National Weather Service Marine Forecast FZUS52 KKEY

FZUS52 KKEY 041428
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
1028 AM EDT Fri Apr 4 2025

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.

GMZ005-042030
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas 1028 AM EDT Fri Apr 4 2025

SYNOPSIS
A pronounced high pressure system over the North Atlantic continues to sustain fresh to strong east to southeasterly breezes across the Florida Keys waters. Breezes will begin to slacken Sunday morning as a low pressure system deepens over the eastern United States. Shower chances will stay near nil until next week when a frontal passage may occur sometime around Tuesday to Wednesday. Lightning probabilities are absent from the forecast at this time due to the uncertain strength of the potential front.

The Approximate Shoreward Edge of the Gulf Stream as of March 31...

18 NM South of Dry Tortugas Light...on Loggerhead Key. 1 NM South of Cosgrove Shoal Light...off the Marquesas Keys. 1 NM South of Sand Key Light...off Key West. 6 NM South of Looe Key...off Big Pine Key. 10 NM South of Sombrero Key Light...off Marathon. 6 NM Southeast of Alligator Reef Light...off Islamorada. 5 NM Southeast of Molasses Reef Light...off Key Largo. 3 NM East 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.

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GMZ031-042030
Florida Bay including Barnes Sound, Blackwater Sound, and Buttonwood Sound
1028 AM EDT Fri Apr 4 2025

SMALL CRAFT ADVISORY IN EFFECT

THIS AFTERNOON
East to southeast winds near 20 knots. Bay waters rough.

TONIGHT AND SATURDAY
East to southeast winds 20 to 25 knots. Bay waters very rough.

SATURDAY NIGHT
East to southeast winds near 20 knots, decreasing to 15 to 20 knots. Bay waters rough, becoming choppy.

SUNDAY
Southeast winds 15 to 20 knots, decreasing to 10 to 15 knots. Bay waters choppy, becoming a light to moderate chop.

SUNDAY NIGHT
Southeast winds 10 to 15 knots. Bay waters a light to moderate chop. Isolated showers.

MONDAY
Southeast to south winds 10 to 15 knots. Bay waters a light to moderate chop. Isolated showers.

MONDAY NIGHT
South winds 5 to 10 knots. Bay waters smooth to a light chop. Scattered showers.

TUESDAY
Southwest to west winds near 10 knots. Bay waters a light chop. Scattered showers.

TUESDAY NIGHT
Northwest to north winds 10 to 15 knots. Bay waters a light to moderate chop. Scattered showers.

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GMZ032-035-042030
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
1028 AM EDT Fri Apr 4 2025

SMALL CRAFT ADVISORY IN EFFECT

THIS AFTERNOON
East to southeast winds near 20 knots, increasing to 20 to 25 knots. Seas 2 to 3 feet, except 4 to 5 feet, occasionally to 6 feet west of the Marquesas Keys. Nearshore waters rough, becoming very rough.

TONIGHT AND SATURDAY
East to southeast winds 20 to 25 knots. Seas 2 to 3 feet, except 4 to 5 feet, occasionally to 6 feet west of the Marquesas Keys. Nearshore waters very rough.

SATURDAY NIGHT
East to southeast winds 20 to 25 knots, decreasing to near 20 knots. Seas 2 to 3 feet, except 4 to 5 feet, occasionally to 6 feet west of the Marquesas Keys. Nearshore waters very rough, becoming rough.

SUNDAY
Southeast 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 the Marquesas Keys. Nearshore waters rough, becoming choppy.

SUNDAY NIGHT
Southeast winds near 15 knots, decreasing to 10 to 15 knots. Seas 1 to 2 feet, except 2 to 3 feet west of the Marquesas Keys. Nearshore waters a moderate chop, becoming a light to moderate chop. Isolated showers.

MONDAY
Southeast to south winds 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate chop. Isolated showers.

MONDAY NIGHT
Southeast to south winds near 10 knots, becoming south to southwest and decreasing to 5 to 10 knots. Seas 1 to 2 feet. Nearshore waters a light chop, becoming a smooth to a light chop. Scattered showers.

TUESDAY
West winds 5 to 10 knots, becoming west to northwest and increasing to 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters smooth to a light chop, becoming a light to moderate chop. Scattered showers.

TUESDAY NIGHT
Northwest to north winds 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 light to moderate chop. Scattered showers.

