FZUS52 KKEY 180817 CWFKEY Coastal Waters Forecast for the Florida Keys National Weather Service Key West FL 417 AM EDT Mon May 18 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. GMZ005-182030- Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas 417 AM EDT Mon May 18 2026 .SYNOPSIS...High pressure centered near Bermuda will continue to promote moderate to fresh east to southeast breezes for today and tonight. Breezes then undergo a very slow slackening process with peaks expected during the evenings and lulls during the day. Rain and thunder chances will remain above normal through much of the week. The Approximate Shoreward Edge of the Gulf Stream as of May 12... 35 NM South of Dry Tortugas Light...on Loggerhead Key. 9 NM South of Cosgrove Shoal Light...off the Marquesas Keys. 6 NM South of Sand Key Light...off Key West. 7 NM South of Looe Key...off Big Pine Key. 6 NM Southeast 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. 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. $$ GMZ031-182030- Florida Bay including Barnes Sound, Blackwater Sound, and Buttonwood Sound- 417 AM EDT Mon May 18 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...East to southeast winds 15 to 20 knots. Bay waters choppy. A chance of showers with a slight chance of thunderstorms. .TONIGHT...East winds 15 to 20 knots. Bay waters choppy. A chance of showers with a slight chance of thunderstorms. .TUESDAY...East winds near 15 knots. Bay waters a moderate chop. A chance of showers with a slight chance of thunderstorms. .TUESDAY NIGHT...East winds near 15 knots. Bay waters a moderate chop. A chance of showers with a slight chance of thunderstorms. .WEDNESDAY...East winds 10 to 15 knots. Bay waters a light to moderate chop. A slight chance of showers and thunderstorms. .WEDNESDAY NIGHT...East winds near 15 knots, decreasing to 10 to 15 knots. Bay waters a moderate chop, becoming a light to moderate chop. A slight chance of showers and thunderstorms. .THURSDAY...East winds 10 to 15 knots. Bay waters a light to moderate chop. A slight chance of showers and thunderstorms. .THURSDAY NIGHT...East winds near 10 knots. Bay waters a light chop. A slight chance of showers. .FRIDAY...East to southeast winds 5 to 10 knots. Bay waters smooth to a light chop. A slight chance of showers and thunderstorms. .FRIDAY NIGHT...East to southeast winds near 10 knots. Bay waters a light chop. A slight chance of showers. $$ GMZ032-035-182030- 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 Mon May 18 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...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. A chance of showers with a slight chance of thunderstorms. .TONIGHT...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. A chance of showers with a slight chance of thunderstorms. .TUESDAY...East winds near 15 knots. Seas 1 to 2 feet, except 2 to 3 feet west of the Marquesas Keys. Nearshore waters a moderate chop. A chance of showers with a slight chance of thunderstorms. .TUESDAY NIGHT...East winds 15 to 20 knots, decreasing to near 15 knots. Seas 1 to 2 feet, except 2 to 4 feet, occasionally to 5 feet west of the Marquesas Keys. Nearshore waters choppy, becoming a moderate chop. A chance of showers with a slight chance of thunderstorms. .WEDNESDAY...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. A chance of showers with a slight chance of thunderstorms. .WEDNESDAY NIGHT...East 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. A slight chance of showers and thunderstorms. .THURSDAY...East winds near 10 knots. Seas 1 to 2 feet. Nearshore waters a light chop. A slight chance of showers and thunderstorms. .THURSDAY NIGHT...East to southeast winds near 10 knots. Seas 1 to 2 feet. Nearshore waters a light chop. A slight chance of showers. .FRIDAY...East to southeast winds 5 to 10 knots. Seas around 1 foot. Nearshore waters smooth to a light chop. A slight chance of showers and thunderstorms. .FRIDAY NIGHT...East to southeast winds near 10 knots. Seas around 1 foot, except building to 1 to 2 feet west of the Marquesas Keys. Nearshore waters a light chop. A slight chance of showers and thunderstorms. $$ GMZ042>044-182030- Hawk Channel from Ocean Reef to Craig Key out to the reef- Hawk Channel from Craig Key to west end of Seven Mile Bridge out to the reef- Hawk Channel from west end of Seven Mile Bridge to Halfmoon Shoal out to the reef- 417 AM EDT Mon May 18 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...East to southeast winds 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Nearshore waters choppy. A chance of showers