GMZ005-281430-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1025 PM EDT Sun Sep 27 2026
.SYNOPSIS...
A Nor'easter in the vicinity of New Jersey which will continue to
support a northeasterly swell with large periods in the eastern
marine zones through overnight, before subsiding tomorrow. A weak
frontal boundary will begin to push back northward through the
marine zones on Monday. Winds will then clock back to the
southeast to south for early this week, also accompanied by
increasing rain and thunder chances. In addition, strengthening
high pressure is expected to move off the Southeast U.S. coastline
around the middle to latter half of next week, merging with the
Atlantic high. This will promote freshening east to southeast
breezes, potentially become moderate to fresh.
The Approximate Shoreward Edge of the Gulf Stream as of
September 25, 2026...
43 NM south of Dry Tortugas Light, on Loggerhead Key
20 NM south of Cosgrove Shoal Light, off the Marquesas Keys
14 NM south of Sand Key Light, off Key West
7 NM south-southeast of Looe Key, off Big Pine Key
4 NM south-southeast of Sombrero Key Light, off Marathon
4 NM south-southeast of Alligator Reef Light, off Islamorada
0 NM southeast of Molasses Reef Light, off Key Largo
1 NM west-northwest of Carysfort Reef Light, off Ocean Reef
Gulf Stream Information Courtesy of the Naval Oceanographic Office.
$$
GMZ033-034-281430- Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM out and beyond 5 fathoms- Gulf of America including Dry Tortugas and Rebecca Shoal Channel- 1025 PM EDT Sun Sep 27 2026 OVERNIGHT West to northwest winds 5 to 10 knots, becoming variable and decreasing to near 5 knots. Seas around 1 foot. Wave Detail: Northwest to north 1 foot at 4 seconds. MONDAY Variable winds near 5 knots, becoming south. Seas 1 foot or less. Wave Detail: Northwest to north 1 foot at 4 seconds. A slight chance of showers and thunderstorms. MONDAY NIGHT Southeast to south winds near 5 knots. Seas 1 foot or less. Showers likely with a chance of thunderstorms. TUESDAY Southeast winds near 5 knots, increasing to 5 to 10 knots. Seas 1 foot or less, building to around 1 foot. Showers likely with a chance of thunderstorms. TUESDAY NIGHT East to southeast winds 5 to 10 knots. Seas around 1 foot. Showers likely with a chance of thunderstorms. WEDNESDAY East to southeast winds near 10 knots, increasing to 10 to 15 knots. Seas around 1 foot, building to 1 to 2 feet. Showers likely with a chance of thunderstorms. WEDNESDAY NIGHT East winds near 15 knots, increasing 15 to 20 knots. Seas 2 to 3 feet. Showers with a chance of thunderstorms. THURSDAY East to southeast winds 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Showers with a chance of thunderstorms. THURSDAY NIGHT East to southeast winds 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Showers likely with a chance of thunderstorms. FRIDAY East to southeast winds 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. A chance of thunderstorms. Showers likely. FRIDAY NIGHT East to southeast winds near 15 knots. Seas 2 to 3 feet. A chance of showers and thunderstorms. $$
GMZ033-034-281430- 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- 1025 PM EDT Sun Sep 27 2026 OVERNIGHT West to northwest winds 5 to 10 knots, becoming variable and decreasing to near 5 knots. Seas around 1 foot. Wave Detail: Northwest to north 1 foot at 4 seconds. MONDAY Variable winds near 5 knots, becoming south. Seas 1 foot or less. Wave Detail: Northwest to north 1 foot at 4 seconds. A slight chance of showers and thunderstorms. MONDAY NIGHT Southeast to south winds near 5 knots. Seas 1 foot or less. Showers likely with a chance of thunderstorms. TUESDAY Southeast winds near 5 knots, increasing to 5 to 10 knots. Seas 1 foot or less, building to around 1 foot. Showers likely with a chance of thunderstorms. TUESDAY NIGHT East to southeast winds 5 to 10 knots. Seas around 1 foot. Showers likely with a chance of thunderstorms. WEDNESDAY East to southeast winds near 10 knots, increasing to 10 to 15 knots. Seas around 1 foot, building to 1 to 2 feet. Showers likely with a chance of thunderstorms. WEDNESDAY NIGHT East winds near 15 knots, increasing 15 to 20 knots. Seas 2 to 3 feet. Showers with a chance of thunderstorms. THURSDAY East to southeast winds 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Showers with a chance of thunderstorms. THURSDAY NIGHT East to southeast winds 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Showers likely with a chance of thunderstorms. FRIDAY East to southeast winds 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. A chance of thunderstorms. Showers likely. FRIDAY NIGHT East to southeast winds near 15 knots. Seas 2 to 3 feet. A chance of showers and thunderstorms. $$