GMZ005-201430-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1027 PM EDT Sat Sep 19 2026
.SYNOPSIS...
Light to gentle breezes will continue through the weekend, with
variable winds during the overnight hours gradually shifting to
the southeast to south, then eventually to the south to southwest
through the rest of 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.
$$
GMZ052>055-072>075-201430- 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- 1027 PM EDT Sat Sep 19 2026 OVERNIGHT Variable winds 5 to 10 knots, becoming southeast to south. Seas 1 to 2 feet. Wave Detail: East to southeast 1 foot at 4 seconds. Showers likely with a chance of thunderstorms. Winds and seas higher in the vicinity of any thunderstorm. SUNDAY South to southwest winds near 5 knots. Seas around 1 foot. Wave Detail: Southeast 1 foot at 4 seconds. A chance of showers and thunderstorms. SUNDAY NIGHT South winds 5 to 10 knots. Seas 1 to 2 feet. Wave Detail: Southeast to south 1 foot at 3 seconds.Showers likely with a chance of thunderstorms. MONDAY South to southwest winds 5 to 10 knots. Seas 1 to 2 feet. Showers likely with a chance of thunderstorms. MONDAY NIGHT Southeast to south winds 5 to 10 knots. Seas 1 to 2 feet. A chance of showers and thunderstorms. TUESDAY Southeast to south winds 5 to 10 knots. Seas 1 to 2 feet. Showers likely with a chance of thunderstorms. TUESDAY NIGHT Southeast winds 5 to 10 knots. Seas 1 to 2 feet. Showers likely with a chance of thunderstorms. WEDNESDAY Southeast to south winds 5 to 10 knots. Seas 1 to 2 feet. Showers likely with a chance of thunderstorms. WEDNESDAY NIGHT Southeast to south winds 5 to 10 knots. Seas 1 to 2 feet. A chance of showers with a slight chance of thunderstorms. THURSDAY AND THURSDAY NIGHT Southeast winds 5 to 10 knots. Seas 1 to 2 feet. A chance of showers with a slight chance of thunderstorms. $$
GMZ052>055-072>075-201430- 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- 1027 PM EDT Sat Sep 19 2026 OVERNIGHT Variable winds 5 to 10 knots, becoming southeast to south. Seas 1 to 2 feet. Wave Detail: East to southeast 1 foot at 4 seconds. Showers likely with a chance of thunderstorms. Winds and seas higher in the vicinity of any thunderstorm. SUNDAY South to southwest winds near 5 knots. Seas around 1 foot. Wave Detail: Southeast 1 foot at 4 seconds. A chance of showers and thunderstorms. SUNDAY NIGHT South winds 5 to 10 knots. Seas 1 to 2 feet. Wave Detail: Southeast to south 1 foot at 3 seconds.Showers likely with a chance of thunderstorms. MONDAY South to southwest winds 5 to 10 knots. Seas 1 to 2 feet. Showers likely with a chance of thunderstorms. MONDAY NIGHT Southeast to south winds 5 to 10 knots. Seas 1 to 2 feet. A chance of showers and thunderstorms. TUESDAY Southeast to south winds 5 to 10 knots. Seas 1 to 2 feet. Showers likely with a chance of thunderstorms. TUESDAY NIGHT Southeast winds 5 to 10 knots. Seas 1 to 2 feet. Showers likely with a chance of thunderstorms. WEDNESDAY Southeast to south winds 5 to 10 knots. Seas 1 to 2 feet. Showers likely with a chance of thunderstorms. WEDNESDAY NIGHT Southeast to south winds 5 to 10 knots. Seas 1 to 2 feet. A chance of showers with a slight chance of thunderstorms. THURSDAY AND THURSDAY NIGHT Southeast winds 5 to 10 knots. Seas 1 to 2 feet. A chance of showers with a slight chance of thunderstorms. $$