NWS Marine Forecast


   GMZ005-200845-  Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas  443 PM EDT Sat Sep 19 2026      .SYNOPSIS...  Light to gentle breezes will continue through the weekend, with  variable winds this evening gradually shifting to the southeast  to south, then eventually to the south to southwest through  Sunday. A wet weather pattern will persist across the Florida  Keys coastal waters through early next week, as an upper- level  low retrogrades westward into the Gulf. As a result, scattered to  numerous showers and thunderstorms will be a daily occurence,  with gusty winds, lightning strikes, blinding downpours, and  locally hazardous seas being the main hazards mariners could  encounter in the vicinity of this activity. The upper-level low is  forecast to move out of the area early next week, but lingering  moisture is likely to persist through at least Wednesday.    The Approximate Shoreward Edge of the Gulf Stream as of September  15, 2026...    64 NM south-southeast of Dry Tortugas Light, on Loggerhead Key  40 NM south-southeast of Cosgrove Shoal Light, off the Marquesas Keys  36 NM south-southeast of Sand Key Light, off Key West  35 NM southeast of Looe Key, off Big Pine Key  28 NM southeast of Sombrero Key Light, off Marathon  15 NM east-southeast of Alligator Reef Light, off Islamorada  8 NM east-southeast of Molasses Reef Light, off Key Largo  5 NM east-southeast of Carysfort Reef Light, off Ocean Reef    Gulf Stream Information Courtesy of the Naval Oceanographic Office.    $$
   GMZ033-034-200845-  Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM  out and beyond 5 fathoms-  Gulf of America including Dry Tortugas and Rebecca Shoal Channel-  443 PM EDT Sat Sep 19 2026    TONIGHT  Variable winds near 5 knots, becoming southeast to  south. Seas 1 foot or less. Wave Detail: East 1 foot at 2  seconds. Showers likely with a chance of thunderstorms. Winds and  seas higher in the vicinity of any thunderstorm.  SUNDAY  South winds near 5 knots. Seas 1 foot or less. Wave  Detail: South 1 foot at 2 seconds. Showers likely with a chance  of thunderstorms.  SUNDAY NIGHT  Southeast to south winds near 5 knots, increasing  to near 10 knots. Seas building to around 1 foot. Wave Detail:  South 1 foot at 3 seconds. Showers likely with a chance of  thunderstorms.  MONDAY  South to southwest winds near 5 knots. Seas 1 foot or  less. Showers likely with a chance of thunderstorms.  MONDAY NIGHT  South winds 5 to 10 knots. Seas around 1 foot.  Showers likely with a chance of thunderstorms.  TUESDAY  South winds near 5 knots, becoming southeast to south  and increasing to 5 to 10 knots. Seas around 1 foot. Showers  likely with a chance of thunderstorms.  TUESDAY NIGHT  Southeast to south winds 5 to 10 knots. Seas  around 1 foot. A chance of thunderstorms. Showers likely.  WEDNESDAY  Southeast winds near 5 knots. Seas around 1 foot.  Showers likely with a chance of thunderstorms.  WEDNESDAY NIGHT THROUGH THURSDAY NIGHT  East to southeast winds  5 to 10 knots. Seas around 1 foot. A chance of showers with a  slight chance of thunderstorms.    $$