National Weather Service Marine Forecast FZUS52 KKEY

FZUS52 KKEY 281430
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
1030 AM EDT Tue Apr 28 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.

GMZ005-290230
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas 1030 AM EDT Tue Apr 28 2026

SYNOPSIS
High pressure centered over the Mid-Atlantic will continue to promote gentle to moderate northeast to east breezes through tonight. As the high slides into the western North Atlantic through mid-week, breezes will gradually veer to the east to southeast. Multiple low pressure systems are expected to traverse across the eastern U.S. mid to late week. This combined with weak low pressure across the western North Atlantic will result in a period of mainly southeast to south breezes.

The Approximate Shoreward Edge of the Gulf Stream as of April 22...

19 NM South of Dry Tortugas Light...on Loggerhead Key. 11 NM South of Cosgrove Shoal Light...off the Marquesas Keys. 8 NM South of Sand Key Light...off Key West. 13 NM South of Looe Key...off Big Pine Key. 19 NM Southeast of Sombrero Key Light...off Marathon. 24 NM Southeast of Alligator Reef Light...off Islamorada. 26 NM Southeast of Molasses Reef Light...off Key Largo. 14 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.

GMZ031-290230
Florida Bay including Barnes Sound, Blackwater Sound, and Buttonwood Sound
1030 AM EDT Tue Apr 28 2026

THIS AFTERNOON
Northeast to east winds 10 to 15 knots, becoming east and decreasing to near 10 knots. Bay waters a light to moderate chop, becoming a light chop. A slight chance of showers.

TONIGHT
East winds 10 to 15 knots, becoming east to southeast and decreasing to near 10 knots. Bay waters a light to moderate chop, becoming a light chop. A slight chance of showers.

WEDNESDAY
East to southeast winds near 10 knots, becoming southeast to south. Bay waters a light chop.

WEDNESDAY NIGHT
Southeast to south winds 5 to 10 knots. Bay waters smooth to a light chop. A slight chance of showers.

THURSDAY
South winds near 5 knots, becoming south to southwest and increasing to near 10 knots in the afternoon. Bay waters smooth, becoming a light chop.

THURSDAY NIGHT
South to southwest winds 5 to 10 knots, becoming south and decreasing to near 5 knots. Bay waters smooth to a light chop, becoming smooth.

FRIDAY
South winds 5 to 10 knots. Bay waters smooth to a light chop.

FRIDAY NIGHT
Southeast to south winds 5 to 10 knots, increasing to 10 to 15 knots after midnight. Bay waters smooth to a light chop, becoming a light to moderate chop.

SATURDAY
Southeast to south winds near 15 knots, becoming south and decreasing to near 10 knots. Bay waters a moderate chop, becoming a light chop.

SATURDAY NIGHT
Southeast to south winds 5 to 10 knots. Bay waters smooth to a light chop. A slight chance of showers.

GMZ032-035-290230
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
1030 AM EDT Tue Apr 28 2026

THIS AFTERNOON
Northeast to east winds near 15 knots, becoming east and decreasing to near 10 knots. Seas 1 to 2 feet, except around 2 feet west of the Marquesas Keys. Nearshore waters a moderate chop, becoming a light chop. A slight chance of showers.

TONIGHT
East winds 10 to 15 knots, becoming east to southeast and decreasing to near 10 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate chop, becoming a light chop. A slight chance of showers.

WEDNESDAY
East to southeast winds 5 to 10 knots, becoming southeast. Seas around 1 foot. Nearshore waters smooth to a light chop.

WEDNESDAY NIGHT
Southeast winds 5 to 10 knots, becoming southeast to south. Seas around 1 foot. Nearshore waters smooth to a light chop.

THURSDAY
Southeast to south winds 5 to 10 knots, becoming south. Seas around 1 foot. Nearshore waters smooth to a light chop.

THURSDAY NIGHT
West to northwest winds near 5 knots, becoming southeast after midnight. Seas 1 foot or less. Nearshore waters smooth.

FRIDAY
Southeast to south winds 5 to 10 knots. Seas around 1 foot. Nearshore waters smooth to a light chop.

FRIDAY NIGHT
East to southeast winds 5 to 10 knots, becoming southeast to south and increasing to near 15 knots after midnight. Seas around 1 foot, building 1 to 2 feet, except building to 2 to 3 feet west of the Marquesas Keys. Nearshore waters smooth to a light chop, becoming a moderate chop.

SATURDAY
Southeast to south winds near 15 knots, becoming south and decreasing to 5 to 10 knots. Seas 1 to 2 feet, subsiding to around 1 foot. West of the Marquesas Keys, seas 2 to 3 feet, subsiding to 1 to 2 feet. Nearshore waters a moderate chop, becoming smooth to a light chop.

SATURDAY NIGHT
Southeast winds 5 to 10 knots, becoming south and increasing to 10 to 15 knots. Seas around 1 foot, except around 2 feet west of the Marquesas Keys. Nearshore waters smooth to a light chop, becoming a light to moderate chop. A slight chance of showers.

