GMZ005-132015-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
411 AM EDT Thu Aug 13 2026
.SYNOPSIS...A high pressure system in the central North Atlantic
will continue to slide eastward and weaken today. Gentle east to
southeast breezes will slacken, becoming light and variable this
afternoon. As the high restrengthens and builds westward, breezes
will somewhat freshen for Friday through the weekend. A weak
frontal boundary will approach the Florida Peninsula early next
week, allowing breezes to slacken once again, becoming light and
variable at times.
The Approximate Shoreward Edge of the Gulf Stream as of
August 13, 2026...
38 NM South of Dry Tortugas Light...on Loggerhead Key.
20 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
17 NM South of Sand Key Light...off Key West.
21 NM South of Looe Key...off Big Pine Key.
18 NM Southeast of Sombrero Key Light...off Marathon.
7 NM Southeast of Alligator Reef Light...off Islamorada.
7 NM Southeast of Molasses Reef Light...off Key Largo.
2 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.
$$
GMZ033-034-132015- Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM out and beyond 5 fathoms- Gulf of America including Dry Tortugas and Rebecca Shoal Channel- 411 AM EDT Thu Aug 13 2026 TODAY Northeast to east winds near 5 knots, becoming variable. Seas 1 foot or less. Wave Detail: Northwest to north 1 foot at 3 seconds. A chance of showers with a slight chance of thunderstorms. TONIGHT Northeast to east winds 5 to 10 knots, becoming east to southeast and increasing to near 10 knots. Seas around 1 foot. A slight chance of showers and thunderstorms. FRIDAY Northeast to to east winds 5 to 10 knots. Seas around 1 foot. Wave Detail: East to southeast 1 foot at 3 seconds. A chance of showers and thunderstorms. FRIDAY NIGHT East winds near 10 knots, increasing to 10 to 15 knots. Seas 1 to 2 feet, building to around 2 feet. A chance of showers and thunderstorms. SATURDAY East to southeast winds near 10 knots. Seas around 2 feet. A chance of showers and thunderstorms. SATURDAY NIGHT East to southeast winds near 10 knots, increasing to 10 to 15 knots. Seas around 2 feet, building to 2 to 3 feet. A chance of showers with a slight chance of thunderstorms. SUNDAY East to southeast winds near 10 knots, decreasing to 5 to 10 knots. Seas around 2 feet, subsiding to 1 to 2 feet. A chance of thunderstorms with a slight chance of showers. SUNDAY NIGHT East to southeast winds 5 to 10 knots. Seas 1 to 2 feet. MONDAY Northeast to east winds 5 to 10 knots. Seas 1 to 2 feet. A slight chance of showers. MONDAY NIGHT North to northeast winds 5 to 10 knots. Seas around 1 foot. A slight chance of showers and thunderstorms. $$
GMZ033-034-132015- 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- 411 AM EDT Thu Aug 13 2026 TODAY Northeast to east winds near 5 knots, becoming variable. Seas 1 foot or less. Wave Detail: Northwest to north 1 foot at 3 seconds. A chance of showers with a slight chance of thunderstorms. TONIGHT Northeast to east winds 5 to 10 knots, becoming east to southeast and increasing to near 10 knots. Seas around 1 foot. A slight chance of showers and thunderstorms. FRIDAY Northeast to to east winds 5 to 10 knots. Seas around 1 foot. Wave Detail: East to southeast 1 foot at 3 seconds. A chance of showers and thunderstorms. FRIDAY NIGHT East winds near 10 knots, increasing to 10 to 15 knots. Seas 1 to 2 feet, building to around 2 feet. A chance of showers and thunderstorms. SATURDAY East to southeast winds near 10 knots. Seas around 2 feet. A chance of showers and thunderstorms. SATURDAY NIGHT East to southeast winds near 10 knots, increasing to 10 to 15 knots. Seas around 2 feet, building to 2 to 3 feet. A chance of showers with a slight chance of thunderstorms. SUNDAY East to southeast winds near 10 knots, decreasing to 5 to 10 knots. Seas around 2 feet, subsiding to 1 to 2 feet. A chance of thunderstorms with a slight chance of showers. SUNDAY NIGHT East to southeast winds 5 to 10 knots. Seas 1 to 2 feet. MONDAY Northeast to east winds 5 to 10 knots. Seas 1 to 2 feet. A slight chance of showers. MONDAY NIGHT North to northeast winds 5 to 10 knots. Seas around 1 foot. A slight chance of showers and thunderstorms. $$