with a slight chance of thunderstorms. .TONIGHT...East winds 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Nearshore waters choppy. A chance of showers with a slight chance of thunderstorms. .TUESDAY...East winds near 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Nearshore waters a moderate chop. A chance of showers with a slight chance of thunderstorms. .TUESDAY NIGHT...East winds 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. Nearshore waters choppy. A chance of showers with a slight chance of thunderstorms. .WEDNESDAY...East winds near 15 knots. Seas 2 to 3 feet. Nearshore waters a moderate chop. A slight chance of showers and thunderstorms. .WEDNESDAY NIGHT...East winds near 15 knots, decreasing to 10 to 15 knots. Seas 2 to 3 feet. Nearshore waters a moderate chop, becoming a light to moderate chop. A slight chance of showers and thunderstorms. .THURSDAY...East winds 10 to 15 knots. Seas around 2 feet. Nearshore waters a light to moderate chop. A slight chance of showers and thunderstorms. .THURSDAY NIGHT...East to southeast winds near 10 knots. Seas 1 to 2 feet. Nearshore waters a light chop. A slight chance of showers and thunderstorms. .FRIDAY...East to southeast winds 5 to 10 knots. Seas 1 to 2 feet, subsiding to around 1 foot. Nearshore waters smooth to a light chop. A slight chance of showers. .FRIDAY NIGHT...East to southeast winds near 10 knots. Seas building to 1 to 2 feet. Nearshore waters a light chop. A slight chance of showers and thunderstorms. $$ GMZ052>055-072>075-182030- 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 Mon May 18 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...East to southeast winds 15 to 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: East 5 feet at 6 seconds. A chance of showers with a slight chance of thunderstorms. .TONIGHT...East winds 15 to 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: East 6 feet at 6 seconds. A chance of showers with a slight chance of thunderstorms. .TUESDAY...East winds near 15 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 6 seconds. A chance of showers with a slight chance of thunderstorms. .TUESDAY NIGHT...East winds 15 to 20 knots. Seas 4 to 5 feet, occasionally to 6 feet. A chance of showers with a slight chance of thunderstorms. .WEDNESDAY...East winds near 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. A slight chance of showers and thunderstorms. .WEDNESDAY NIGHT...East winds near 15 knots, decreasing to 10 to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. A slight chance of showers and thunderstorms. .THURSDAY...East winds 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. A slight chance of showers and thunderstorms. .THURSDAY NIGHT...East to southeast winds near 10 knots. Seas 2 to 3 feet. A slight chance of showers and thunderstorms. .FRIDAY...East to southeast winds near 10 knots. Seas around 2 feet. A slight chance of showers. .FRIDAY NIGHT...East to southeast winds 10 to 15 knots. Seas 2 to 3 feet. A slight chance of showers and thunderstorms. $$ GMZ033-034-182030- Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM out and beyond 5 fathoms- Gulf of America including Dry Tortugas and Rebecca Shoal Channel- 417 AM EDT Mon May 18 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...East to southeast winds 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: East 3 feet at 5 seconds. A chance of showers with a slight chance of thunderstorms. .TONIGHT...East winds 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 5 seconds. A chance of showers with a slight chance of thunderstorms. .TUESDAY...East winds near 15 knots, decreasing to 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: East 3 feet at 5 seconds. A chance of showers with a slight chance of thunderstorms. .TUESDAY NIGHT...East winds near 15 knots. Seas 2 to 3 feet. A chance of showers with a slight chance of thunderstorms. .WEDNESDAY...East winds 10 to 15 knots. Seas 2 to 3 feet. A slight chance of showers and thunderstorms. .WEDNESDAY NIGHT...East winds 10 to 15 knots. Seas 1 to 2 feet. A slight chance of showers and thunderstorms. .THURSDAY...East winds 10 to 15 knots, decreasing to 5 to 10 knots. Seas 1 to 2 feet. A slight chance of showers and thunderstorms. .THURSDAY NIGHT...East winds 5 to 10 knots. Seas 1 to 2 feet. A slight chance of showers and thunderstorms. .FRIDAY...East to southeast winds near 5 knots. Seas 1 to 2 feet. A slight chance of showers and thunderstorms. .FRIDAY NIGHT...East to southeast winds near 10 knots. Seas 1 to 2 feet. A slight chance of showers and thunderstorms. $$