GMZ005-240230-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1028 AM EDT Fri Oct 23 2026
.SYNOPSIS...
High pressure centered just north of the Great Lakes region will
continue to slide eastward and strengthen over the next several
days. The high will interact with a developing disturbance in the
eastern Caribbean, supporting freshening northeasterly breezes
over the next several days. Breezes will peak Sunday night through
Tuesday, when strong to near gale breezes will be possible. The
freshening breezes and a surge of moisture may also support
elevated rain and isolated strong thunderstorm chances Friday
night through Monday.
The Approximate Shoreward Edge of the Gulf Stream as of October
19, 2026...
46 NM south of Dry Tortugas Light, on Loggerhead Key
18 NM north of Cosgrove Shoal Light, off the Marquesas Keys
12 NM north of Sand Key Light, off Key West
7 NM north-northwest of Looe Key, off Big Pine Key
5 NM southeast of Sombrero Key Light, off Marathon
2 NM south-southeast of Alligator Reef Light, off Islamorada
2 NM northwest of Molasses Reef Light, off Key Largo
3 NM northwest of Carysfort Reef Light, off Ocean Reef
Gulf Stream Information Courtesy of the Naval Oceanographic
Office.
$$
GMZ052>055-072>075-240230- 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- 1028 AM EDT Fri Oct 23 2026 SMALL CRAFT EXERCISE CAUTION THIS AFTERNOON Northeast winds 15 to 20 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: Northeast 5 feet at 6 seconds. Showers likely with a slight chance of thunderstorms. TONIGHT Northeast winds near 20 knots. Seas 4 to 7 feet, occasionally to 9 feet. Wave Detail: Northeast 6 feet at 6 seconds. Showers with a slight chance of thunderstorms. SATURDAY Northeast winds near 20 knots. Seas 5 to 7 feet, occasionally to 9 feet. Wave Detail: Northeast 6 feet at 7 seconds. A chance of showers with a slight chance of thunderstorms. SATURDAY NIGHT North to northeast winds near 20 knots, decreasing to 15 to 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. A chance of showers with a slight chance of thunderstorms. SUNDAY North to northeast winds 15 to 20 knots, increasing to near 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. A chance of showers with a slight chance of thunderstorms. SUNDAY NIGHT Northeast winds 20 to 25 knots. Seas building to 6 to 9 feet, occasionally to 11 feet. Showers with a slight chance of thunderstorms. MONDAY North to northeast winds 20 to 25 knots, increasing to near 25 knots. Seas 6 to 9 feet, occasionally to 11 feet. Showers likely with a slight chance of thunderstorms. MONDAY NIGHT North to northeast winds 25 to 30 knots. Seas 7 to 10 feet, occasionally to 13 feet. A chance of showers with a slight chance of thunderstorms. TUESDAY North to northeast winds 25 to 30 knots, decreasing to near 25 knots. Seas 7 to 10 feet, occasionally to 13 feet, subsiding to 5 to 8 feet, occasionally to 10 feet. A chance of showers with a slight chance of thunderstorms. TUESDAY NIGHT Northeast winds near 25 knots, decreasing to 20 to 25 knots. Seas 5 to 8 feet, occasionally to 10 feet, subsiding to 5 to 7 feet, occasionally to 9 feet. A chance of showers with a slight chance of thunderstorms. $$
GMZ052>055-072>075-240230- 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- 1028 AM EDT Fri Oct 23 2026 SMALL CRAFT EXERCISE CAUTION THIS AFTERNOON Northeast winds 15 to 20 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: Northeast 5 feet at 6 seconds. Showers likely with a slight chance of thunderstorms. TONIGHT Northeast winds near 20 knots. Seas 4 to 7 feet, occasionally to 9 feet. Wave Detail: Northeast 6 feet at 6 seconds. Showers with a slight chance of thunderstorms. SATURDAY Northeast winds near 20 knots. Seas 5 to 7 feet, occasionally to 9 feet. Wave Detail: Northeast 6 feet at 7 seconds. A chance of showers with a slight chance of thunderstorms. SATURDAY NIGHT North to northeast winds near 20 knots, decreasing to 15 to 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. A chance of showers with a slight chance of thunderstorms. SUNDAY North to northeast winds 15 to 20 knots, increasing to near 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. A chance of showers with a slight chance of thunderstorms. SUNDAY NIGHT Northeast winds 20 to 25 knots. Seas building to 6 to 9 feet, occasionally to 11 feet. Showers with a slight chance of thunderstorms. MONDAY North to northeast winds 20 to 25 knots, increasing to near 25 knots. Seas 6 to 9 feet, occasionally to 11 feet. Showers likely with a slight chance of thunderstorms. MONDAY NIGHT North to northeast winds 25 to 30 knots. Seas 7 to 10 feet, occasionally to 13 feet. A chance of showers with a slight chance of thunderstorms. TUESDAY North to northeast winds 25 to 30 knots, decreasing to near 25 knots. Seas 7 to 10 feet, occasionally to 13 feet, subsiding to 5 to 8 feet, occasionally to 10 feet. A chance of showers with a slight chance of thunderstorms. TUESDAY NIGHT Northeast winds near 25 knots, decreasing to 20 to 25 knots. Seas 5 to 8 feet, occasionally to 10 feet, subsiding to 5 to 7 feet, occasionally to 9 feet. A chance of showers with a slight chance of thunderstorms. $$