FZUS52 KKEY 132128 CWFKEY Coastal Waters Forecast for the Florida Keys National Weather Service Key West FL 428 PM EST Sat Dec 13 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. GMZ005-140930- Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas 428 PM EST Sat Dec 13 2025 .SYNOPSIS...Gentle to moderate breezes will gradually slacken through the overnight ahead of the next frontal passage. The next front is progged to push through the Florida Keys marine zones Sunday evening. Ahead of the front, elevated chances for showers and thunderstorms will be possible tonight through early Sunday. In the wake of the frontal passage, fresh to strong northeasterly breezes are expected Sunday night through at least Tuesday. Breezes slacken starting Wednesday but will remain gentle to moderate at times. The Approximate Shoreward Edge of the Gulf Stream as of December 8... 15 NM South of Dry Tortugas Light...on Loggerhead Key. 13 NM South of Cosgrove Shoal Light...off the Marquesas Keys. 14 NM South of Sand Key Light...off Key West. 18 NM South of Looe Key...off Big Pine Key. 23 NM Southeast of Sombrero Key Light...off Marathon. 18 NM Southeast of Alligator Reef Light...off Islamorada. 12 NM Southeast of Molasses Reef Light...off Key Largo. 8 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. $$ GMZ031-140930- Florida Bay including Barnes Sound, Blackwater Sound, and Buttonwood Sound- 428 PM EST Sat Dec 13 2025 .TONIGHT...East winds 10 to 15 knots, becoming northeast to east. Bay waters a light to moderate chop. Bay waters rough and winds higher in and around widespread showers and scattered thunderstorms. .SUNDAY...Northeast to east winds 10 to 15 knots, becoming northwest to north near 10 knots in the afternoon. Bay waters a light to moderate chop, becoming a light chop. Scattered showers and isolated thunderstorms in the morning, then scattered showers in the afternoon. .SUNDAY NIGHT...Northwest to north winds near 10 knots, becoming north to northeast 15 to 20 knots after midnight. Bay waters a light chop, becoming choppy. Isolated showers. .MONDAY...Northeast winds increasing to 20 to 25 knots. Bay waters becoming very rough. Isolated showers. .MONDAY NIGHT...Northeast winds 20 to 25 knots, decreasing to near 20 knots. Bay waters very rough, becoming rough. Isolated showers. .TUESDAY...Northeast winds 15 to 20 knots. Bay waters choppy. Isolated showers. .TUESDAY NIGHT...Northeast to east winds 15 to 20 knots, decreasing to near 15 knots. Bay waters choppy, becoming a moderate chop. .WEDNESDAY...East winds near 15 knots. Bay waters a moderate chop. .WEDNESDAY NIGHT...East winds 10 to 15 knots. Bay waters a light to moderate chop. .THURSDAY...East winds 10 to 15 knots. Bay waters a light to moderate chop. Isolated showers. .THURSDAY NIGHT...East winds decreasing to near 10 knots. Bay waters becoming a light chop. Isolated showers. $$ GMZ032-035-140930- 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- 428 PM EST Sat Dec 13 2025 .TONIGHT...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. Winds and seas higher in and around widespread showers and scattered thunderstorms. .SUNDAY...Northeast to east winds 10 to 15 knots, becoming northwest to north in the afternoon. Seas 1 to 2 feet, subsiding to around 1 foot. West of the Marquesas Keys, seas 2 to 3 feet, subsiding to 1 to 2 feet. Nearshore waters a light to moderate chop. Scattered showers and isolated thunderstorms in the morning, then scattered showers in the afternoon. .SUNDAY NIGHT...Northwest to north winds near 15 knots, becoming north to northeast near 20 knots after midnight. Seas 1 to 2 feet, building to 2 to 4 feet, occasionally to 5 feet. West of the Marquesas Keys, seas 2 to 3 feet, building to 4 to 5 feet, occasionally to 6 feet. Nearshore waters a moderate chop, becoming rough. Isolated showers. .MONDAY...Northeast winds 20 to 25 knots. Seas 3 to 5 feet, occasionally to 6 feet, except 5 to 6 feet, occasionally to 8 feet west of the Marquesas Keys. Nearshore waters very rough. Isolated showers. .MONDAY NIGHT...Northeast winds 20 to 25 knots, decreasing to near 20 knots. Seas 3 to 5 feet, occasionally to 6 feet, except 5 to 6 feet, occasionally to 8 feet west of the Marquesas Keys. Nearshore waters very rough, becoming rough. Isolated showers. .TUESDAY...Northeast winds near 20 knots, decreasing to 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet, except 4 to 6 feet, occasionally to 8 feet west of the Marquesas Keys. Nearshore waters rough, becoming choppy. Isolated showers. .TUESDAY NIGHT...Northeast to east 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. .WEDNESDAY...East winds near 15 knots. Seas 2 to 3 feet, except 3 to 4 feet, occasionally to 5 feet west of the Marquesas Keys. Nearshore waters a moderate chop. .WEDNESDAY NIGHT...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. .THURSDAY...