NWS Marine Forecast


   GMZ005-220830-  Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas  1028 PM EDT Tue Jul 21 2026      .SYNOPSIS...As of 8 PM EDT, Tropical Storm Bertha was centered  over the northern Gulf waters. Bertha is expected to continue  moving slowly to the west-northwest or west tonight through  Friday, moving Tropical Storm Berth near or along the northern  Gulf coast. Otherwise, an Atlantic ridge of high pressure will  extend to the Florida Peninsula for the next several days.  Gentle breezes will briefly become moderate overnight through  early Thursday, then gradually slacken to light to gentle breezes  by Friday, peaking overnight and lull during the day. Light winds  are expected this weekend.      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.    $$
   GMZ033-034-220830-  Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM  out and beyond 5 fathoms-  Gulf of America including Dry Tortugas and Rebecca Shoal Channel-  1028 PM EDT Tue Jul 21 2026    OVERNIGHT  Southeast to south winds near 10 knots, becoming  southeast and increasing to 10 to 15 knots. Seas 2 to 3 feet.  Wave Detail: West to northwest 3 feet at 7 seconds and southeast  2 feet at 4 seconds.  WEDNESDAY  Southeast winds 10 to 15 knots. Seas 2 to 3 feet.  Wave Detail: Southeast 2 feet at 4 seconds and west 2 feet at  6 seconds. A slight chance of showers and thunderstorms.  WEDNESDAY NIGHT  East to southeast winds 10 to 15 knots. Seas  2 to 3 feet. Wave Detail: East to southeast 2 feet at 4 seconds  and west 2 feet at 7 seconds. A slight chance of showers and  thunderstorms.  THURSDAY  East winds near 10 knots, decreasing to 5 to 10  knots. Seas 2 to 3 feet. A slight chance of showers and  thunderstorms.  THURSDAY NIGHT  Northeast to east winds 5 to 10 knots. Seas  around 2 feet. A chance of showers and thunderstorms.  FRIDAY  East winds 5 to 10 knots. Seas 1 to 2 feet. A chance of  showers and thunderstorms.  FRIDAY NIGHT  East to southeast winds 5 to 10 knots. Seas 1 to  2 feet. A slight chance of showers and thunderstorms.  SATURDAY  Southeast to south winds near 5 knots. Seas around  1 foot.  SATURDAY NIGHT  North to northeast winds near 5 knots, becoming  south after midnight. Seas around 1 foot.  SUNDAY  Northwest winds near 5 knots. Seas around 1 foot. A  slight chance of showers.  SUNDAY NIGHT  Northwest winds 5 to 10 knots. Seas 1 foot or  less. A slight chance of showers and thunderstorms.    $$