Coastal Waters Forecast
Issued by NWS Key West, FL
Issued by NWS Key West, FL
693 FZUS52 KKEY 230221 CWFKEY Coastal Waters Forecast for the Florida Keys National Weather Service Key West FL 1021 PM EDT Sun Sep 22 2024 Florida Bay, Hawk Channel and Straits of Florida from Ocean Reef to south of Dry Tortugas, and the extreme southeastern Gulf of Mexico, 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. GMZ005-230900- Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas 1021 PM EDT Sun Sep 22 2024 .SYNOPSIS...Light to gentle easterly flow across the Keys coastal waters overnight will continue to increase Monday through Tuesday, as high pressure builds along the Eastern Seaboard, and a tropical low slowly develops in the northwestern Caribbean Sea. Heading through the middle and later part of the week, the forecast will depend on the potential development and movement of this low. At this time, we expect fresh to strong east to southeast breezes to develop late Tuesday, becoming southerly late in the week, with the strongest winds over western sections of the Keys waters. Mariners should continue to closely monitor the latest forecast updates during the next several days. The Approximate Shoreward Edge of the Gulf Stream as of September 18... 63 NM South of Dry Tortugas Light...on Loggerhead Key. 23 NM South of Cosgrove Shoal Light...off the Marquesas Keys. 8 NM South of Sand Key Light...off Key West. 12 NM South of Looe Key...off Big Pine Key. 13 NM South of Sombrero Key Light...off Marathon. 6 NM Southeast of Alligator Reef Light...off Islamorada. 4 NM Southeast of Molasses Reef Light...off Key Largo. 5 NM East of Carysfort Reef Light...off Ocean Reef. Gulf Stream Information Courtesy of the National Weather Service in Key West. $$ GMZ031-230900- Florida Bay including Barnes Sound, Blackwater Sound, and Buttonwood Sound- 1021 PM EDT Sun Sep 22 2024 .OVERNIGHT...East winds 5 to 10 knots. Bay waters smooth to a light chop. Scattered showers and isolated thunderstorms. .MONDAY...East winds 5 to 10 knots. Bay waters smooth to a light chop. Isolated showers and thunderstorms. .MONDAY NIGHT...East winds near 10 knots, increasing to 10 to 15 knots. Bay waters a light chop, becoming a light to moderate chop. Scattered showers and isolated thunderstorms. .TUESDAY...East winds 10 to 15 knots. Bay waters a light to moderate chop. Scattered showers and thunderstorms. .TUESDAY NIGHT...East to southeast winds near 15 knots, increasing to 15 to 20 knots. Bay waters a moderate chop, becoming choppy. Numerous showers and scattered thunderstorms. .WEDNESDAY...Southeast winds 15 to 20 knots. Bay waters choppy. Numerous showers and scattered thunderstorms. .WEDNESDAY NIGHT AND THURSDAY...Southeast winds near 20 knots. Bay waters rough. Numerous showers and scattered thunderstorms. .THURSDAY NIGHT...South winds 15 to 20 knots. Bay waters choppy. Numerous showers and scattered thunderstorms. .FRIDAY...South to southwest winds near 15 knots. Bay waters a moderate chop. Scattered showers and thunderstorms. .FRIDAY NIGHT...South winds 10 to 15 knots. Bay waters a light to moderate chop. Scattered showers and thunderstorms. $$ GMZ032-035-230900- Bayside and Gulf side from Craig Key to west end of Seven Mile Bridge- Gulf of Mexico from west end of Seven Mile Bridge to Halfmoon Shoal out to 5 Fathoms- 1021 PM EDT Sun Sep 22 2024 .OVERNIGHT...East winds 5 to 10 knots, increasing to near 10 knots. Seas 1 foot or less. Nearshore waters smooth to a light chop, becoming a light chop. Scattered showers and isolated thunderstorms. .MONDAY...East winds near 10 knots. Seas 1 foot or less. Nearshore waters a light chop. Isolated showers and thunderstorms. .MONDAY NIGHT...East winds near 10 knots, increasing to 10 