National Weather Service Marine Forecast FZUS52 KKEY

FZUS52 KKEY 112123
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
423 PM EST Sun Jan 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.

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.

GMZ005-120930
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas 423 PM EST Sun Jan 11 2026

SYNOPSIS
Northerly breezes will pick up this evening ahead of an incoming cold front overnight into tomorrow. As the front passes through, expect a brief surge in fresh to possibly occasionally strong northerly breezes. A relatively weak high pressure will slide into the Southeast U.S. and allow breezes to slacken back to gentle to moderate by Tuesday. Thereafter, a pre
frontal trough will slide across the region on Wednesday, briefly clocking winds around to the southeast initially, then southwest, and eventually west to northwest. This will be followed by a second, stronger cold front early Thursday with another round of fresh to potentially strong breezes.

The Approximate Shoreward Edge of the Gulf Stream as of January 06...

17 NM South of Dry Tortugas Light...on Loggerhead Key. 11 NM South of Cosgrove Shoal Light...off the Marquesas Keys. 11 NM South of Sand Key Light...off Key West. 16 NM South of Looe Key...off Big Pine Key. 15 NM Southeast of Sombrero Key Light...off Marathon. 12 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.

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GMZ031-120930
Florida Bay including Barnes Sound, Blackwater Sound, and Buttonwood Sound
423 PM EST Sun Jan 11 2026

SMALL CRAFT SHOULD EXERCISE CAUTION FOR INCREASING WINDS

SMALL CRAFT ADVISORY WILL LIKELY BE REQUIRED OVERNIGHT

TONIGHT
North to northeast winds near 10 knots, increasing to 15 to 20 knots after midnight. Bay waters a light chop, becoming choppy. Scattered showers.

MONDAY
Northeast winds near 20 knots, decreasing to 15 to 20 knots. Bay waters rough, becoming choppy. Scattered showers.

MONDAY NIGHT
Northeast winds near 15 knots, decreasing to 10 to 15 knots. Bay waters a moderate chop, becoming a light to moderate chop. Isolated showers.

TUESDAY
Northeast to east winds 10 to 15 knots. Bay waters a light to moderate chop. Scattered showers.

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

WEDNESDAY
East to southeast winds 5 to 10 knots, becoming south to southwest. Bay waters smooth to a light chop. Scattered showers and isolated thunderstorms.

WEDNESDAY NIGHT
West to northwest winds near 10 knots, increasing to 10 to 15 knots. Bay waters a light chop, becoming a light to moderate chop. Scattered showers and isolated thunderstorms.

THURSDAY
West to northwest winds near 15 knots, increasing to 20 to 25 knots. Bay waters a moderate chop, becoming very rough. Scattered showers.

THURSDAY NIGHT
Northwest to north winds near 20 knots. Bay waters rough. Isolated showers.

FRIDAY
North winds decreasing to near 15 knots, becoming north to northeast. Bay waters becoming a moderate chop.

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

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GMZ032-035-120930
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
423 PM EST Sun Jan 11 2026

SMALL CRAFT SHOULD EXERCISE CAUTION FOR INCREASING WINDS

SMALL CRAFT ADVISORY WILL LIKELY BE REQUIRED OVERNIGHT

TONIGHT
Northwest to north winds 10 to 15 knots, becoming north to northeast 15 to 20 knots after midnight. Seas 1 to 2 feet, building to 2 to 3 feet, except building to 3 to 4 feet, occasionally to 5 feet west of the Marquesas Keys. Nearshore waters a light to moderate chop, becoming choppy. Isolated showers.

MONDAY
Northeast winds near 20 knots, decreasing to 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet, except 4 to 6 feet, occasionally to 8 feet west of the Marquesas Keys. Nearshore waters rough, becoming choppy. Isolated showers.

MONDAY NIGHT
Northeast winds near 15 knots, decreasing to 10 to 15 knots. Seas 2 to 3 feet, except 3 to 4 feet, occasionally to 5 feet west of the Marquesas Keys. Nearshore waters a moderate chop, becoming a light to moderate chop. Isolated showers.

TUESDAY
Northeast to east winds 10 to 15 knots. Seas subsiding to 1 to 2 feet. West of the Marquesas Keys, seas 2 to 3 feet. Nearshore waters a light to moderate chop. Isolated showers.

TUESDAY NIGHT
East winds 10 to 15 knots, decreasing to near 10 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate chop, becoming a light chop. Isolated showers.

WEDNESDAY
East winds near 10 knots, becoming west to northwest. Seas around 1 foot. Nearshore waters a light chop. Scattered showers and isolated thunderstorms.

