GMZ005-300930-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
418 PM EST Mon Dec 29 2025
.SYNOPSIS...High pressure will shift south through the eastern
Gulf tonight as a cold front approaches South Florida resulting
in northwest breezes. The front is expected to push southeastwards
across Keys waters Tuesday and Tuesday night. This will lead to
freshening northerly breezes throughout all the Florida Keys
coastal waters, with our easternmost waters likely holding off
until late Tuesday. Small Craft Advisories are becoming
increasingly likely for portions of Keys waters on Tuesday into
Tuesday night.
The Approximate Shoreward Edge of the Gulf Stream as of December
27...
18 NM South of Dry Tortugas Light...on Loggerhead Key.
11 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
12 NM South of Sand Key Light...off Key West.
12 NM South of Looe Key...off Big Pine Key.
13 NM Southeast of Sombrero Key Light...off Marathon.
8 NM Southeast of Alligator Reef Light...off Islamorada.
2 NM Southeast of Molasses Reef Light...off Key Largo.
2 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.
$$
GMZ053>055-073>075-300930- Straits of Florida from Craig Key to west end of Seven Mile Bridge out 20 NM- Straits of Florida from west end of Seven Mile Bridge to south of Halfmoon Shoal out 20 NM- Straits of Florida from Halfmoon Shoal to 20 NM west of Dry Tortugas out 20 NM- Straits of Florida from Craig Key to west end of Seven Mile Bridge 20 to 60 NM out- Straits of Florida from west end of Seven Mile Bridge to south of Halfmoon Shoal 20 to 60 NM out- Straits of Florida from Halfmoon Shoal to 20 NM west of Dry Tortugas 20 to 60 NM out- 418 PM EST Mon Dec 29 2025 SMALL CRAFT ADVISORY MAY BE REQUIRED TUESDAY TONIGHT Northwest to north winds 5 to 10 knots, increasing to near 10 knots. Seas around 1 foot. Wave Detail: Northeast to east 1 foot at 4 seconds. Isolated showers. TUESDAY Northwest to north winds increasing to near 20 knots early. Seas 2 to 3 feet, building to 3 to 5 feet, occasionally to 6 feet in the afternoon. Wave Detail: Northeast 1 foot at 4 seconds, becoming north to northeast 1 foot at 3 seconds. Isolated showers. TUESDAY NIGHT North winds near 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: North 3 feet at 4 seconds. WEDNESDAY North winds 15 to 20 knots, decreasing to 10 to 15 knots in the afternoon. Seas 4 to 6 feet, occasionally to 7 feet, subsiding to 3 to 4 feet, occasionally to 5 feet. WEDNESDAY NIGHT North winds 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. THURSDAY North winds 10 to 15 knots, decreasing to near 10 knots. Seas 2 to 3 feet. THURSDAY NIGHT North to northeast winds near 10 knots. Seas 1 to 2 feet. FRIDAY Northeast winds 5 to 10 knots. Seas 1 to 2 feet. FRIDAY NIGHT East winds 5 to 10 knots. Seas 1 to 2 feet. SATURDAY Southeast to south winds near 5 knots, becoming southwest in the afternoon. Seas around 1 foot. SATURDAY NIGHT West winds 5 to 10 knots. Seas 1 foot or less. $$
GMZ053>055-073>075-300930- 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 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- 418 PM EST Mon Dec 29 2025 SMALL CRAFT ADVISORY MAY BE REQUIRED TUESDAY TONIGHT Northwest to north winds 5 to 10 knots, increasing to near 10 knots. Seas around 1 foot. Wave Detail: Northeast to east 1 foot at 4 seconds. Isolated showers. TUESDAY Northwest to north winds increasing to near 20 knots early. Seas 2 to 3 feet, building to 3 to 5 feet, occasionally to 6 feet in the afternoon. Wave Detail: Northeast 1 foot at 4 seconds, becoming north to northeast 1 foot at 3 seconds. Isolated showers. TUESDAY NIGHT North winds near 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: North 3 feet at 4 seconds. WEDNESDAY North winds 15 to 20 knots, decreasing to 10 to 15 knots in the afternoon. Seas 4 to 6 feet, occasionally to 7 feet, subsiding to 3 to 4 feet, occasionally to 5 feet. WEDNESDAY NIGHT North winds 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. THURSDAY North winds 10 to 15 knots, decreasing to near 10 knots. Seas 2 to 3 feet. THURSDAY NIGHT North to northeast winds near 10 knots. Seas 1 to 2 feet. FRIDAY Northeast winds 5 to 10 knots. Seas 1 to 2 feet. FRIDAY NIGHT East winds 5 to 10 knots. Seas 1 to 2 feet. SATURDAY Southeast to south winds near 5 knots, becoming southwest in the afternoon. Seas around 1 foot. SATURDAY NIGHT West winds 5 to 10 knots. Seas 1 foot or less. $$