to 15 knots. Seas building to 1 to 2 feet. Nearshore waters a light chop, becoming a light to moderate chop. Scattered showers and isolated thunderstorms. .TUESDAY...East to southeast winds near 15 knots. Seas 1 to 2 feet, except 2 to 3 feet west of the Marquesas Keys. Nearshore waters a moderate chop. Scattered showers and thunderstorms. .TUESDAY NIGHT...East to southeast winds 15 to 20 knots. Seas 2 to 3 feet, except 3 to 4 feet, occasionally to 5 feet west of the Marquesas Keys. Nearshore waters choppy. Numerous showers and scattered thunderstorms. .WEDNESDAY...Southeast winds near 20 knots. Seas 2 to 3 feet, except 4 to 5 feet, occasionally to 6 feet west of the Marquesas Keys. Nearshore waters rough. Numerous showers and scattered thunderstorms. .WEDNESDAY NIGHT...Southeast to south winds 20 to 25 knots. Seas 2 to 3 feet, except 4 to 6 feet, occasionally to 8 feet west of the Marquesas Keys. Nearshore waters very rough. Numerous showers and scattered thunderstorms. .THURSDAY...Southeast to south winds 20 to 25 knots. Seas 2 to 3 feet, except 5 to 7 feet, occasionally to 9 feet west of the Marquesas Keys. Nearshore waters very rough. Numerous showers and scattered thunderstorms. .THURSDAY NIGHT...South winds near 20 knots. Seas 2 to 3 feet, except 5 to 6 feet, occasionally to 8 feet west of the Marquesas Keys. Nearshore waters rough. Numerous showers and scattered thunderstorms. .FRIDAY...South to southwest winds 15 to 20 knots. Seas 2 to 3 feet, except 4 to 5 feet, occasionally to 6 feet west of the Marquesas Keys. Nearshore waters choppy. Scattered showers and thunderstorms. .FRIDAY NIGHT...South winds near 15 knots. Seas 2 to 4 feet, occasionally to 5 feet, except 5 to 6 feet, occasionally to 8 feet west of the Marquesas Keys. Nearshore waters a moderate chop. Scattered showers and thunderstorms. $$ GMZ042>044-230900- 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- 1021 PM EDT Sun Sep 22 2024 .OVERNIGHT...East winds near 10 knots. Seas around 1 foot. Nearshore waters a light chop. Scattered showers and isolated thunderstorms. .MONDAY...East winds near 10 knots. Seas around 1 foot, building to 1 to 2 feet. Nearshore waters a light chop. Isolated showers and thunderstorms. .MONDAY NIGHT...East winds increasing to 10 to 15 knots. Seas building to 2 to 3 feet. Nearshore waters becoming a light to moderate chop. Scattered showers and isolated thunderstorms. .TUESDAY...East to southeast winds near 15 knots, increasing to 15 to 20 knots. Seas 2 to 3 feet. Nearshore waters a moderate chop, becoming choppy. Scattered showers and thunderstorms. .TUESDAY NIGHT...East to southeast winds 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. Nearshore waters choppy. Numerous showers and scattered thunderstorms. .WEDNESDAY...Southeast winds near 20 knots. Seas 3 to 5 feet, occasionally to 6 feet, except 5 to 6 feet, occasionally to 8 feet west of Cosgrove Shoal Light. Nearshore waters rough. Numerous showers and scattered thunderstorms. .WEDNESDAY NIGHT...Southeast to south winds 20 to 25 knots. Seas 4 to 6 feet, occasionally to 8 feet. Nearshore waters very rough. Numerous showers and scattered thunderstorms. .THURSDAY...Southeast to south winds 20 to 25 knots. Seas 4 to 6 feet, occasionally to 8 feet, except 6 to 7 feet, occasionally to 9 feet west of Cosgrove Shoal Light. Nearshore waters very rough. Numerous showers and scattered thunderstorms. .THURSDAY NIGHT...South winds near 20 knots. Seas 3 to 5 feet, occasionally to 6 feet, except 5 to 7 feet, occasionally to 9 feet west of Cosgrove Shoal Light. Nearshore waters rough. Numerous showers and scattered thunderstorms. .FRIDAY...South to southwest winds 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Nearshore waters