feet at 4 seconds.

THURSDAY
East winds 5 to 10 knots, increasing to near 10 knots. Seas 1 to 2 feet. A slight chance of showers and thunderstorms.

THURSDAY NIGHT
East winds increasing to 10 to 15 knots. Seas building to 2 to 3 feet. A slight chance of showers and thunderstorms.

FRIDAY
East winds 10 to 15 knots. Seas 2 to 3 feet. A chance of showers and thunderstorms.

FRIDAY NIGHT
East winds near 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. A chance of showers and thunderstorms.

SATURDAY
East winds 10 to 15 knots. Seas 2 to 3 feet. A slight chance of showers and thunderstorms.

SATURDAY NIGHT THROUGH SUNDAY NIGHT
East winds near 15 knots. Seas 2 to 4 feet, occasionally to 5 feet.

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GMZ033-034-120845
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
432 PM EDT Tue Aug 11 2026

TONIGHT
East winds 5 to 10 knots. Seas 1 to 2 feet. Wave Detail: East 1 foot at 3 seconds. A slight chance of showers and thunderstorms.

WEDNESDAY
East winds 5 to 10 knots, becoming variable and decreasing to near 5 knots. Seas 1 to 2 feet, subsiding to around 1 foot. Wave Detail: East 1 foot at 3 seconds. A slight chance of showers and thunderstorms.

WEDNESDAY NIGHT
Northeast winds near 5 knots. Seas 1 foot or less. A slight chance of showers and thunderstorms.

THURSDAY
Northeast to east winds near 5 knots. Seas 1 foot or less. A chance of showers with a slight chance of thunderstorms.

THURSDAY NIGHT
Northeast to east winds 5 to 10 knots. Seas 1 foot or less. A slight chance of showers and thunderstorms.

FRIDAY
East winds 5 to 10 knots, increasing to near 10 knots. Seas around 1 foot, building to 1 to 2 feet. A chance of showers and thunderstorms.

FRIDAY NIGHT
East winds 10 to 15 knots. Seas 1 to 2 feet. A chance of showers and thunderstorms.

SATURDAY
East to southeast winds 10 to 15 knots. Seas 1 to 2 feet. A slight chance of showers and thunderstorms.

SATURDAY NIGHT
East winds 10 to 15 knots. Seas 1 to 2 feet. A slight chance of showers and thunderstorms.

SUNDAY AND SUNDAY NIGHT
East to southeast winds 5 to 10 knots. Seas 1 to 2 feet.

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DP