Coastal Waters Forecast
Issued by NWS Key West, FL
Issued by NWS Key West, FL
231 FZUS52 KKEY 032040 CWFKEY Coastal Waters Forecast for the Florida Keys National Weather Service Key West FL 440 PM EDT Fri Oct 3 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. GMZ005-040845- Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas 440 PM EDT Fri Oct 3 2025 .SYNOPSIS...High pressure is slowly moving across the eastern U.S., which will maintain a northeast wind across our waters. This high will build into the western North Atlantic, leading to freshening northeast to east breezes into Friday evening. Winds will then briefly clock around towards the southeast for the upcoming weekend and return from the east early next week. Another period of moderate to fresh breezes is possible starting Monday night. Expect an active weather pattern with winds and seas expected to be higher in and around thunderstorms. The Approximate Shoreward Edge of the Gulf Stream as of October 01... 42 NM South of Dry Tortugas Light...on Loggerhead Key. 33 NM South of Cosgrove Shoal Light...off the Marquesas Keys. 33 NM South of Sand Key Light...off Key West. 35 NM South of Looe Key...off Big Pine Key. 16 NM Southeast of Sombrero Key Light...off Marathon. 10 NM Southeast of Alligator Reef Light...off Islamorada. 6 NM Southeast of Molasses Reef Light...off Key Largo. 5 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. $$ GMZ031-040845- Florida Bay including Barnes Sound, Blackwater Sound, and Buttonwood Sound- 440 PM EDT Fri Oct 3 2025 ...SMALL CRAFT SHOULD EXERCISE CAUTION UNTIL WINDS DECREASE... .TONIGHT...Northeast winds 15 to 20 knots, becoming north to northeast 10 to 15 knots after midnight. Bay waters choppy, becoming a light to moderate chop. Scattered showers and isolated thunderstorms. .SATURDAY...West to northwest winds near 10 knots, becoming south to southwest in the afternoon. Bay waters a light chop. Scattered showers and isolated thunderstorms. .SATURDAY NIGHT...South winds near 10 knots. Bay waters a light chop. Scattered showers and isolated thunderstorms. .SUNDAY...South to southwest winds near 10 knots. Bay waters a light chop. Scattered showers and isolated thunderstorms. .SUNDAY NIGHT...Southeast winds near 10 knots. Bay waters a light chop. Scattered showers and isolated thunderstorms. .MONDAY...East to southeast winds near 10 knots. Bay waters a light chop. Scattered showers and isolated thunderstorms. .MONDAY NIGHT...Northeast to east winds 10 to 15 knots. Bay waters a light to moderate chop. Scattered showers and isolated thunderstorms. .TUESDAY...Northeast to east winds near 15 knots. Bay waters a moderate chop. Scattered showers and isolated thunderstorms. .TUESDAY NIGHT...Northeast to east winds 15 to 20 knots. Bay waters choppy. Scattered showers and isolated thunderstorms. .WEDNESDAY...Northeast to east winds 15 to 20 knots. Bay waters choppy. Scattered showers and isolated thunderstorms. .WEDNESDAY NIGHT...Northeast to east winds 15 to 20 knots. Bay waters choppy. Scattered showers and isolated thunderstorms. $$ GMZ032-035-040845- 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- 440 PM EDT Fri Oct 3 2025 ...SMALL CRAFT SHOULD EXERCISE CAUTION UNTIL WINDS DECREASE... .TONIGHT...Northeast winds 15 to 20 knots, decreasing to 10 to 15 knots late. Seas 2 to 3 feet. Nearshore waters choppy, becoming a light to moderate chop. Scattered showers and isolated thunderstorms. .SATURDAY...Northeast to east winds near 10 knots, becoming south to southwest 5 to 10 knots. Seas 1 to 2 feet. Nearshore waters a light chop, becoming smooth to a light chop. Scattered showers and isolated thunderstorms. .SATURDAY NIGHT...South winds increasing to near 10 knots. Seas 1 to 2 feet. Nearshore waters becoming a light chop. Scattered showers and isolated thunderstorms. .SUNDAY...South to southwest winds near 10 knots. Seas 1 to 2 feet. Nearshore waters a light chop. Scattered showers and isolated thunderstorms. .SUNDAY NIGHT...Southeast winds near 10 knots. Seas around 1 foot. Nearshore waters a light chop. Scattered showers and isolated thunderstorms. .MONDAY...East to southeast winds near 10 knots. Seas around 1 foot. Nearshore waters a light chop. Scattered showers and isolated thunderstorms. .MONDAY NIGHT...Northeast to east winds increasing to 10 to 15 knots. Seas building to 1 to 2 feet. Nearshore waters becoming a light to moderate chop. Scattered showers and isolated thunderstorms. .TUESDAY...Northeast to east winds 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate chop. Scattered showers and isolated thunderstorms. .TUESDAY NIGHT...Northeast to east winds increasing to 15 to 20 knots. Seas building to 2 to 3 feet, except building to 3 to 4 feet west of the Marquesas Keys. Nearshore waters becoming choppy. Scattered showers and isolated thunderstorms. .WEDNESDAY...