GMZ042>044-290230
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
1030 AM EDT Tue Apr 28 2026

THIS AFTERNOON
Northeast to east winds 10 to 15 knots, becoming east and decreasing to near 10 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate chop, becoming a light chop. A slight chance of showers.

WEDNESDAY
East to southeast winds near 10 knots, becoming southeast. Seas 1 to 2 feet. Nearshore waters a light chop.

WEDNESDAY NIGHT
Southeast winds 5 to 10 knots, becoming southeast to south. Seas around 1 foot. Nearshore waters smooth to a light chop. A slight chance of showers.

THURSDAY
Southeast to south winds 5 to 10 knots. Seas around 1 foot. Nearshore waters smooth to a light chop.

THURSDAY NIGHT
East to southeast winds near 5 knots, becoming southeast to south. Seas around 1 foot. Nearshore waters smooth.

FRIDAY
Southeast to south winds 5 to 10 knots. Seas around 1 foot. Nearshore waters smooth to a light chop.

FRIDAY NIGHT
East to southeast winds near 10 knots, becoming southeast to south and increasing to near 15 knots after midnight. Seas around 1 foot, building to 2 to 3 feet. Nearshore waters a light chop, becoming a moderate chop.

SATURDAY
Southeast to south winds near 15 knots, decreasing to 5 to 10 knots. Seas 2 to 3 feet, subsiding to 1 to 2 feet. Nearshore waters a moderate chop, becoming smooth to a light chop.

SATURDAY NIGHT
Southeast winds 5 to 10 knots, becoming south and increasing to 10 to 15 knots. Seas 1 to 2 feet, building to around 2 feet. Nearshore waters smooth to a light chop, becoming a light to moderate chop. A slight chance of showers.

GMZ052>055-072>075-290230
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
1030 AM EDT Tue Apr 28 2026

THIS AFTERNOON
Northeast to east winds 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast to east 3 feet at 5 seconds.

TONIGHT
East winds 10 to 15 knots, becoming east to southeast. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: East 3 feet at 5 seconds. A slight chance of showers.

WEDNESDAY
East to southeast winds near 10 knots. Seas 2 to 3 feet. Wave Detail: East to southeast 3 feet at 5 seconds. A slight chance of showers.

WEDNESDAY NIGHT
East to southeast winds near 10 knots. Seas around 2 feet.

THURSDAY
Southeast winds 5 to 10 knots. Seas 1 to 2 feet.

THURSDAY NIGHT
Northeast to east winds 5 to 10 knots, becoming southeast after midnight. Seas 1 to 2 feet.

FRIDAY
Southeast winds 5 to 10 knots, becoming east to southeast and increasing to near 10 knots. Seas 1 to 2 feet, building to around 2 feet.

FRIDAY NIGHT
East to southeast winds 10 to 15 knots, becoming southeast to south and increasing to near 15 knots. Seas 2 to 4 feet, occasionally to 5 feet.

SATURDAY
Southeast to south winds near 15 knots, becoming east to southeast and decreasing to near 10 knots. Seas 2 to 4 feet, occasionally to 5 feet, subsiding to 2 to 3 feet.

SATURDAY NIGHT
East to southeast winds 5 to 10 knots, becoming south and increasing to 10 to 15 knots. Seas 2 to 3 feet. A slight chance of showers.

GMZ033-034-290230
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
1030 AM EDT Tue Apr 28 2026

THIS AFTERNOON
Northeast to east winds near 15 knots, decreasing to 5 to 10 knots. Seas 2 to 3 feet, subsiding to 1 to 2 feet. Wave Detail: Northeast to east 2 feet at 4 seconds.

TONIGHT
East winds 5 to 10 knots, becoming east to southeast and increasing to near 10 knots. Seas 1 to 2 feet. Wave Detail: East 2 feet at 4 seconds. A slight chance of showers.

WEDNESDAY
East to southeast winds 5 to 10 knots. Seas 1 to 2 feet. Wave Detail: East to southeast 1 foot at 3 seconds.

WEDNESDAY NIGHT
Southeast winds 5 to 10 knots. Seas around 1 foot.

THURSDAY
Southeast to south winds near 5 knots. Seas 1 foot or less.

THURSDAY NIGHT
North winds near 5 knots, becoming east to southeast after midnight. Seas 1 foot or less.

FRIDAY
Southeast winds 5 to 10 knots. Seas around 1 foot.

FRIDAY NIGHT
East to southeast winds 5 to 10 knots, becoming southeast to south and increasing to near 15 knots after midnight. Seas 1 to 2 feet, building to 2 to 3 feet.

SATURDAY
Southeast to south winds near 15 knots, becoming south and decreasing to 5 to 10 knots. Seas 2 to 3 feet.

SATURDAY NIGHT
Southeast winds 5 to 10 knots, becoming south and increasing to 10 to 15 knots. Seas 2 to 3 feet. A slight chance of showers.

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