Hazardous marine condition(s):
Short Term Forecast
GMZ005-310830-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
416 PM EDT Sat Aug 30 2025
.SYNOPSIS...An early season Canadian high pressure system will
continue to traverse the eastern United States and move into the
Atlantic over the next few days. This will allow for breezes to
remain light through the weekend. Pressure gradient across the
Gulf including Florida and the Florida Keys will increase early
next week, resulting in freshening breezes. Moisture will increase
as well, supporting higher shower and thunderstorm coverage
through early next week.
The Approximate Shoreward Edge of the Gulf Stream as of August 21...
20 NM South of Dry Tortugas Light...on Loggerhead Key.
9 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
9 NM South of Sand Key Light...off Key West.
13 NM South of Looe Key...off Big Pine Key.
17 NM Southeast of Sombrero Key Light...off Marathon.
17 NM Southeast of Alligator Reef Light...off Islamorada.
13 NM Southeast of Molasses Reef Light...off Key Largo.
5 NM Southeast of Carysfort Reef Light...off Ocean Reef.
Gulf Stream Information Courtesy of the National Weather Service in
Key West based on products from NASA SPoRT.
$$
GMZ052>055-072>075-310830- 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- 416 PM EDT Sat Aug 30 2025 .TONIGHT West to northwest winds 5 to 10 knots, becoming southwest after midnight. Seas around 1 foot. Wave Detail: East 1 foot at 3 seconds. Scattered showers and thunderstorms. SUNDAY Southwest to west winds 5 to 10 knots, becoming west to northwest near 10 knots. Seas around 1 foot. Wave Detail: Southwest 1 foot at 2 seconds. Scattered showers and thunderstorms. SUNDAY NIGHT Northwest winds near 10 knots, decreasing to 5 to 10 knots. Seas around 1 foot. Scattered showers and thunderstorms. MONDAY West to northwest winds 5 to 10 knots, increasing to near 10 knots. Seas around 1 foot. Scattered showers and thunderstorms. MONDAY NIGHT West to northwest winds near 10 knots. Seas 1 to 2 feet. Scattered showers and thunderstorms. TUESDAY West to northwest winds near 10 knots, becoming southwest to west 10 to 15 knots. Seas 1 to 2 feet, building to around 2 feet. Scattered showers and thunderstorms. TUESDAY NIGHT Southwest to west winds 10 to 15 knots. Seas 2 to 3 feet. Scattered showers and thunderstorms. WEDNESDAY Southwest to west winds increasing to near 15 knots. Seas 3 to 4 feet. Scattered showers and thunderstorms. WEDNESDAY NIGHT Southwest to west winds near 15 knots. Seas 3 to 4 feet. Scattered showers and thunderstorms. THURSDAY Southwest to west winds 15 to 20 knots, becoming west near 15 knots. Seas 2 to 3 feet. Scattered showers and thunderstorms. THURSDAY NIGHT Southwest to west winds decreasing to 10 to 15 knots. Seas 1 to 2 feet. Scattered showers and thunderstorms. $$
GMZ052>055-072>075-310830- 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- 416 PM EDT Sat Aug 30 2025 .TONIGHT West to northwest winds 5 to 10 knots, becoming southwest after midnight. Seas around 1 foot. Wave Detail: East 1 foot at 3 seconds. Scattered showers and thunderstorms. SUNDAY Southwest to west winds 5 to 10 knots, becoming west to northwest near 10 knots. Seas around 1 foot. Wave Detail: Southwest 1 foot at 2 seconds. Scattered showers and thunderstorms. SUNDAY NIGHT Northwest winds near 10 knots, decreasing to 5 to 10 knots. Seas around 1 foot. Scattered showers and thunderstorms. MONDAY West to northwest winds 5 to 10 knots, increasing to near 10 knots. Seas around 1 foot. Scattered showers and thunderstorms. MONDAY NIGHT West to northwest winds near 10 knots. Seas 1 to 2 feet. Scattered showers and thunderstorms. TUESDAY West to northwest winds near 10 knots, becoming southwest to west 10 to 15 knots. Seas 1 to 2 feet, building to around 2 feet. Scattered showers and thunderstorms. TUESDAY NIGHT Southwest to west winds 10 to 15 knots. Seas 2 to 3 feet. Scattered showers and thunderstorms. WEDNESDAY Southwest to west winds increasing to near 15 knots. Seas 3 to 4 feet. Scattered showers and thunderstorms. WEDNESDAY NIGHT Southwest to west winds near 15 knots. Seas 3 to 4 feet. Scattered showers and thunderstorms. THURSDAY Southwest to west winds 15 to 20 knots, becoming west near 15 knots. Seas 2 to 3 feet. Scattered showers and thunderstorms. THURSDAY NIGHT Southwest to west winds decreasing to 10 to 15 knots. Seas 1 to 2 feet. Scattered showers and thunderstorms. $$