WEDNESDAY NIGHT
Northwest to north winds near 10 knots, becoming west to northwest near 15 knots. Seas around 1 foot, building to 1 to 2 feet, except 2 to 3 feet west of the Marquesas Keys. Nearshore waters a light chop, becoming a moderate chop. Scattered showers and isolated thunderstorms.

THURSDAY
West to northwest winds 15 to 20 knots, becoming northwest 20 to 25 knots. Seas 1 to 2 feet, building to 3 to 4 feet, occasionally to 5 feet. West of the Marquesas Keys, seas 2 to 3 feet, building to 4 to 6 feet, occasionally to 8 feet. Nearshore waters choppy, becoming very rough. Scattered showers.

THURSDAY NIGHT
Northwest to north winds 20 to 25 knots, decreasing to near 20 knots. Seas 3 to 5 feet, occasionally to 6 feet, except 6 to 9 feet, occasionally to 11 feet west of the Marquesas Keys. Nearshore waters very rough, becoming rough. Isolated showers.

FRIDAY
North to northeast winds decreasing to 10 to 15 knots. Seas 3 to 5 feet, occasionally to 6 feet, except 5 to 7 feet, occasionally to 9 feet west of the Marquesas Keys. Nearshore waters becoming a light to moderate chop.

FRIDAY NIGHT
Northeast winds 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet, except around 4 feet, occasionally to 5 feet west of the Marquesas Keys. Nearshore waters a light to moderate chop.

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GMZ042>044-120930
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
423 PM EST Sun Jan 11 2026

SMALL CRAFT SHOULD EXERCISE CAUTION FOR INCREASING WINDS

SMALL CRAFT ADVISORY WILL LIKELY BE REQUIRED OVERNIGHT

TONIGHT
North to northeast winds 10 to 15 knots, increasing to 15 to 20 knots after midnight. Seas 1 to 2 feet, building to around 2 feet. West of Cosgrove Shoal Light, seas 1 to 2 feet, building to 3 to 4 feet, occasionally to 5 feet. Nearshore waters a light to moderate chop, becoming choppy. Scattered showers.

MONDAY
Northeast winds near 20 knots, decreasing to 15 to 20 knots. Seas 2 to 3 feet, except 3 to 5 feet, occasionally to 6 feet west of Cosgrove Shoal Light. Nearshore waters rough, becoming choppy. Scattered showers.

MONDAY NIGHT
Northeast winds near 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Nearshore waters a moderate chop. Scattered showers.

TUESDAY
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. Scattered showers.

TUESDAY NIGHT
East winds 10 to 15 knots. Seas around 2 feet. Nearshore waters a light to moderate chop. Isolated showers.

WEDNESDAY
East to southeast winds near 10 knots, becoming southwest to west in the afternoon. Seas 1 to 2 feet. Nearshore waters a light chop. Scattered showers and isolated thunderstorms.

WEDNESDAY NIGHT
West to northwest winds near 10 knots, becoming west to northwest near 15 knots. Seas around 1 foot, except building to 1 to 2 feet west of Cosgrove Shoal Light. Nearshore waters a light chop, becoming a moderate chop. Scattered showers and isolated thunderstorms.

THURSDAY
West winds 15 to 20 knots, becoming northwest 20 to 25 knots. Seas 1 to 2 feet, building to 2 to 3 feet. West of Cosgrove Shoal Light, seas 2 to 3 feet, building to 4 to 5 feet, occasionally to 6 feet. Nearshore waters choppy, becoming very rough. Scattered showers.

THURSDAY NIGHT
Northwest to north winds 20 to 25 knots, decreasing to near 20 knots. Seas 2 to 4 feet, occasionally to 5 feet, except 5 to 7 feet, occasionally to 9 feet west of Cosgrove Shoal Light. Nearshore waters very rough, becoming rough. Isolated showers.

FRIDAY
North winds 15 to 20 knots, becoming north to northeast 10 to 15 knots in the afternoon. Seas 2 to 4 feet, occasionally to 5 feet. West of Cosgrove Shoal Light, seas 5 to 7 feet, occasionally to 9 feet, subsiding to 4 to 5 feet, occasionally to 6 feet in the afternoon. Nearshore waters choppy, becoming a light to moderate chop.

FRIDAY NIGHT
Northeast winds 10 to 15 knots. Seas 2 to 3 feet, except around 4 feet, occasionally to 5 feet west of Cosgrove Shoal Light. Nearshore waters a light to moderate chop.

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GMZ052>055-072>075-120930
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
423 PM EST Sun Jan 11 2026

SMALL CRAFT SHOULD EXERCISE CAUTION FOR INCREASING WINDS

SMALL CRAFT ADVISORY WILL LIKELY BE REQUIRED OVERNIGHT

TONIGHT
Northeast winds 10 to 15 knots, increasing to 15 to 20 knots after midnight. Seas 2 to 3 feet, building to 3 to 6 feet, occasionally to 8 feet. Wave Detail: Northeast 4 feet at 5 seconds. Scattered showers and isolated thunderstorms.

