GMZ005-080900-
 Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
 446 PM EDT Wed Oct 7 2026
 
 
 .SYNOPSIS...Tropical Storm Isaias, currently over the southwestern
 Gulf waters, is expected to move towards the North Gulf Coast
 over the next few days, strengthening as it does so. A cold front
 currently draped across north-central Florida will slowly press
 southward infringing on the surface ridge to its south. In doing
 so, these systems will act in tandem and create a tightening
 pressure gradient across the Keys, resulting in freshening mainly
 southeast breezes as we head into the weekend. In addition,
 moisture will also be on the rise leading to higher rain and
 thunder chances. Any showers and storms will be capable of causing
 hazardous marine conditions through the weekend.
 
 The Approximate Shoreward Edge of the Gulf Stream as of October 2, 2026...
 
 39 NM south-southeast of Dry Tortugas Light, on Loggerhead Key
 14 NM south-southeast of Cosgrove Shoal Light, off the Marquesas Keys
 8 NM south-southeast of Sand Key Light, off Key West
 2 NM south-southeast of Looe Key, off Big Pine Key
 1 NM south-southeast of Sombrero Key Light, off Marathon
 0 NM south-southeast of Alligator Reef Light, off Islamorada
 2 NM northwest of Molasses Reef Light, off Key Largo
 2 NM northwest of Carysfort Reef Light, off Ocean Reef
 
 Gulf Stream Information Courtesy of the Naval Oceanographic Office.
 
 $$




 
 GMZ052>055-072>075-080900-
 Straits of Florida from Ocean Reef to Craig Key out 20 NM-
 Straits of Florida from Craig Key to west end of Seven Mile
 Bridge out 20 NM-
 Straits of Florida from west end of Seven Mile Bridge to south of
 Halfmoon Shoal out 20 NM-
 Straits of Florida from Halfmoon Shoal to 20 NM west of Dry
 Tortugas out 20 NM-
 Straits of Florida from Ocean Reef to Craig Key 20 to 60 NM out-
 Straits of Florida from Craig Key to west end of Seven Mile
 Bridge 20 to 60 NM out-
 Straits of Florida from west end of Seven Mile Bridge to south of
 Halfmoon Shoal 20 to 60 NM out-
 Straits of Florida from Halfmoon Shoal to 20 NM west of Dry
 Tortugas 20 to 60 NM out-
 446 PM EDT Wed Oct 7 2026
 

 TONIGHT
 Southwest winds 5 to 10 knots, becoming south after
 midnight. Seas 1 foot or less. Wave Detail: Southeast to south
 1 foot at 3 seconds. A chance of showers with a slight chance of
 thunderstorms.

 THURSDAY
 South winds near 10 knots, becoming southeast to south
 to 5 to 10 knots. Seas around 1 foot. Wave Detail: South 1 foot at
 3 seconds. A slight chance of showers and thunderstorms.

 THURSDAY NIGHT
 East to southeast winds near 10 knots,
 increasing to 10 to 15 knots. Seas 1 to 2 feet, building to 2 to 3
 feet. Wave Detail: East to southeast 2 feet at 3 seconds. A
 slight chance of showers and thunderstorms.

 FRIDAY
 Southeast winds 10 to 15 knots. Seas 2 to 3 feet,
 building to 3 to 4 feet, occasionally to 5 feet. West of Halfmoon
 Shoal Light, seas 3 to 4 feet, occasionally to 5 feet, building to
 4 to 6 feet, occasionally 8 feet due to a west swell. A chance of
 showers with a slight chance of thunderstorms.

 FRIDAY NIGHT
 Southeast winds 10 to 15 knots. Seas 4 to 5 feet,
 occasionally to 6 feet due to a west swell. Showers likely with a
 chance of thunderstorms.

 SATURDAY
 Southeast winds 10 to 15 knots. Seas 3 to 4 feet,
 occasionally to 5 feet. A chance of showers and thunderstorms.

 SATURDAY NIGHT
 East to southeast winds near 15 knots,
 increasing to 15 to 20 knots. Seas building to 4 to 5 feet,
 occasionally to 6 feet. A chance of showers and thunderstorms.

 SUNDAY
 East to southeast winds 15 to 20 knots, decreasing to
 10 to 15 knots. Seas 4 to 5 feet, occasionally to 6 feet,
 subsiding to 2 to 3 feet.

 SUNDAY NIGHT
 East winds 10 to 15 knots, decreasing to near 10
 knots. Seas 2 to 3 feet, subsiding to around 2 feet.

 MONDAY
 Northeast to east winds 5 to 10 knots. Seas around 2
 feet. A slight chance of showers.

 MONDAY NIGHT
 Northeast to east winds 5 to 10 knots. Seas 1 to 2
 feet. A slight chance of showers.
 
 $$