GMZ005-131445-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
933 PM EST Thu Nov 12 2026
.SYNOPSIS...
Light northwesterly breezes have developed across the Florida Keys
marine zones in advance of an approaching cold front. The front
will pass through the area tomorrow with breezes expected to
freshen in the wake of the front. Small Craft Exercise Caution
headlines and hazards may be required as early as Friday afternoon
and evening. Hazardous winds from this front are not expected to
last very long, but higher seas may take more time to subside.
Even though winds will briefly slacken during the weekend, an
expansive region of high pressure will build over the eastern US
promoting an enhanced pressure gradient across the Florida Keys.
This will likely result in an extended period of strong winds and
higher seas.
The Approximate Shoreward Edge of the Gulf Stream as of November 8,
2026...
30 NM south of Dry Tortugas Light, on Loggerhead Key
38 NM south of Cosgrove Shoal Light, off the Marquesas Keys
46 NM south of Sand Key Light, off Key West
20 NM south of Looe Key, off Big Pine Key
15 NM southeast of Sombrero Key Light, off Marathon
10 NM south of Alligator Reef Light, off Islamorada
8 NM southeast of Molasses Reef Light, off Key Largo
5 NM east of Carysfort Reef Light, off Ocean Reef
Gulf Stream Information Courtesy of the National Weather Service in
Key West, using data from RTOFS and NASA SPoRT SST.
$$
GMZ033-034-131445- Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM out and beyond 5 fathoms- Gulf of America including Dry Tortugas and Rebecca Shoal Channel- 933 PM EST Thu Nov 12 2026 OVERNIGHT Northwest winds 5 to 10 knots, increasing to near 10 knots. Seas 1 foot or less. Wave Detail: Northwest 1 foot at 2 seconds. FRIDAY Northwest to north winds 10 to 15 knots. Seas around 1 foot, building to 2 to 3 feet. Wave Detail: Northwest to north 3 feet at 4 seconds. A slight chance of showers and thunderstorms. FRIDAY NIGHT North winds near 15 knots. Seas around 3 feet. Wave Detail: Northwest to north 3 feet at 5 seconds. SATURDAY North to northeast winds 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. SATURDAY NIGHT North to northeast winds 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Seas 3 to 4 feet, occasionally to 5 feet. SUNDAY NIGHT Northeast to east winds 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. MONDAY Northeast to east winds 20 to 25 knots. Seas 4 to 6 feet, occasionally to 8 feet. A slight chance of showers. MONDAY NIGHT Northeast to east winds 20 to 25 knots. Seas 5 to 7 feet, occasionally to 9 feet. A chance of showers with a slight chance of thunderstorms. TUESDAY Northeast to east winds 20 to 25 knots. Seas 5 to 8 feet, occasionally to 10 feet. A chance of showers with a slight chance of thunderstorms. TUESDAY NIGHT Northeast to east winds 20 to 25 knots. Seas 5 to 7 feet, occasionally to 9 feet. A chance of showers with a slight chance of thunderstorms. $$
GMZ033-034-131445- 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- 933 PM EST Thu Nov 12 2026 OVERNIGHT Northwest winds 5 to 10 knots, increasing to near 10 knots. Seas 1 foot or less. Wave Detail: Northwest 1 foot at 2 seconds. FRIDAY Northwest to north winds 10 to 15 knots. Seas around 1 foot, building to 2 to 3 feet. Wave Detail: Northwest to north 3 feet at 4 seconds. A slight chance of showers and thunderstorms. FRIDAY NIGHT North winds near 15 knots. Seas around 3 feet. Wave Detail: Northwest to north 3 feet at 5 seconds. SATURDAY North to northeast winds 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. SATURDAY NIGHT North to northeast winds 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Seas 3 to 4 feet, occasionally to 5 feet. SUNDAY NIGHT Northeast to east winds 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. MONDAY Northeast to east winds 20 to 25 knots. Seas 4 to 6 feet, occasionally to 8 feet. A slight chance of showers. MONDAY NIGHT Northeast to east winds 20 to 25 knots. Seas 5 to 7 feet, occasionally to 9 feet. A chance of showers with a slight chance of thunderstorms. TUESDAY Northeast to east winds 20 to 25 knots. Seas 5 to 8 feet, occasionally to 10 feet. A chance of showers with a slight chance of thunderstorms. TUESDAY NIGHT Northeast to east winds 20 to 25 knots. Seas 5 to 7 feet, occasionally to 9 feet. A chance of showers with a slight chance of thunderstorms. $$