


Coastal Waters Forecast
Issued by NWS Key West, FL
Issued by NWS Key West, FL
511 FZUS52 KKEY 170817 CWFKEY Coastal Waters Forecast for the Florida Keys National Weather Service Key West FL 417 AM EDT Fri Oct 17 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. GMZ005-172030- Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas 417 AM EDT Fri Oct 17 2025 .SYNOPSIS...A high pressure system moving towards the southeastern CONUS form the Great Lakes will support breezes freshening to moderate to fresh today and tonight. Small Craft Advisories may be required as breezes are expected to be just below the threshold. Shower coverage will rise today as the wind surge moves south across the Florida Keys coastal waters. Environmental conditions will become more supportive of showers and thunderstorms on Sunday and Monday. The Approximate Shoreward Edge of the Gulf Stream as of October 15... 63 NM South of Dry Tortugas Light...on Loggerhead Key. 42 NM South of Cosgrove Shoal Light...off the Marquesas Keys. 33 NM South of Sand Key Light...off Key West. 23 NM South of Looe Key...off Big Pine Key. 16 NM Southeast of Sombrero Key Light...off Marathon. 22 NM Southeast of Alligator Reef Light...off Islamorada. 20 NM Southeast of Molasses Reef Light...off Key Largo. 18 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. $$ GMZ031-172030- Florida Bay including Barnes Sound, Blackwater Sound, and Buttonwood Sound- 417 AM EDT Fri Oct 17 2025 ...SMALL CRAFT SHOULD EXERCISE CAUTION FOR INCREASING WINDS... .TODAY...Northeast to east winds near 15 knots, increasing to 15 to 20 knots. Bay waters a moderate chop, becoming choppy. Isolated showers. .TONIGHT AND SATURDAY...Northeast to east winds 15 to 20 knots. Bay waters choppy. .SATURDAY NIGHT...East winds near 15 knots. Bay waters a moderate chop. Isolated showers. .SUNDAY...East winds 10 to 15 knots. Bay waters a light to moderate chop. Isolated showers and thunderstorms. .SUNDAY NIGHT...East winds 10 to 15 knots. Bay waters a light to moderate chop. Scattered showers and isolated thunderstorms. .MONDAY...East winds 10 to 15 knots, increasing to near 15 knots. Bay waters a light to moderate chop, becoming a moderate chop. Isolated showers and thunderstorms. .MONDAY NIGHT...Northeast to east winds near 15 knots. Bay waters a moderate chop. Isolated showers and thunderstorms. .TUESDAY AND TUESDAY NIGHT...Northeast to east winds 10 to 15 knots. Bay waters a light to moderate chop. Isolated showers. $$ GMZ032-035-172030- 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- 417 AM EDT Fri Oct 17 2025 ...SMALL CRAFT SHOULD EXERCISE CAUTION... ...SMALL CRAFT ADVISORY MAY BE REQUIRED TODAY... .TODAY...Northeast to east 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. Isolated showers. .TONIGHT AND SATURDAY...Northeast to east 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. Isolated showers. .SATURDAY NIGHT...East 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. Isolated showers. .SUNDAY...East winds near 15 knots, decreasing to 10 to 15 knots. Seas subsiding to 1 to 2 feet. Nearshore waters a moderate chop, becoming a light to moderate chop. Scattered showers and isolated thunderstorms. .SUNDAY NIGHT...East winds 10 to 15 knots. Seas 1 to 2 foot. Nearshore waters a light to moderate chop. Scattered showers and isolated thunderstorms. .MONDAY...East winds 10 to 15 knots, increasing to near 15 knots. Seas 1 to 2 feet, building to 1 to 3 feet. Nearshore waters a light to moderate chop, becoming a moderate chop. Isolated showers and thunderstorms. .MONDAY NIGHT...East winds near 15 knots. Seas 1 to 3 feet. Nearshore waters a moderate chop. Isolated showers and thunderstorms. .TUESDAY AND TUESDAY NIGHT...Northeast to east winds 10 to 15 knots. Seas 1 to 2 feet, except 2 to 3 feet west of the Marquesas Keys. Nearshore waters a light to moderate chop. Isolated showers. $$ GMZ042>044-172030- Hawk Channel from Ocean Reef to Craig Key out to the reef- Hawk Channel from Craig Key to west end of Seven Mile Bridge out to the reef- Hawk Channel from west end of Seven Mile Bridge to Halfmoon Shoal out to the reef- 417 AM EDT