MONDAY
Northeast winds near 20 knots, decreasing to 15 to 20 knots. Seas 5 to 7 feet, occasionally to 9 feet. Wave Detail: North 5 feet at 7 seconds. Scattered showers and isolated thunderstorms.

MONDAY NIGHT
Northeast winds 15 to 20 knots, decreasing to near 15 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: Northeast 5 feet at 6 seconds and west to northwest 3 feet at 8 seconds. Scattered showers and isolated thunderstorms.

TUESDAY
Northeast to east winds near 15 knots. Seas 3 to 5 feet, occasionally to 6 feet. Scattered showers and isolated thunderstorms.

TUESDAY NIGHT
Northeast to east winds 10 to 15 knots, becoming east to southeast. Seas 3 to 4 feet, occasionally to 5 feet. Isolated showers and thunderstorms.

WEDNESDAY
Southeast winds near 10 knots, becoming southwest. Seas 2 to 3 feet. Scattered showers and isolated thunderstorms.

WEDNESDAY NIGHT
West to northwest winds near 10 knots, increasing to near 15 knots. Seas around 2 feet, building to 2 to 3 feet. Scattered showers and isolated thunderstorms.

THURSDAY
West winds 15 to 20 knots, becoming west to northwest 20 to 25 knots. Seas 2 to 4 feet, building to 4 to 6 feet, occasionally to 8 feet. Scattered showers and isolated thunderstorms.

THURSDAY NIGHT
Northwest to north winds 20 to 25 knots. Seas 5 to 8 feet, occasionally to 10 feet. Isolated showers.

FRIDAY
North to northeast winds decreasing to 15 to 20 knots. Seas 5 to 7 feet, occasionally to 9 feet.

FRIDAY NIGHT
Northeast winds near 15 knots. Seas 3 to 5 feet, occasionally to 6 feet. Isolated showers.

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GMZ033-034-120930
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
423 PM EST Sun Jan 11 2026

SMALL CRAFT ADVISORY IN EFFECT

TONIGHT
North winds 10 to 15 knots, becoming north to northeast 20 to 25 knots. Seas 2 to 3 feet, building to 4 to 6 feet, occasionally to 8 feet. Wave Detail: North 3 feet at 3 seconds, becoming north 4 feet at 5 seconds. Isolated showers.

MONDAY
Northeast winds near 20 knots, becoming north to northeast 10 to 15 knots in the afternoon. Seas 4 to 7 feet, occasionally to 9 feet, subsiding to 3 to 5 feet, occasionally to 6 feet. Wave Detail: North to northeast 5 feet at 5 seconds and northwest 4 feet at 8 seconds. Isolated showers.

MONDAY NIGHT
Northeast winds increasing to near 15 knots. Seas 3 to 5 feet, occasionally to 6 feet, subsiding to 2 to 4 feet, occasionally to 5 feet. Wave Detail: Northwest to north 4 feet at 8 seconds and northeast 2 feet at 4 seconds. Isolated showers.

TUESDAY
Northeast winds near 15 knots, decreasing to 10 to 15 knots. Seas 2 to 3 feet. Isolated showers.

TUESDAY NIGHT
Northeast to east winds near 10 knots. Seas subsiding to 1 to 2 feet. Scattered showers and isolated thunderstorms.

WEDNESDAY
North to northeast winds near 10 knots, becoming northwest to north. Seas 1 to 2 feet. Scattered showers and isolated thunderstorms.

WEDNESDAY NIGHT
Northwest to north winds near 10 knots, becoming west to northwest near 15 knots. Seas 1 to 2 feet, building to 2 to 3 feet. Scattered showers and isolated thunderstorms.

THURSDAY
West to northwest winds 15 to 20 knots, becoming northwest 20 to 25 knots. Seas 3 to 4 feet, occasionally to 5 feet, building to 5 to 8 feet, occasionally to 10 feet. Scattered showers and isolated thunderstorms.

THURSDAY NIGHT
Northwest to north winds 20 to 25 knots, decreasing to near 20 knots. Seas 6 to 9 feet, occasionally to 11 feet. Isolated showers.

FRIDAY
North to northeast winds 15 to 20 knots, becoming 10 to 15 knots in the afternoon. Seas 5 to 7 feet, occasionally to 9 feet.

FRIDAY NIGHT
Northeast to east winds near 15 knots. Seas 3 to 5 feet, occasionally to 6 feet.