FZUS52 KKEY 191443 CWFKEY Coastal Waters Forecast for the Florida Keys National Weather Service Key West FL 1043 AM EDT Tue May 19 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. GMZ005-200245- Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas 1043 AM EDT Tue May 19 2026 .SYNOPSIS...Surface high pressure centered north of Bermuda will continue to promote moderate to fresh east to southeast breezes through tonight. Highest breezes will prevail through this evening. Breezes will then slowly slacken before the weekend 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. $$ GMZ031-200245- Florida Bay including Barnes Sound, Blackwater Sound, and Buttonwood Sound- 1043 AM EDT Tue May 19 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .THIS AFTERNOON...East winds 15 to 20 knots. Bay waters choppy. A chance of showers with a slight chance of thunderstorms. .TONIGHT...East winds 15 to 20 knots in the evening, decreasing to near 15 knots. Bay waters choppy, becoming a moderate chop. A chance of showers with a slight chance of thunderstorms. .WEDNESDAY...East winds 10 to 15 knots. Bay waters a light to moderate chop. A chance of showers with a slight chance of thunderstorms. .WEDNESDAY NIGHT...East winds 10 to 15 knots, decreasing to near 10 knots. Bay waters a light to moderate chop, becoming a light chop. A chance of showers with a slight chance of thunderstorms. .THURSDAY...East winds near 10 knots, increasing to 10 to 15 knots. Bay waters a light chop, becoming a light to moderate chop. A slight chance of showers and thunderstorms. .THURSDAY NIGHT...East winds 10 to 15 knots. Bay waters a light to moderate chop. A slight chance of showers and thunderstorms. .FRIDAY...East to southeast winds near 10 knots. Bay waters a light chop. A slight chance of showers and thunderstorms. .FRIDAY NIGHT...East to southeast winds 10 to 15 knots. Bay waters a light to moderate chop. A slight chance of showers and thunderstorms. .SATURDAY...East to southeast winds 10 to 15 knots. Bay waters a light to moderate chop. A chance of showers with a slight chance of thunderstorms. .SATURDAY NIGHT...East to southeast winds 10 to 15 knots. Bay waters a light to moderate chop. A chance of showers with a slight chance of thunderstorms. $$ GMZ032-035-200245- 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- 1043 AM EDT Tue May 19 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .THIS AFTERNOON...East winds 15 to 20 knots. Seas 2 to 3 feet, except around 3 feet west of the Marquesas Keys. Nearshore waters choppy. Showers likely with a slight chance of thunderstorms. .TONIGHT...East winds 15 to 20 knots, decreasing to near 15 knots. Seas 1 to 2 feet, except around 3 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 subsiding to 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 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate chop. A chance of showers with a slight chance of thunderstorms. .THURSDAY...East winds near 10 knots, increasing to 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a light chop, becoming a light to moderate chop. A slight chance of showers and thunderstorms. .THURSDAY NIGHT...East winds 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate chop. A slight chance of showers and thunderstorms. .FRIDAY...East to southeast winds near 10 knots. Seas around 1 foot. Nearshore waters a light chop. A slight chance of showers and thunderstorms. .FRIDAY NIGHT...East to southeast winds 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate chop. A slight chance of showers and thunderstorms. .SATURDAY...East to southeast winds near 10 knots. Seas around 1 foot. Nearshore waters a light chop. A slight chance of showers and thunderstorms. .SATURDAY NIGHT...East to southeast winds 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate chop. A chance of showers with a slight chance of thunderstorms. $$ GMZ042>044-200245- 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- 1043 AM EDT Tue May 19 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .THIS AFTERNOON...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. .TONIGHT...East winds 15 to 20 knots, decreasing to near 15 knots. Seas 2 to 4 feet, occasionally to 5 feet, subsiding to 2 to 3 feet. 