Fri Oct 17 2025 ...SMALL CRAFT SHOULD EXERCISE CAUTION... ...SMALL CRAFT ADVISORY MAY BE REQUIRED TODAY... .TODAY...Northeast to east winds 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. Nearshore waters choppy. Scattered showers. .TONIGHT...Northeast to east winds 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. Nearshore waters choppy. Isolated showers. .SATURDAY AND SATURDAY NIGHT...East winds 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. Nearshore waters choppy. Isolated showers. .SUNDAY...East winds near 15 knots, decreasing to 10 to 15 knots. Seas 2 to 3 feet. Nearshore waters a moderate chop, becoming a light to moderate chop. Scattered showers and isolated thunderstorms. .SUNDAY NIGHT...East winds 10 to 15 knots. Seas 1 to 3 feet. Nearshore waters a light to moderate chop. Scattered showers and isolated thunderstorms. .MONDAY...Northeast to east winds 10 to 15 knots, increasing to near 15 knots. Seas building to 2 to 3 feet. Nearshore waters a light to moderate chop, becoming a moderate chop. Scattered showers and isolated thunderstorms. .MONDAY NIGHT...East winds near 15 knots. Seas 2 to 3 feet. Nearshore waters a moderate chop. Scattered showers and isolated thunderstorms. .TUESDAY AND TUESDAY NIGHT...Northeast to east winds 10 to 15 knots. Seas 1 to 3 feet. Nearshore waters a light to moderate chop. Isolated showers. $$ GMZ052>055-072>075-172030- 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- 417 AM EDT Fri Oct 17 2025 ...SMALL CRAFT SHOULD EXERCISE CAUTION... ...SMALL CRAFT ADVISORY MAY BE REQUIRED TODAY... .TODAY...Northeast to east winds 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: Northeast to east 5 feet at 6 seconds. Scattered showers. .TONIGHT...Northeast to east winds 15 to 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: Northeast to east 5 feet at 6 seconds. Scattered showers. .SATURDAY...East winds 15 to 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: Northeast to east 5 feet at 6 seconds. Scattered showers. .SATURDAY NIGHT...East winds 15 to 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. Scattered showers. .SUNDAY...East winds near 15 knots, decreasing to 10 to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers and isolated thunderstorms. .SUNDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 4 feet. Scattered showers and isolated thunderstorms. .MONDAY...Northeast to east winds near 15 knots, increasing to 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. Scattered showers and isolated thunderstorms. .MONDAY NIGHT...Northeast to east winds 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Scattered showers and isolated thunderstorms. .TUESDAY...Northeast to east winds near 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers. .TUESDAY NIGHT...Northeast to east winds near 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. Isolated showers. $$ GMZ033-034-172030- Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM out and beyond 5 fathoms- Gulf of America including Dry Tortugas and Rebecca Shoal Channel- 417 AM EDT Fri Oct 17 2025 ...SMALL CRAFT SHOULD EXERCISE CAUTION... ...SMALL CRAFT ADVISORY MAY BE REQUIRED TODAY... .TODAY...Northeast to east winds 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast to east 3 feet at 4 seconds. Isolated showers. .TONIGHT AND SATURDAY...East winds 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: Northeast to east 4 feet at 5 seconds. Isolated showers. .SATURDAY NIGHT...East winds 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Isolated showers. .SUNDAY...East winds near 15 knots, decreasing to 10 to 15 knots. Seas subsiding to 2 to 3 feet. Scattered showers and isolated thunderstorms. .SUNDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 3 feet. Isolated showers and thunderstorms. .MONDAY...Northeast to east winds 10 to 15 knots. Seas 2 to 3 feet. Isolated showers and thunderstorms. .MONDAY NIGHT...Northeast to east winds near 15 knots. Seas 2 to 4 feet. Isolated showers and thunderstorms. .TUESDAY AND TUESDAY NIGHT...Northeast to east winds 10 to 15 knots. Seas 2 to 3 feet. Isolated showers. $$ AJP