choppy. Scattered showers and thunderstorms. .FRIDAY NIGHT...South winds near 15 knots. Seas 2 to 4 feet, occasionally to 5 feet, except 4 to 5 feet, occasionally to 6 feet west of Cosgrove Shoal Light. Nearshore waters a moderate chop. Scattered showers and thunderstorms. $$ GMZ052>055-072>075-230900- 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- 1021 PM EDT Sun Sep 22 2024 .OVERNIGHT...East winds near 10 knots. Seas 1 to 2 feet. Wave Detail: Northeast to east 1 foot at 3 seconds. Isolated showers and thunderstorms. .MONDAY...East winds near 10 knots. Seas 1 to 2 feet. Wave Detail: East 2 feet at 3 seconds. Isolated showers and thunderstorms. .MONDAY NIGHT...East winds 10 to 15 knots, increasing to near 15 knots. Seas building to 2 to 3 feet. Wave Detail: East 3 feet at 4 seconds. Scattered showers and isolated thunderstorms. .TUESDAY...East to southeast winds 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers and thunderstorms. .TUESDAY NIGHT...East to southeast winds 15 to 20 knots. Seas 4 to 5 feet, occasionally to 6 feet. Numerous showers and scattered thunderstorms. .WEDNESDAY...Southeast winds near 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. Numerous showers and scattered thunderstorms. .WEDNESDAY NIGHT AND THURSDAY...Southeast to south winds 20 to 25 knots. Seas 5 to 7 feet, occasionally to 9 feet. Numerous showers and scattered thunderstorms. .THURSDAY NIGHT...South winds near 20 knots. Seas 5 to 7 feet, occasionally to 9 feet. Numerous showers and scattered thunderstorms. .FRIDAY...South to southwest winds near 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Scattered showers and thunderstorms. .FRIDAY NIGHT...South winds near 15 knots. Seas 3 to 5 feet, occasionally to 6 feet. Scattered showers and thunderstorms. $$ GMZ033-034-230900- Gulf waters from East Cape Sable to Chokoloskee 20 to 60 NM out and beyond 5 fathoms- Gulf of Mexico including Dry Tortugas and Rebecca Shoal Channel- 1021 PM EDT Sun Sep 22 2024 .OVERNIGHT...Northeast to east winds 5 to 10 knots, becoming east and increasing to near 10 knots. Seas around 1 foot. Wave Detail: Northeast to east 1 foot at 2 seconds. Isolated showers and thunderstorms. .MONDAY...East winds 5 to 10 knots, increasing to near 10 knots. Seas building to around 1 foot. Wave Detail: East 1 foot at 2 seconds. Scattered showers and isolated thunderstorms. .MONDAY NIGHT...East winds 10 to 15 knots, increasing to near 15 knots. Seas building to 2 to 3 feet. Wave Detail: East to southeast 2 feet at 3 seconds. Scattered showers and isolated thunderstorms. .TUESDAY...East to southeast winds near 15 knots, increasing to 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. Scattered showers and thunderstorms. .TUESDAY NIGHT...East to southeast winds 15 to 20 knots, increasing to near 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Numerous showers and scattered thunderstorms. .WEDNESDAY...Southeast winds 20 to 25 knots. Seas 4 to 6 feet, occasionally to 8 feet. Widespread showers and scattered thunderstorms. .WEDNESDAY NIGHT...Southeast to south winds 20 to 25 knots. Seas 5 to 7 feet, occasionally to 9 feet. Widespread showers and scattered thunderstorms. .THURSDAY...Southeast to south winds near 25 knots. Seas 5 to 8 feet, occasionally to 10 feet. Widespread showers and scattered thunderstorms. .THURSDAY NIGHT...South to southwest winds 20 to 25 knots. Seas 5 to 7 feet, occasionally to 9 feet. Numerous showers and scattered thunderstorms. .FRIDAY...South to southwest winds 15 to 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. Numerous showers and scattered thunderstorms. .FRIDAY NIGHT...South winds near 15 knots. Seas 4 to 5 feet, occasionally to 6 feet. Numerous showers and scattered thunderstorms. $$