National Weather Service Marine Forecast FZUS52 KKEY

FZUS52 KKEY 151431
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
1031 AM EDT Wed Apr 15 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.

GMZ005-160245
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas 1031 AM EDT Wed Apr 15 2026

SYNOPSIS
A high pressure system over the central North Atlantic will maintain moderate northeast to east breezes (except moderate to occasionally fresh Florida Straits) through tonight. Occasional fast- moving light showers cannot be ruled out, especially in the overnight periods. Breezes likely will lull from late morning into the late afternoon across the Gulf/Bayside waters due to the heating of South Florida. As the high moves farther eastward and slowly weakens, easterly breezes will slacken Thursday through Sunday. A new high pressure will slide eastward Sunday night into Monday, allowing for another round of freshening breezes.

The Approximate Shoreward Edge of the Gulf Stream as of April 10...

16 NM South of Dry Tortugas Light...on Loggerhead Key. 21 NM South of Cosgrove Shoal Light...off the Marquesas Keys. 23 NM South of Sand Key Light...off Key West. 37 NM South of Looe Key...off Big Pine Key. 29 NM Southeast of Sombrero Key Light...off Marathon. 18 NM Southeast of Alligator Reef Light...off Islamorada. 13 NM Southeast of Molasses Reef Light...off Key Largo. 9 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.

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GMZ031-160245
Florida Bay including Barnes Sound, Blackwater Sound, and Buttonwood Sound
1031 AM EDT Wed Apr 15 2026

THIS AFTERNOON
East winds near 15 knots. Bay waters a moderate chop.

TONIGHT
Northeast to east winds near 15 knots. Bay waters a moderate chop.

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

THURSDAY NIGHT
Northeast to east winds near 15 knots, decreasing to 10 to 15 knots. Bay waters a moderate chop, becoming a light to moderate chop.

FRIDAY
Northeast to east winds 10 to 15 knots. Bay waters a light to moderate chop.

FRIDAY NIGHT
Northeast to east winds 10 to 15 knots. Bay waters a light to moderate chop. A slight chance of showers.

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

SATURDAY NIGHT
East winds 10 to 15 knots, decreasing to near 10 knots. Bay waters a light to moderate chop, becoming a light chop.

SUNDAY
East winds 5 to 10 knots, becoming variable near 5 knots. Bay waters smooth to a light chop, becoming smooth.

SUNDAY NIGHT
North to northeast 5 to 10 knots, increasing to near 10 knots. Bay waters smooth to a light chop, becoming a light chop.

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GMZ032-035-160245
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
1031 AM EDT Wed Apr 15 2026

THIS AFTERNOON
East winds near 15 knots. Seas 1 to 2 feet, except 2 to 3 feet west of the Marquesas Keys. Nearshore waters a moderate chop.

TONIGHT
Northeast to east winds near 15 knots. Seas 1 to 2 feet, except 2 to 3 feet west of the Marquesas Keys. Nearshore waters a moderate chop.

THURSDAY
East winds 10 to 15 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 light to moderate chop.

THURSDAY NIGHT
Northeast to east winds 10 to 15 knots. Seas around 1 foot, except 1 to 2 feet west of the Marquesas Keys. Nearshore waters a light to moderate chop.

FRIDAY
Northeast to east winds 10 to 15 knots, briefly decreasing to near 10 knots. Seas around 1 foot, except 1 to 2 feet west of the Marquesas Keys. Nearshore waters a light to moderate chop, becoming a light chop.

FRIDAY NIGHT
Northeast to east winds 10 to 15 knots. Seas around 1 foot, except 1 to 2 feet west of the Marquesas Keys. Nearshore waters a light to moderate chop. A slight chance of showers.

SATURDAY
East winds near 10 knots. Seas around 1 foot. Nearshore waters a light chop.

SATURDAY NIGHT
East winds 10 to 15 knots, decreasing to near 10 knots. Seas around 1 foot. Nearshore waters a light to moderate chop, becoming a light chop.

SUNDAY
East winds 5 to 10 knots, becoming variable near 5 knots. Seas 1 foot or less. Nearshore waters smooth to a light chop, becoming smooth.

