NWS Marine Forecast


   GMZ005-180830-  Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas  419 PM EDT Mon Aug 17 2026      .SYNOPSIS...  A nebulous flow pattern will support gentle breezes becoming  light and variable at times for the next several days. A Saharan  Air Layer will keep shower and thunderstorm chances at near-nil  through Tuesday night, with only a slight chance of rain and  thunder expected for Wednesday through Saturday.    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.    $$
   GMZ033-034-180830-  Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM  out and beyond 5 fathoms-  Gulf of America including Dry Tortugas and Rebecca Shoal Channel-  419 PM EDT Mon Aug 17 2026    TONIGHT  Variable winds near 5 knots, becoming northwest to  north. Seas 1 foot or less.  TUESDAY  Northwest to north winds 5 to 10 knots. Seas around 1  foot. Wave Detail: Northwest to north 1 foot at 3 seconds.  TUESDAY NIGHT  Northwest to north winds 5 to 10 knots. Seas  around 1 foot. Wave Detail: Northwest to north 1 foot at 3  seconds.  WEDNESDAY  West to northwest winds 5 to 10 knots. Seas 1 to 2  feet. A slight chance of showers and thunderstorms.  WEDNESDAY NIGHT  West to northwest winds 5 to 10 knots,  decreasing to near 5 knots. Seas around 1 foot. A slight chance  of showers and thunderstorms.  THURSDAY  West to northwest winds near 5 knots. Seas around 1  foot. A slight chance of showers and thunderstorms.  THURSDAY NIGHT  Northwest to north winds near 5 knots, becoming  variable. Seas around 1 foot. A slight chance of showers and  thunderstorms.  FRIDAY  South to southwest winds near 5 knots, becoming variable.  Seas around 1 foot. A slight chance of showers.  FRIDAY NIGHT  Variable winds near 5 knots, becoming southeast to  south. Seas around 1 foot. A slight chance of showers and  thunderstorms.  SATURDAY  South to southwest winds near 5 knots, becoming  variable. Seas around 1 foot. A slight chance of showers.  SATURDAY NIGHT  Variable winds near 5 knots, becoming southeast  to south. Seas 1 foot or less. A slight chance of showers and  thunderstorms.    $$