GMZ005-101530-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1027 PM EST Tue Dec 9 2025
.SYNOPSIS...Moderate north to northeast breezes are expected to
continue into the overnight hours as a frontal boundary remains
draped across the Straits of Florida. As the front slides eastward
and away from the Florida Keys marine zones during the early
morning, breezes will slacken. A second weak front will push
through the coastal waters late Wednesday and Wednesday night,
with modestly freshened northwesterly breezes clocking around to
the northeast to east for late week and into the weekend.
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.
$$
GMZ052>055-072>075-101530- 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- 1027 PM EST Tue Dec 9 2025 SMALL CRAFT SHOULD EXERCISE CAUTION UNTIL WINDS DECREASE OVERNIGHT Northeast winds 15 to 20 knots early, decreasing to 10 to 15 knots. Seas 3 to 5 feet, occasionally to 6 feet, subsiding to 3 to 4, occasionally to 5 feet. Wave Detail: Northeast to east 4 feet at 5 seconds and northwest 2 feet at 7 seconds. Numerous showers and isolated thunderstorms. WEDNESDAY North to northeast winds near 10 knots, becoming northwest to north and decreasing to 5 to 10 knots. Seas subsiding to 2 to 3 feet. Wave Detail: Northeast to east 3 feet at 6 seconds and northwest 2 feet at 7 seconds. Scattered showers. WEDNESDAY NIGHT Northwest to north winds 5 to 10 knots, increasing to near 10 knots. Seas around 2 feet. Wave Detail: North to northeast 2 feet at 3 seconds and northeast 2 feet at 6 seconds. Isolated showers. THURSDAY North winds near 10 knots. Seas around 2 feet. Isolated showers. THURSDAY NIGHT Northeast winds near 10 knots. Seas around 2 feet. FRIDAY Northeast to east winds 10 to 15 knots. Seas 2 to 3 feet. Isolated showers. FRIDAY NIGHT East winds 10 to 15 knots. Seas 2 to 3 feet. Isolated showers. SATURDAY East winds 10 to 15 knots, increasing to near 15 knots. Seas 2 to 3 feet, building to 3 to 4 feet, occasionally to 5 feet. Scattered showers. SATURDAY NIGHT Northeast to east winds near 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers. SUNDAY Northeast winds 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Scattered showers. SUNDAY NIGHT Northeast winds near 15 knots, increasing to 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet, building to 3 to 5 feet, occasionally to 6 feet. Scattered showers. $$
GMZ052>055-072>075-101530- 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- 1027 PM EST Tue Dec 9 2025 SMALL CRAFT SHOULD EXERCISE CAUTION UNTIL WINDS DECREASE OVERNIGHT Northeast winds 15 to 20 knots early, decreasing to 10 to 15 knots. Seas 3 to 5 feet, occasionally to 6 feet, subsiding to 3 to 4, occasionally to 5 feet. Wave Detail: Northeast to east 4 feet at 5 seconds and northwest 2 feet at 7 seconds. Numerous showers and isolated thunderstorms. WEDNESDAY North to northeast winds near 10 knots, becoming northwest to north and decreasing to 5 to 10 knots. Seas subsiding to 2 to 3 feet. Wave Detail: Northeast to east 3 feet at 6 seconds and northwest 2 feet at 7 seconds. Scattered showers. WEDNESDAY NIGHT Northwest to north winds 5 to 10 knots, increasing to near 10 knots. Seas around 2 feet. Wave Detail: North to northeast 2 feet at 3 seconds and northeast 2 feet at 6 seconds. Isolated showers. THURSDAY North winds near 10 knots. Seas around 2 feet. Isolated showers. THURSDAY NIGHT Northeast winds near 10 knots. Seas around 2 feet. FRIDAY Northeast to east winds 10 to 15 knots. Seas 2 to 3 feet. Isolated showers. FRIDAY NIGHT East winds 10 to 15 knots. Seas 2 to 3 feet. Isolated showers. SATURDAY East winds 10 to 15 knots, increasing to near 15 knots. Seas 2 to 3 feet, building to 3 to 4 feet, occasionally to 5 feet. Scattered showers. SATURDAY NIGHT Northeast to east winds near 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers. SUNDAY Northeast winds 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Scattered showers. SUNDAY NIGHT Northeast winds near 15 knots, increasing to 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet, building to 3 to 5 feet, occasionally to 6 feet. Scattered showers. $$