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GMZ042>044-042030
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
1028 AM EDT Fri Apr 4 2025

SMALL CRAFT ADVISORY IN EFFECT

THIS AFTERNOON
East to southeast winds near 20 knots, increasing to 20 to 25 knots. Seas 5 to 7 feet, occasionally to 8 feet. Nearshore waters rough, becoming very rough.

TONIGHT AND SATURDAY
East to southeast winds 20 to 25 knots. Seas 5 to 7 feet, occasionally to 8 feet. Nearshore waters very rough.

SATURDAY NIGHT
East to southeast winds near 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Nearshore waters rough.

SUNDAY
Southeast winds near 20 knots, decreasing to 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Nearshore waters rough, becoming choppy.

SUNDAY NIGHT
Southeast winds near 15 knots. Seas 2 to 3 feet. Nearshore waters a moderate chop. Isolated showers.

MONDAY
Southeast to south winds 10 to 15 knots, decreasing to near 10 knots. Seas 2 to 3 feet. Nearshore waters a light to moderate chop, becoming a light chop. Isolated showers.

MONDAY NIGHT
South winds 5 to 10 knots, becoming south to southwest. Seas 1 to 2 feet. Nearshore waters smooth to a light chop. Scattered showers.

TUESDAY
West winds 5 to 10 knots, becoming west to northwest and increasing to 10 to 15 knots. Seas 1 to 2 feet, except 2 to 3 feet west of Cosgrove Shoal Light. Nearshore waters smooth to a light chop, becoming a light to moderate chop. Scattered showers.

TUESDAY NIGHT
Northwest to north winds 10 to 15 knots. Seas 2 to 3 feet, except 3 to 4 feet, occasionally to 5 feet west of Cosgrove Shoal Light. Nearshore waters a light to moderate chop. Scattered showers.

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GMZ052>055-072>075-042030
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
1028 AM EDT Fri Apr 4 2025

SMALL CRAFT ADVISORY IN EFFECT

THIS AFTERNOON
East to southeast winds 20 to 25 knots. Seas 5 to 8 feet, occasionally to 10 feet. Wave Detail: East to southeast 7 feet at 7 seconds.

TONIGHT
East to southeast winds 20 to 25 knots. Seas 5 to 8 feet, occasionally to 10 feet. Wave Detail: East 8 feet at 7 seconds.

SATURDAY
East to southeast winds 20 to 25 knots. Seas 5 to 8 feet, occasionally to 10 feet. Wave Detail: East to southeast 7 feet at 7 seconds.

SATURDAY NIGHT
East to southeast winds 20 to 25 knots. Seas 5 to 8 feet, occasionally to 10 feet.

SUNDAY
Southeast winds near 20 knots, decreasing to 15 to 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. Isolated showers.

SUNDAY NIGHT
Southeast winds near 15 knots, decreasing to 10 to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. Isolated showers.

MONDAY
Southeast to south winds 10 to 15 knots. Seas 2 to 3 feet. Isolated showers.

MONDAY NIGHT
Southeast to south winds 5 to 10 knots, becoming south to southwest and increasing to near 10 knots. Seas 2 to 3 feet. Scattered showers.

TUESDAY AND TUESDAY NIGHT
Southwest to west winds 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Scattered showers.

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GMZ033-034-042030
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
1028 AM EDT Fri Apr 4 2025

SMALL CRAFT ADVISORY IN EFFECT

THIS AFTERNOON
East to southeast winds near 20 knots, increasing to 20 to 25 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: East to southeast 5 feet at 5 seconds.

TONIGHT
East to southeast winds 20 to 25 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: East to southeast 5 feet at 5 seconds.

SATURDAY
East to southeast winds near 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: Southeast 5 feet at 5 seconds.

SATURDAY NIGHT
East to southeast winds near 20 knots. Seas 4 to 6 feet, occasionally to 8 feet.

SUNDAY
Southeast winds near 20 knots, decreasing to 15 to 20 knots. Seas subsiding to 3 to 5 feet, occasionally to 6 feet.

SUNDAY NIGHT
Southeast winds near 15 knots, decreasing to 10 to 15 knots. Seas 2 to 3 feet. Isolated showers.

MONDAY
South winds 10 to 15 knots, decreasing to near 10 knots. Seas around 2 feet. Isolated showers.

MONDAY NIGHT
Southwest winds 5 to 10 knots. Seas 1 to 2 feet. Scattered showers.

TUESDAY
West to northwest winds 5 to 10 knots, becoming northwest to north and increasing to near 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Scattered showers.

TUESDAY NIGHT
Northwest to north winds 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Isolated showers.

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JAM/AP