NWS Marine Forecast


   GMZ005-190900-  Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas  449 PM EDT Sat Jul 18 2026      .SYNOPSIS...A broad area of low pressure over the eastern Gulf of  America will shift northward from tonight through Monday, with  prevailing gentle to moderate south to southeasterly breezes  across Florida Keys coastal waters. An Atlantic high pressure  ridge will extend to the Florida Peninsula for the next several  days. Gentle southeasterly breezes are expected to prevail across  Keys coastal waters Monday night through Thursday, with overnight  surges and afternoon lulls.    The Approximate Shoreward Edge of the Gulf Stream as of  July 17, 2026...    49 NM South of Dry Tortugas Light...on Loggerhead Key.  51 NM South of Cosgrove Shoal Light...off the Marquesas Keys.  38 NM South of Sand Key Light...off Key West.  22 NM South of Looe Key...off Big Pine Key.  13 NM South of Sombrero Key Light...off Marathon.  6 NM Southeast of Alligator Reef Light...off Islamorada.  2 NM Southeast of Molasses Reef Light...off Key Largo.  1 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.    $$
   GMZ033-034-190900-  Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM  out and beyond 5 fathoms-  Gulf of America including Dry Tortugas and Rebecca Shoal Channel-  449 PM EDT Sat Jul 18 2026    TONIGHT  Southeast winds 5 to 10 knots, becoming southeast to  south and increasing to 10 to 15 knots after midnight. Seas 1 to  2 feet. Wave Detail: Southeast 2 feet at 4 seconds and northwest  1 foot at 5 seconds. A chance of showers and thunderstorms.  SUNDAY  Southeast to south winds 10 to 15 knots, becoming south  and decreasing to 5 to 10 knots in the afternoon. Seas 1 to 2  feet. Wave Detail: Southeast 2 feet at 4 seconds and northwest 1  foot at 5 seconds. A chance of showers and thunderstorms.  SUNDAY NIGHT  South winds 5 to 10 knots. Seas around 1 foot.  Wave Detail: Southeast to south 1 foot at 3 seconds and northwest  1 foot at 4 seconds. A chance of showers with a slight chance of  thunderstorms.  MONDAY  South winds 5 to 10 knots. Seas 1 to 2 feet. A chance  of showers with a slight chance of thunderstorms.  MONDAY NIGHT  South winds 5 to 10 knots, becoming southeast  after midnight. Seas around 1 foot.  TUESDAY  Southeast winds 10 to 15 knots, becoming 5 to 10 knots  in the afternoon. Seas 1 to 2 feet.  TUESDAY NIGHT  Southeast winds 5 to 10 knots. Seas around  1 foot.  WEDNESDAY  Southeast winds 5 to 10 knots. Seas around 1 foot.  WEDNESDAY NIGHT  East to southeast winds near 5 knots. Seas  around 1 foot.  THURSDAY  East to southeast winds near 5 knots. Seas 1 foot or  less.  THURSDAY NIGHT  East to southeast winds 5 to 10 knots. Seas  around 1 foot. A slight chance of showers and thunderstorms.    $$