NWS Marine Forecast

   GMZ005-221430-  Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas  1019 PM EDT Mon Sep 21 2026      .SYNOPSIS...  Unsettled weather will persist through the next several days as a  large and broad upper level trough sits across the Gulf waters and  Eastern Seaboard. Breezes outside of convection will generally  remain light to gentle with brief periods of moderate breezes  occurring at times, mainly in the evening and overnight hours.  Towards the end of the week, breezes will shift more northerly as  a frontal boundary gradually pushes southward across coastal  waters of the Florida Keys. Seas will also start to build by the  end of the week and into the weekend as northeasterly swell  increases in the wake of the frontal boundary, 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.    $$

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   GMZ033-034-221430-  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-  1019 PM EDT Mon Sep 21 2026    OVERNIGHT  Southeast to south winds 10 to 15 knots. Seas around  1 foot, building to 1 to 2 feet. Wave Detail: Southeast to south  1 foot at 3 seconds. Showers likely with a chance of  thunderstorms.  TUESDAY  South to southwest winds near 10 knots, decreasing to  5 to 10 knots. Seas 1 to 2 feet, subsiding to around 1 foot. Wave  Detail: Southeast to south 1 foot at 3 seconds. Showers likely  with a chance of thunderstorms.  TUESDAY NIGHT  Southeast to south winds 5 to 10 knots,  increasing to near 10 knots. Seas around 1 foot. Showers with a  chance of thunderstorms.  WEDNESDAY  South winds 5 to 10 knots. Seas around 1 foot.  Showers with a chance of thunderstorms.  WEDNESDAY NIGHT  Southeast to south winds 5 to 10 knots. Seas  1 foot or less. Showers likely with a chance of thunderstorms.  THURSDAY  Southeast to south winds near 5 knots. Seas 1 foot or  less. Showers likely with a chance of thunderstorms.  THURSDAY NIGHT  East winds 5 to 10 knots. Seas 1 foot or less.  A chance of showers and thunderstorms.  FRIDAY  Northeast to east winds 5 to 10 knots. Seas 1 to  2 feet. A chance of showers and thunderstorms.  FRIDAY NIGHT  Northeast to east winds 5 to 10 knots. Seas  around 1 foot. Showers likely with a chance of thunderstorms.  SATURDAY  Northeast to east winds 5 to 10 knots. Seas 1 to  2 feet. A chance of showers and thunderstorms.  SATURDAY NIGHT  Northeast to east winds 5 to 10 knots. Seas  around 1 foot. A chance of showers and thunderstorms.    $$