SUNDAY NIGHT
North to northeast winds 5 to 10 knots, increasing to near 10 knots. Seas 1 foot or less, building to around 1 foot, except building to 1 to 2 feet west of the Marquesas Keys. Nearshore waters smooth to a light chop, becoming a light chop.

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GMZ042>044-160245
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
1031 AM EDT Wed Apr 15 2026

THIS AFTERNOON
East winds near 15 knots. Seas 2 to 3 feet. Nearshore waters a moderate chop.

TONIGHT
Northeast to east winds near 15 knots. Seas 2 to 3 feet. Nearshore waters a moderate chop.

THURSDAY
Northeast to east winds near 15 knots, decreasing to 10 to 15 knots. Seas 2 to 3 feet. Nearshore waters a moderate chop, becoming a light to moderate chop.

THURSDAY NIGHT
Northeast to east winds near 15 knots, decreasing to 10 to 15 knots. Seas around 2 feet. Nearshore waters a moderate chop, becoming a light to moderate chop. A slight chance of showers.

FRIDAY
Northeast to east winds 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate chop. A slight chance of showers.

FRIDAY NIGHT
Northeast to east winds 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate chop. A slight chance of showers.

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

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

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

SUNDAY NIGHT
North to northeast winds 5 to 10 knots, increasing to near 10 knots. Seas around 1 foot, except building to 1 to 2 feet west of Cosgrove Shoal Light. Nearshore waters smooth to a light chop, becoming a light chop.

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GMZ052>055-072>075-160245
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
1031 AM EDT Wed Apr 15 2026

THIS AFTERNOON
Northeast to east winds near 15 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 6 seconds.

TONIGHT
Northeast to east winds 15 to 20 knots, decreasing to near 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast to east 4 feet at 5 seconds.

THURSDAY
Northeast to east winds near 15 knots, decreasing to 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 5 seconds.

THURSDAY NIGHT
Northeast to east winds near 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. A slight chance of showers.

FRIDAY
Northeast to east winds 10 to 15 knots. Seas 2 to 3 feet. A slight chance of showers.

FRIDAY NIGHT
Northeast to east winds near 15 knots, decreasing to 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. A slight chance of showers.

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

SATURDAY NIGHT
East winds 10 to 15 knots. Seas 2 to 3 feet.

SUNDAY
East winds near 10 knots, decreasing to 5 to 10 knots. Seas 2 to 3 feet, subsiding to 1 to 2 feet.

SUNDAY NIGHT
Northeast winds 5 to 10 knots, increasing to 10 to 15 knots. Seas 1 to 2 feet, building to 1 to 3 feet.

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GMZ033-034-160245
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
1031 AM EDT Wed Apr 15 2026

THIS AFTERNOON
East winds 10 to 15 knots. Seas 2 to 3 feet. Wave Detail: East 3 feet at 5 seconds.

TONIGHT
East winds 10 to 15 knots. Seas 2 to 3 feet. Wave Detail: East 3 feet at 4 seconds.

THURSDAY
East winds 10 to 15 knots, becoming northeast to east 5 to 10 knots in the afternoon. Seas 2 to 3 feet, subsiding to 1 to 2 feet. Wave Detail: East 3 feet at 4 seconds.

THURSDAY NIGHT
Northeast to east winds 5 to 10 knots, increasing to 10 to 15 knots. Seas 1 to 2 feet.

FRIDAY
Northeast winds near 10 knots, decreasing to 5 to 10 knots. Seas 1 to 2 feet, subsiding to around 1 foot.

FRIDAY NIGHT
Northeast to east winds 5 to 10 knots, increasing to 10 to 15 knots. Seas building to 1 to 2 feet.

SATURDAY
East winds near 10 knots, decreasing to 5 to 10 knots. Seas 1 to 2 feet.

SATURDAY NIGHT
East winds 5 to 10 knots. Seas around 1 foot.

SUNDAY
East winds 5 to 10 knots, becoming north to northeast in the afternoon. Seas around 1 foot.

SUNDAY NIGHT
Northwest to north winds 5 to 10 knots, becoming north to northeast 10 to 15 knots. Seas building to 2 to 3 feet.