NWS Marine Forecast


   GMZ005-010830-  Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas  417 PM EDT Wed Sep 30 2026      .SYNOPSIS...  High pressure offshore the Eastern Seaboard will merge with an  existing high pressure across the subtropical Atlantic, and  subsequently build through the remainder of the week. Breezes will  increase, becoming moderate to fresh tonight and continuing  through late week. Widespread exercise caution headlines will be  necesary through at least Friday, with Small Craft Advisories  likely required the Straits of Florida. In addition, a very wet  pattern will remain across the Keys over the next couple days,  resulting in periods of scattered to numerous showers and  thunderstorms.    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.    $$
   GMZ033-034-010830-  Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM  out and beyond 5 fathoms-  Gulf of America including Dry Tortugas and Rebecca Shoal Channel-  417 PM EDT Wed Sep 30 2026    SMALL CRAFT SHOULD EXERCISE CAUTION    TONIGHT  East to southeast winds 15 to 20 knots. Seas 2 to  4 feet, occasionally to 5 feet. Wave Detail: East to southeast  4 feet at 4 seconds. Showers with a chance of thunderstorms.  THURSDAY  East to southeast winds 15 to 20 knots. Seas 3 to 5  feet, occasionally to 6 feet. Wave Detail: East to southeast 5  feet at 5 seconds. Showers with a chance of thunderstorms.  THURSDAY NIGHT  East to southeast winds 15 to 20 knots. Seas 3  to 5 feet, occasionally to 6 feet. Wave Detail: East to southeast  5 feet at 5 seconds. Showers likely with a chance of  thunderstorms.  FRIDAY  East to southeast winds 15 to 20 knots. Seas 3 to  5 feet, occasionally to 6 feet. Showers likely with a chance of  thunderstorms.  FRIDAY NIGHT AND SATURDAY  East to southeast winds 15 to 20  knots. Seas 3 to 4 feet, occasionally to 5 feet. A chance of  showers and thunderstorms.  SATURDAY NIGHT  East to southeast winds near 15 knots. Seas 2  to 3 feet. A chance of showers and thunderstorms.  SUNDAY  East to southeast winds 10 to 15 knots. Seas 2 to  4 feet, occasionally to 5 feet. A chance of showers and  thunderstorms.  SUNDAY NIGHT  East to southeast winds near 10 knots. Seas 2 to  3 feet. A chance of showers and thunderstorms.  MONDAY AND MONDAY NIGHT  Southeast winds 5 to 10 knots. Seas 1  to 2 feet. A chance of showers and thunderstorms.    $$