NWS Marine Forecast


   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.    $$
   GMZ033-034-270830-  Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM  out and beyond 5 fathoms-  Gulf of America including Dry Tortugas and Rebecca Shoal Channel-  426 PM EDT Sat Sep 26 2026    TONIGHT  North to northeast winds 5 to 10 knots. Seas 1 to 2  feet, subsiding to around 1 foot. Wave Detail: Northwest to north  1 foot at 5 seconds.  SUNDAY  North to northwest winds near 5 knots. Seas around 1  foot. Wave Detail: Northwest to north 1 foot at 4 seconds.  SUNDAY NIGHT  West winds near 5 knots. Seas 1 foot or less. Wave  Detail: Northwest to north 1 foot at 4 seconds. A slight chance  of showers.  MONDAY  South to southwest winds near 5 knots. Seas 1 foot or  less. A chance of showers with a slight chance of thunderstorms.  MONDAY NIGHT  South winds near 5 knots. Seas 1 foot or less,  building to around 1 foot. Showers likely with a chance of  thunderstorms.  TUESDAY  Southeast winds near 5 knots, increasing to 5 to 10  knots. Seas around 1 foot. Showers with a chance of  thunderstorms.  TUESDAY NIGHT  Southeast winds 5 to 10 knots. Seas around  1 foot. Showers with a chance of thunderstorms.  WEDNESDAY  East to southeast winds 5 to 10 knots, increasing to  near 10 knots. Seas around 1 foot, building 1 to 2 feet. Showers  likely with a chance of thunderstorms.  WEDNESDAY NIGHT  East to southeast winds 10 to 15 knots. Seas  1 to 2 feet, building to 2 to 3 feet. Showers likely with a  chance of thunderstorms.  THURSDAY  East to southeast winds near 15 knots. Seas 2 to  3 feet. Showers likely with a chance of thunderstorms.  THURSDAY NIGHT  East to southeast winds 15 to 20 knots. Seas  2 to 4 feet, occasionally to 5 feet. Showers likely with a chance  of thunderstorms.    $$