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. Scattered showers and isolated thunderstorms. .WEDNESDAY NIGHT...Northeast to east winds 15 to 20 knots. Seas 2 to 3 feet. West of the Marquesas Keys, seas 2 to 3 feet, building to 4 feet, occasionally to 5 feet after midnight. Nearshore waters choppy. Scattered showers and isolated thunderstorms. $$ GMZ042>044-040845- 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- 440 PM EDT Fri Oct 3 2025 ...SMALL CRAFT SHOULD EXERCISE CAUTION UNTIL WINDS DECREASE... .TONIGHT...Northeast to east winds 15 to 20 knots, decreasing to near 15 knots. Seas subsiding to 2 to 3 feet. Nearshore waters choppy, becoming a moderate chop. Scattered showers and isolated thunderstorms. .SATURDAY...Northwest to north winds near 10 knots, becoming south to southwest 5 to 10 knots. Seas 2 to 3 feet, subsiding to 1 to 2 feet. Nearshore waters a light chop, becoming smooth to a light chop. Scattered showers and isolated thunderstorms. .SATURDAY NIGHT...South winds 5 to 10 knots, increasing to 10 to 15 knots. Seas building to around 2 feet. Nearshore waters smooth to a light chop, becoming a light to moderate chop. Scattered showers and isolated thunderstorms. .SUNDAY...South winds near 10 knots. Seas 1 to 2 feet. Nearshore waters a light chop. Scattered showers and isolated thunderstorms. .SUNDAY NIGHT...Southeast winds near 10 knots. Seas 1 to 2 feet. Nearshore waters a light chop. Scattered showers and isolated thunderstorms. .MONDAY...East winds near 10 knots. Seas 1 to 2 feet. Nearshore waters a light chop. Scattered showers and isolated thunderstorms. .MONDAY NIGHT...Northeast to 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...Northeast to east winds near 15 knots. Seas 2 to 3 feet. Nearshore waters a moderate chop. Scattered showers and isolated thunderstorms. .TUESDAY NIGHT...Northeast to east winds 15 to 20 knots. Seas building to 3 to 4 feet. Nearshore waters choppy. Scattered showers and isolated thunderstorms. .WEDNESDAY...Northeast to east winds 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. Nearshore waters choppy. Scattered showers and isolated thunderstorms. .WEDNESDAY NIGHT...Northeast to east winds 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Nearshore waters choppy. Scattered showers and isolated thunderstorms. $$ GMZ053>055-073>075-040845- 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 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- 440 PM EDT Fri Oct 3 2025 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TONIGHT...Northeast to east winds 15 to 20 knots, becoming east to southeast 10 to 15 knots. Seas 3 to 6 feet, occasionally to 7 feet. Wave Detail: Northeast 4 feet at 6 seconds. Scattered showers and isolated thunderstorms. .SATURDAY...South to southwest winds near 10 knots, briefly decreasing to 5 to 10 knots in the afternoon. Seas 3 to 4 feet, occasionally to 5 feet, subsiding to 2 to 3 feet. Wave Detail: Northeast 3 feet at 6 seconds. Scattered showers and isolated thunderstorms. .SATURDAY NIGHT...South winds near 10 knots, increasing to 10 to 15 knots. Seas 2 to 3 feet. Wave Detail: East to southeast 2 feet at 6 seconds. Scattered showers and isolated thunderstorms. .SUNDAY...South to southwest winds near 10 knots, becoming southeast 5 to 10 knots. Seas 2 to 3 feet, subsiding to 1 to 2 feet. Scattered showers and isolated thunderstorms. .SUNDAY NIGHT...Southeast winds increasing to near 10 knots. Seas building to around 2 feet. Scattered showers and isolated thunderstorms. .MONDAY...East winds near 10 knots. Seas around 2 feet. Scattered showers and isolated thunderstorms. .MONDAY NIGHT...Northeast to east winds 10 to 15 knots. Seas 2 to 3 feet. Scattered showers and isolated thunderstorms. .TUESDAY...Northeast to east winds increasing to near 15 knots. Seas 2 to 4 feet. Scattered showers and isolated thunderstorms. .TUESDAY NIGHT...Northeast to east winds 15 