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 Cosgrove Shoal Light. Nearshore waters a light to moderate chop. A chance of showers with a slight chance of thunderstorms. .WEDNESDAY NIGHT...East winds 10 to 15 knots. Seas 1 to 2 feet, except 2 to 3 feet west of Cosgrove Shoal Light. Nearshore waters a light to moderate chop. A chance of showers with a slight chance of thunderstorms. .THURSDAY...East winds near 10 knots, increasing to 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a light chop, becoming a light to moderate chop. A slight chance of showers and thunderstorms. .THURSDAY NIGHT...East winds 10 to 15 knots, becoming east to southeast. Seas around 2 feet. Nearshore waters a light to moderate chop. A slight chance of showers and thunderstorms. .FRIDAY...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 NIGHT...East to southeast winds 10 to 15 knots. Seas around 2 feet. Nearshore waters a light to moderate chop. A slight chance of showers and thunderstorms. .SATURDAY...East to southeast winds near 10 knots. Seas 1 to 2 feet. Nearshore waters a light chop. A slight chance of showers and thunderstorms. .SATURDAY NIGHT...East to southeast 10 to 15 knots. Seas 2 to 3 feet. Nearshore waters a light to moderate chop. A chance of showers with a slight chance of thunderstorms. $$ GMZ052>055-072>075-200245- 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- 1043 AM EDT Tue May 19 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .THIS AFTERNOON...East winds 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet at 6 seconds. A chance of showers with a slight chance of thunderstorms. .TONIGHT...East winds 15 to 20 knots, decreasing to near 15 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet at 5 seconds. A chance of showers with a slight chance of thunderstorms. .WEDNESDAY...East winds 10 to 15 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. .WEDNESDAY NIGHT...East winds 10 to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. A chance of showers with a slight chance of 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 winds 10 to 15 knots, becoming east to southeast. Seas 2 to 4 feet, occasionally to 5 feet. A slight chance of showers and thunderstorms. .FRIDAY...East to southeast winds near 10 knots. Seas 2 to 3 feet. A slight chance of showers and thunderstorms. .FRIDAY NIGHT...East to southeast winds 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. A slight chance of showers and thunderstorms. .SATURDAY...East to southeast winds 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. A slight chance of showers and thunderstorms. .SATURDAY NIGHT...East to southeast winds 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. A chance of showers with a slight chance of thunderstorms. $$ GMZ033-034-200245- Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM out and beyond 5 fathoms- Gulf of America including Dry Tortugas and Rebecca Shoal Channel- 1043 AM EDT Tue May 19 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .THIS AFTERNOON...East winds 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 5 seconds. A chance of showers with a slight chance of thunderstorms. .TONIGHT...East winds 15 to 20 knots, decreasing to near 15 knots. Seas 2 to 4 feet, occasionally to 5 feet, subsiding to 2 to 3 feet. Wave Detail: East 3 feet at 4 seconds. A chance of showers with a slight chance of thunderstorms. .WEDNESDAY...East winds 10 to 15 knots. Seas 2 to 3 feet. Wave Detail: East 3 feet at 5 seconds. A chance of showers with a slight chance of thunderstorms. .WEDNESDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 3 feet. A chance of showers with a slight chance of thunderstorms. .THURSDAY...East winds near 10 knots. Seas around 2 feet. A slight chance of showers and thunderstorms. .THURSDAY NIGHT...East winds 10 to 15 knots, becoming east to southeast. Seas around 2 feet. A slight chance of showers and thunderstorms. .FRIDAY...East to southeast winds near 10 knots. Seas 1 to 2 feet. A slight chance of showers and thunderstorms. .FRIDAY NIGHT...East to southeast winds near 10 knots. Seas 1 to 2 feet. A slight chance of showers and thunderstorms. .SATURDAY...East to southeast winds 5 to 10 knots, increasing to near 10 knots. Seas around 1 foot. A slight chance of showers and thunderstorms. .SATURDAY NIGHT...East to southeast winds 10 to 15 knots. Seas 1 to 2 feet. A slight chance of showers and thunderstorms. $$