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. .THURSDAY NIGHT...East winds 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate chop. Isolated showers. $$ GMZ042>044-140930- 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- 428 PM EST Sat Dec 13 2025 .TONIGHT...East winds near 15 knots, becoming northeast to east 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Nearshore waters a moderate chop, becoming a light to moderate chop. Winds and seas higher in and around widespread showers and scattered thunderstorms. .SUNDAY...Northeast to east winds 10 to 15 knots, becoming north in the afternoon. Seas 2 to 3 feet, subsiding to 1 to 2 feet. Nearshore waters a light to moderate chop. Scattered showers and isolated thunderstorms in the morning, then scattered showers in the afternoon. .SUNDAY NIGHT...Northwest to north winds 10 to 15 knots, becoming north to northeast near 20 knots after midnight. Seas 1 to 2 feet, except building to 2 to 4 feet, occasionally to 5 feet west of Cosgrove Shoal Light. Nearshore waters a light to moderate chop, becoming rough. Isolated showers. .MONDAY...Northeast winds 20 to 25 knots. Seas 2 to 4 feet, occasionally to 5 feet, except 4 to 6 feet, occasionally to 8 feet west of Cosgrove Shoal Light. Nearshore waters very rough. Isolated showers. .MONDAY NIGHT...Northeast winds 20 to 25 knots. Seas 3 to 4 feet, occasionally to 5 feet, except 4 to 6 feet, occasionally to 8 feet west of Cosgrove Shoal Light. Nearshore waters very rough. Isolated showers. .TUESDAY...Northeast winds near 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Nearshore waters rough. Isolated showers. .TUESDAY NIGHT...Northeast to east winds near 20 knots, decreasing to 15 to 20 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 rough, becoming choppy. Isolated showers. .WEDNESDAY...East winds near 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Nearshore waters a moderate chop. Isolated showers. .WEDNESDAY NIGHT...East winds near 15 knots. Seas 2 to 3 feet. Nearshore waters a moderate chop. Isolated showers. .THURSDAY...East winds near 15 knots. Seas 2 to 3 feet. Nearshore waters a moderate chop. Isolated showers. .THURSDAY NIGHT...East winds 10 to 15 knots. Seas subsiding to around 2 feet. Nearshore waters a light to moderate chop. Isolated showers. $$ GMZ052>055-072>075-140930- 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- 428 PM EST Sat Dec 13 2025 ...SMALL CRAFT SHOULD EXERCISE CAUTION UNTIL WINDS DECREASE... .TONIGHT...East to southeast winds 15 to 20 knots, becoming northeast to east 10 to 15 knots after midnight. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 6 seconds. Winds and seas higher in and around widespread showers and scattered thunderstorms. .SUNDAY...Northeast to east winds 10 to 15 knots, becoming north to northeast in the afternoon. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast to east 4 feet at 5 seconds. Scattered showers and isolated thunderstorms. .SUNDAY NIGHT...Northwest to north winds 10 to 15 knots, becoming north to northeast near 20 knots. Seas 2 to 4 feet, occasionally to 5 feet, building to 4 to 6 feet, occasionally to 7 feet. Wave Detail: North to northeast 4 feet at 5 seconds. Scattered showers. .MONDAY...Northeast winds 20 to 25 knots. Seas 5 to 8 feet, occasionally to 10 feet. Scattered showers. .MONDAY NIGHT...Northeast winds 20 to 25 knots. Seas 7 to 9 feet, occasionally to 11 feet. Scattered showers. .TUESDAY...Northeast to east winds 20 to 25 knots. Seas 6 to 8 feet, occasionally to 10 feet. Isolated showers. .TUESDAY NIGHT...Northeast to east winds near 20 knots, decreasing to 15 to 20 knots. Seas 6 to 8 feet, occasionally to 10 feet, subsiding to 5 to 7 feet, occasionally to 8 feet. Isolated showers. .WEDNESDAY...East winds 15 to 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. Isolated showers. .WEDNESDAY NIGHT...East winds 15 to 20 knots, decreasing to near 15 knots. Seas 4 to 5 feet, occasionally to 6 feet. Isolated showers. .THURSDAY...East winds near 15 knots. Seas 3 to 5 feet, occasionally to 6 feet. Isolated showers. .THURSDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Isolated showers. $$ GMZ033-034-140930- Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM out and beyond 5 fathoms- Gulf of America including Dry Tortugas and Rebecca Shoal Channel- 428 PM EST Sat Dec 13 2025 .TONIGHT...East to southeast winds near 15 knots, decreasing to near 10 knots late. Seas 2 to 3 feet. Wave Detail: East 3 feet at 4 seconds. Winds and seas higher in and around numerous showers and scattered thunderstorms. .SUNDAY...East to southeast winds near 10 knots, becoming northwest to north near 15 knots in the afternoon. Seas subsiding to 1 to 2 feet. Wave Detail: East to southeast 2 feet at 4 seconds and northwest to north 1 foot at 2 seconds. Scattered showers. .SUNDAY NIGHT...North winds 15 to 20 knots, becoming north to northeast 20 to 25 knots after midnight. Seas 2 to 3 feet, building to 4 to 6 feet, occasionally to 8 feet. Wave Detail: North to northeast 3 feet at 4 seconds, becoming northwest to north 4 feet at 5 seconds. Isolated showers. .MONDAY...Northeast winds 20 to 25 knots. Seas 5 to 7 feet, occasionally to 9 feet. Isolated showers. .MONDAY NIGHT...Northeast winds decreasing to near 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. Isolated showers. .TUESDAY...Northeast to east winds near 20 knots, decreasing to 15 to 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. Isolated showers. .TUESDAY NIGHT...Northeast to east winds 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Isolated showers. .WEDNESDAY...East winds near 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Isolated showers. .WEDNESDAY NIGHT...East winds 15 to 20 knots, decreasing to near 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Isolated showers. .THURSDAY...East winds 10 to 15 knots. Seas 2 to 3 feet. .THURSDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 3 feet. Isolated showers. $$