GMZ005-270830-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
426 PM EDT Sat Sep 26 2026
.SYNOPSIS...
An early season cold front will remain draped across the distant
Straits of Florida for much of the weekend, supporting light to
gentle northerlies. A Nor'easter off the Eastern Seaboard will
support a northeasterly swell with large periods in the eastern
marine zones through Sunday. The front will push back northward
through the marine zones on Monday. Winds will then clock back
around to the southeast to south for early next week, also
accompanied by increasing rain and thunder chances.
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.
$$
GMZ033-034-270830- Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM out and beyond 5 fathoms- Gulf of America including Dry Tortugas and Rebecca Shoal Channel- 426 PM EDT Sat Sep 26 2026 TONIGHT North to northeast winds 5 to 10 knots. Seas 1 to 2 feet, subsiding to around 1 foot. Wave Detail: Northwest to north 1 foot at 5 seconds. SUNDAY North to northwest winds near 5 knots. Seas around 1 foot. Wave Detail: Northwest to north 1 foot at 4 seconds. SUNDAY NIGHT West winds near 5 knots. Seas 1 foot or less. Wave Detail: Northwest to north 1 foot at 4 seconds. A slight chance of showers. MONDAY South to southwest winds near 5 knots. Seas 1 foot or less. A chance of showers with a slight chance of thunderstorms. MONDAY NIGHT South winds near 5 knots. Seas 1 foot or less, building to around 1 foot. Showers likely with a chance of thunderstorms. TUESDAY Southeast winds near 5 knots, increasing to 5 to 10 knots. Seas around 1 foot. Showers with a chance of thunderstorms. TUESDAY NIGHT Southeast winds 5 to 10 knots. Seas around 1 foot. Showers with a chance of thunderstorms. WEDNESDAY East to southeast winds 5 to 10 knots, increasing to near 10 knots. Seas around 1 foot, building 1 to 2 feet. Showers likely with a chance of thunderstorms. WEDNESDAY NIGHT East to southeast winds 10 to 15 knots. Seas 1 to 2 feet, building to 2 to 3 feet. Showers likely with a chance of thunderstorms. THURSDAY East to southeast winds near 15 knots. Seas 2 to 3 feet. Showers likely with a chance of thunderstorms. THURSDAY NIGHT East to southeast winds 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. Showers likely with a chance of thunderstorms. $$
GMZ033-034-270830- 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- 426 PM EDT Sat Sep 26 2026 TONIGHT North to northeast winds 5 to 10 knots. Seas 1 to 2 feet, subsiding to around 1 foot. Wave Detail: Northwest to north 1 foot at 5 seconds. SUNDAY North to northwest winds near 5 knots. Seas around 1 foot. Wave Detail: Northwest to north 1 foot at 4 seconds. SUNDAY NIGHT West winds near 5 knots. Seas 1 foot or less. Wave Detail: Northwest to north 1 foot at 4 seconds. A slight chance of showers. MONDAY South to southwest winds near 5 knots. Seas 1 foot or less. A chance of showers with a slight chance of thunderstorms. MONDAY NIGHT South winds near 5 knots. Seas 1 foot or less, building to around 1 foot. Showers likely with a chance of thunderstorms. TUESDAY Southeast winds near 5 knots, increasing to 5 to 10 knots. Seas around 1 foot. Showers with a chance of thunderstorms. TUESDAY NIGHT Southeast winds 5 to 10 knots. Seas around 1 foot. Showers with a chance of thunderstorms. WEDNESDAY East to southeast winds 5 to 10 knots, increasing to near 10 knots. Seas around 1 foot, building 1 to 2 feet. Showers likely with a chance of thunderstorms. WEDNESDAY NIGHT East to southeast winds 10 to 15 knots. Seas 1 to 2 feet, building to 2 to 3 feet. Showers likely with a chance of thunderstorms. THURSDAY East to southeast winds near 15 knots. Seas 2 to 3 feet. Showers likely with a chance of thunderstorms. THURSDAY NIGHT East to southeast winds 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. Showers likely with a chance of thunderstorms. $$