GMZ005-231445-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1031 PM EDT Tue Sep 22 2026
.SYNOPSIS...
Unsettled weather will persist through the next several days as
deep tropical moisture lingers across the region, which will
support scattered to numerous showers and thunderstorms at times.
Breezes outside of convection will generally remain light to
gentle out of the south the next several days with brief periods
of moderate breezes, mainly in the evening and overnight hours.
Winds briefly become light and variable on Thursday before
shifting more northerly in the wake of a frontal boundary that is
forecast to push southward across Keys waters late in the week.
In addition, seas will also start to build by the end of the week
and into the weekend as northerly swells build following the
frontal passage, especially in the Straits of Florida.
The Approximate Shoreward Edge of the Gulf Stream as of September
15, 2026...
64 NM south-southeast of Dry Tortugas Light, on Loggerhead Key
40 NM south-southeast of Cosgrove Shoal Light, off the Marquesas Keys
36 NM south-southeast of Sand Key Light, off Key West
35 NM southeast of Looe Key, off Big Pine Key
28 NM southeast of Sombrero Key Light, off Marathon
15 NM east-southeast of Alligator Reef Light, off Islamorada
8 NM east-southeast of Molasses Reef Light, off Key Largo
5 NM east-southeast of Carysfort Reef Light, off Ocean Reef
Gulf Stream Information Courtesy of the Naval Oceanographic Office.
$$
GMZ033-034-231445- Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM out and beyond 5 fathoms- Gulf of America including Dry Tortugas and Rebecca Shoal Channel- 1031 PM EDT Tue Sep 22 2026 OVERNIGHT Southeast to south winds near 10 knots. Seas 1 to 2 feet. Showers likely with a chance of thunderstorms. WEDNESDAY South to southwest winds 5 to 10 knots, becoming variable near 5 knots. Seas around 1 foot. Showers likely with a chance of thunderstorms. WEDNESDAY NIGHT Variable winds near 5 knots. Seas 1 foot or less. A chance of showers and thunderstorms. THURSDAY Northwest to north winds 5 to 10 knots. Seas around 1 foot. A chance of showers and thunderstorms. THURSDAY NIGHT Northwest to north winds 5 to 10 knots, becoming north to northeast 10 to 15 knots. Seas around 1 foot, building to 1 to 2 feet due to a northwest swell. A chance of showers and thunderstorms. FRIDAY North to northeast winds 10 to 15 knots. Seas 2 to 3 feet due to a northwest swell. A chance of showers and thunderstorms. FRIDAY NIGHT Northeast winds 10 to 15 knots. Seas 2 to 3 feet due to a northwest swell. A chance of showers with a slight chance of thunderstorms. SATURDAY Northeast winds 10 to 15 knots, decreasing to near 10 knots. Seas 2 to 3 feet due to a northwest swell. A chance of thunderstorms with a slight chance of showers. SATURDAY NIGHT North to northeast winds near 10 knots. Seas 1 to 2 feet. A chance of showers with a slight chance of thunderstorms. SUNDAY Northeast winds 5 to 10 knots. Seas 1 to 2 feet. A chance of showers and thunderstorms. SUNDAY NIGHT Northeast winds 5 to 10 knots. Seas 1 to 2 feet, subsiding to around 1 foot. A chance of showers and thunderstorms. $$
GMZ033-034-231445- 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- 1031 PM EDT Tue Sep 22 2026 OVERNIGHT Southeast to south winds near 10 knots. Seas 1 to 2 feet. Showers likely with a chance of thunderstorms. WEDNESDAY South to southwest winds 5 to 10 knots, becoming variable near 5 knots. Seas around 1 foot. Showers likely with a chance of thunderstorms. WEDNESDAY NIGHT Variable winds near 5 knots. Seas 1 foot or less. A chance of showers and thunderstorms. THURSDAY Northwest to north winds 5 to 10 knots. Seas around 1 foot. A chance of showers and thunderstorms. THURSDAY NIGHT Northwest to north winds 5 to 10 knots, becoming north to northeast 10 to 15 knots. Seas around 1 foot, building to 1 to 2 feet due to a northwest swell. A chance of showers and thunderstorms. FRIDAY North to northeast winds 10 to 15 knots. Seas 2 to 3 feet due to a northwest swell. A chance of showers and thunderstorms. FRIDAY NIGHT Northeast winds 10 to 15 knots. Seas 2 to 3 feet due to a northwest swell. A chance of showers with a slight chance of thunderstorms. SATURDAY Northeast winds 10 to 15 knots, decreasing to near 10 knots. Seas 2 to 3 feet due to a northwest swell. A chance of thunderstorms with a slight chance of showers. SATURDAY NIGHT North to northeast winds near 10 knots. Seas 1 to 2 feet. A chance of showers with a slight chance of thunderstorms. SUNDAY Northeast winds 5 to 10 knots. Seas 1 to 2 feet. A chance of showers and thunderstorms. SUNDAY NIGHT Northeast winds 5 to 10 knots. Seas 1 to 2 feet, subsiding to around 1 foot. A chance of showers and thunderstorms. $$