GMZ005-160845-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
433 PM EDT Sat Aug 15 2026
.SYNOPSIS...Gentle to moderate east to southeast breezes across
the Florida Keys will start to slacken before the start of the
work week. The subtropical ridge is expected to weaken as a mid
latitude trough descends into the Atlantic from the eastern United
States. Periods of light and variable breezes are possible early
next week as a result. Meanwhile, a Saharan Air Layer is forecast
to move across the Keys waters early next week. There is high
confidence shower coverage will be low for most of the forecast
period.
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.
$$
GMZ052>055-072>075-160845- Straits of Florida from Ocean Reef to Craig Key out 20 NM- Straits of Florida from Craig Key to west end of Seven Mile Bridge out 20 NM- Straits of Florida from west end of Seven Mile Bridge to south of Halfmoon Shoal out 20 NM- Straits of Florida from Halfmoon Shoal to 20 NM west of Dry Tortugas out 20 NM- Straits of Florida from Ocean Reef to Craig Key 20 to 60 NM out- Straits of Florida from Craig Key to west end of Seven Mile Bridge 20 to 60 NM out- Straits of Florida from west end of Seven Mile Bridge to south of Halfmoon Shoal 20 to 60 NM out- Straits of Florida from Halfmoon Shoal to 20 NM west of Dry Tortugas 20 to 60 NM out- 433 PM EDT Sat Aug 15 2026 TONIGHT East to southeast winds near 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 5 seconds. SUNDAY East to southeast winds 10 to 15 knots. Seas 2 to 3 feet. Wave Detail: East 3 feet at 5 seconds. SUNDAY NIGHT East winds 10 to 15 knots. Seas 2 to 3 feet. Wave Detail: East 3 feet at 5 seconds. MONDAY East winds near 10 knots, decreasing to 5 to 10 knots. Seas 2 to 3 feet. MONDAY NIGHT East winds 5 to 10 knots. Seas 1 to 2 feet. TUESDAY Northeast to east winds 5 to 10 knots. Seas 1 to 2 feet. TUESDAY NIGHT North to northeast winds 5 to 10 knots, becoming east after midnight. Seas around 1 foot. WEDNESDAY East to southeast winds near 5 knots. Seas 1 foot or less. WEDNESDAY NIGHT North to northeast winds near 5 knots, becoming southeast after midnight. Seas 1 foot or less. THURSDAY East to southeast winds near 5 knots. Seas around 1 foot. THURSDAY NIGHT East to southeast winds near 5 knots. Seas 1 to 2 feet. A slight chance of showers. $$
GMZ052>055-072>075-160845- 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- 433 PM EDT Sat Aug 15 2026 TONIGHT East to southeast winds near 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 5 seconds. SUNDAY East to southeast winds 10 to 15 knots. Seas 2 to 3 feet. Wave Detail: East 3 feet at 5 seconds. SUNDAY NIGHT East winds 10 to 15 knots. Seas 2 to 3 feet. Wave Detail: East 3 feet at 5 seconds. MONDAY East winds near 10 knots, decreasing to 5 to 10 knots. Seas 2 to 3 feet. MONDAY NIGHT East winds 5 to 10 knots. Seas 1 to 2 feet. TUESDAY Northeast to east winds 5 to 10 knots. Seas 1 to 2 feet. TUESDAY NIGHT North to northeast winds 5 to 10 knots, becoming east after midnight. Seas around 1 foot. WEDNESDAY East to southeast winds near 5 knots. Seas 1 foot or less. WEDNESDAY NIGHT North to northeast winds near 5 knots, becoming southeast after midnight. Seas 1 foot or less. THURSDAY East to southeast winds near 5 knots. Seas around 1 foot. THURSDAY NIGHT East to southeast winds near 5 knots. Seas 1 to 2 feet. A slight chance of showers. $$