GMZ005-232100-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
447 AM EDT Wed Sep 23 2026
.SYNOPSIS...
Unsettled weather will persist through the next few 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 overnight and early morning hours. Winds
briefly become light and variable on Thursday before taking on a
northerly heading in the wake of a frontal boundary that is
forecast to push southward across the 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 eastern 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.
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