to 20 knots. Seas building to 3 to 5 feet, occasionally to 6 feet. Scattered showers and isolated thunderstorms. .WEDNESDAY...Northeast to east winds 15 to 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. Scattered showers and isolated thunderstorms. .WEDNESDAY NIGHT...Northeast to east winds 15 to 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. Scattered showers and isolated thunderstorms. $$ GMZ052-072-040845- Straits of Florida from Ocean Reef to Craig Key out 20 NM- Straits of Florida from Ocean Reef to Craig Key 20 to 60 NM out- 440 PM EDT Fri Oct 3 2025 ...SMALL CRAFT ADVISORY IN EFFECT... .TONIGHT...Northeast to east winds 15 to 20 knots, becoming east to southeast 10 to 15 knots. Seas 4 to 7 feet in a north swell. Seas subsiding to 3 to 6 feet overnight. Wave Detail: Northeast 4 feet at 6 seconds. Scattered showers and isolated thunderstorms. .SATURDAY...South to southwest winds near 10 knots, briefly decreasing to 5 to 10 knots in the afternoon. Seas 3 to 4 feet, occasionally to 5 feet, subsiding to 2 to 3 feet. Wave Detail: Northeast 3 feet at 6 seconds. Scattered showers and isolated thunderstorms. .SATURDAY NIGHT...South winds near 10 knots, increasing to 10 to 15 knots. Seas 2 to 3 feet. Wave Detail: East to southeast 2 feet at 6 seconds. Scattered showers and isolated thunderstorms. .SUNDAY...South to southwest winds near 10 knots, becoming southeast 5 to 10 knots. Seas 2 to 3 feet, subsiding to 1 to 2 feet. Scattered showers and isolated thunderstorms. .SUNDAY NIGHT...Southeast winds increasing to near 10 knots. Seas building to around 2 feet. Scattered showers and isolated thunderstorms. .MONDAY...East winds near 10 knots. Seas around 2 feet. Scattered showers and isolated thunderstorms. .MONDAY NIGHT...Northeast to east winds 10 to 15 knots. Seas 2 to 3 feet. Scattered showers and isolated thunderstorms. .TUESDAY...Northeast to east winds increasing to near 15 knots. Seas 2 to 4 feet. Scattered showers and isolated thunderstorms. .TUESDAY NIGHT...Northeast to east winds 15 to 20 knots. Seas building to 3 to 5 feet, occasionally to 6 feet. Scattered showers and isolated thunderstorms. .WEDNESDAY...Northeast to east winds 15 to 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. Scattered showers and isolated thunderstorms. .WEDNESDAY NIGHT...Northeast to east winds 15 to 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. Scattered showers and isolated thunderstorms. $$ GMZ033-034-040845- 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- 440 PM EDT Fri Oct 3 2025 ...SMALL CRAFT SHOULD EXERCISE CAUTION UNTIL WINDS DECREASE... .TONIGHT...Northeast to east winds 15 to 20 knots, decreasing to near 15 knots late. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast to east 4 feet at 5 seconds. Scattered showers and isolated thunderstorms. .SATURDAY...Northeast to east winds 10 to 15 knots, becoming southeast to south 5 to 10 knots. Seas 2 to 4 feet, occasionally to 5 feet, subsiding to 1 to 3 feet. Wave Detail: North to northeast 3 feet at 5 seconds. Scattered showers and isolated thunderstorms. .SATURDAY NIGHT...Southeast to south winds 5 to 10 knots, becoming south 10 to 15 knots. Seas 1 to 2 feet. Wave Detail: North 1 foot at 4 seconds and southeast 1 foot at 4 seconds. Scattered showers and isolated thunderstorms. .SUNDAY...South to southwest winds near 10 knots. Seas 1 to 2 feet. Scattered showers and isolated thunderstorms. .SUNDAY NIGHT...Southeast to south winds near 10 knots. Seas 1 to 2 feet. Scattered showers and isolated thunderstorms. .MONDAY...East to southeast winds near 10 knots. Seas around 1 foot. Scattered showers and isolated thunderstorms. .MONDAY NIGHT...Northeast to east winds increasing to 10 to 15 knots. Seas 1 to 2 feet, building to around 2 feet. Scattered showers and isolated thunderstorms. .TUESDAY...Northeast winds 10 to 15 knots. Seas around 2 feet. Scattered showers and isolated thunderstorms. .TUESDAY NIGHT...Northeast to east winds increasing to 15 to 20 knots. Seas building to 3 to 4 feet, occasionally to 5 feet. Scattered showers and isolated thunderstorms. .WEDNESDAY...Northeast to east winds 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. Scattered showers and isolated thunderstorms. .WEDNESDAY NIGHT...Northeast to east winds 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. Scattered showers and isolated thunderstorms. $$