NWS Marine Forecast


   GMZ005-172030-  Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas  419 AM EDT Mon Aug 17 2026      .SYNOPSIS...A col region is setting up across the Florida Keys  early this week. Generally gentle east to southeasterly breezes  will become light and variable at times during the week.  Westerlies are possible later this week in the event the col  region is forced south towards Cuba. A Saharan Air Layer will keep  showers suppressed during the first half of the week.    The Approximate Shoreward Edge of the Gulf Stream as of  August 13, 2026...    38 NM South of Dry Tortugas Light...on Loggerhead Key.  20 NM South of Cosgrove Shoal Light...off the Marquesas Keys.  17 NM South of Sand Key Light...off Key West.  21 NM South of Looe Key...off Big Pine Key.  18 NM Southeast of Sombrero Key Light...off Marathon.  7 NM Southeast of Alligator Reef Light...off Islamorada.  7 NM Southeast of Molasses Reef Light...off Key Largo.  2 NM Southeast of Carysfort Reef Light...off Ocean Reef.    Gulf Stream Information Courtesy of the National Weather Service in  Key West, using data from RTOFS and NASA SPoRT SST.    $$
   GMZ033-034-172030-  Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM  out and beyond 5 fathoms-  Gulf of America including Dry Tortugas and Rebecca Shoal Channel-  419 AM EDT Mon Aug 17 2026    TODAY  East winds 5 to 10 knots, becoming north to northeast  near 5 knots. Seas around 1 foot. Wave Detail: East to southeast  1 foot at 3 seconds.  TONIGHT  North to northeast winds near 5 knots. Seas 1 foot or  less.  TUESDAY  Northwest to north winds 5 to 10 knots. Seas 1 foot or  less. Wave Detail: Northwest to north 1 foot at 3 seconds.  TUESDAY NIGHT  Northwest to north winds 5 to 10 knots. Seas  around 1 foot.  WEDNESDAY  West to northwest winds 5 to 10 knots. Seas 1 to 2  feet. A slight chance of showers and thunderstorms.  WEDNESDAY NIGHT  West to northwest winds 5 to 10 knots,  decreasing to near 5 knots. Seas 1 to 2 feet. A slight chance of  showers and thunderstorms.  THURSDAY  West to northwest winds near 5 knots. Seas 1 to  2 feet. A slight chance of showers and thunderstorms.  THURSDAY NIGHT  Northwest to north winds near 5 knots, becoming  variable. Seas 1 to 2 feet. A slight chance of showers and  thunderstorms.  FRIDAY  Southeast to south winds near 5 knots. Seas around  1 foot. A slight chance of showers.  FRIDAY NIGHT  East to southeast winds near 5 knots. Seas around  1 foot. A slight chance of showers and thunderstorms.    $$