Hazardous marine condition(s):
Short Term Forecast
GMZ005-220230-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1022 AM EDT Sun Sep 21 2025
.SYNOPSIS...High pressure over the Eastern Seaboard will lead to
gentle northeast to east breezes this afternoon. As we head into
the new work week, this high will shift farther out into the North
Atlantic and slowly weaken. As a result, northeast to east
breezes shift to east to southeast tonight while slackening to
light to gentle breezes. Mainly light breezes, occasionally light
to gentle will prevail for much of the week as weak high pressure
remains across the Florida Peninsula.
The Approximate Shoreward Edge of the Gulf Stream as of September
16...
53 NM South of Dry Tortugas Light...on Loggerhead Key.
40 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
32 NM South of Sand Key Light...off Key West.
15 NM South of Looe Key...off Big Pine Key.
17 NM Southeast of Sombrero Key Light...off Marathon.
14 NM Southeast of Alligator Reef Light...off Islamorada.
13 NM Southeast of Molasses Reef Light...off Key Largo.
9 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>075-220230- 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- 1022 AM EDT Sun Sep 21 2025 THIS AFTERNOON Northeast to east winds 10 to 15 knots, decreasing to near 10 knots. Seas subsiding to around 2 feet. Wave Detail: Northeast 2 feet at 4 seconds. Scattered showers and isolated thunderstorms. TONIGHT Northeast to east winds near 10 knots, becoming east to southeast. Seas around 2 feet. Wave Detail: Northeast to east 2 feet at 5 seconds. Numerous showers and isolated thunderstorms. MONDAY East to southeast winds 5 to 10 knots. Seas 1 to 2 feet. Wave Detail: East 2 feet at 4 seconds. Numerous showers and isolated thunderstorms. MONDAY NIGHT East to southeast winds near 10 knots, increasing to 10 to 15 knots. Seas 1 to 2 feet, building to around 2 feet. Scattered showers and isolated thunderstorms. TUESDAY Southeast winds decreasing to 5 to 10 knots. Seas subsiding to 1 to 2 feet. Scattered showers and isolated thunderstorms. TUESDAY NIGHT East winds 5 to 10 knots. Seas 1 to 2 feet. Scattered showers and isolated thunderstorms. WEDNESDAY Northeast to east winds near 5 knots. Seas around 1 foot. Scattered showers and isolated thunderstorms. WEDNESDAY NIGHT Northeast winds 5 to 10 knots. Seas 1 to 2 feet. Scattered showers and isolated thunderstorms. THURSDAY Northeast winds 5 to 10 knots. Seas 1 to 2 feet. Scattered showers and isolated thunderstorms. THURSDAY NIGHT Northeast winds near 5 knots. Seas around 1 foot. Scattered showers and isolated thunderstorms. $$
GMZ052>055-072>075-220230- 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- 1022 AM EDT Sun Sep 21 2025 THIS AFTERNOON Northeast to east winds 10 to 15 knots, decreasing to near 10 knots. Seas subsiding to around 2 feet. Wave Detail: Northeast 2 feet at 4 seconds. Scattered showers and isolated thunderstorms. TONIGHT Northeast to east winds near 10 knots, becoming east to southeast. Seas around 2 feet. Wave Detail: Northeast to east 2 feet at 5 seconds. Numerous showers and isolated thunderstorms. MONDAY East to southeast winds 5 to 10 knots. Seas 1 to 2 feet. Wave Detail: East 2 feet at 4 seconds. Numerous showers and isolated thunderstorms. MONDAY NIGHT East to southeast winds near 10 knots, increasing to 10 to 15 knots. Seas 1 to 2 feet, building to around 2 feet. Scattered showers and isolated thunderstorms. TUESDAY Southeast winds decreasing to 5 to 10 knots. Seas subsiding to 1 to 2 feet. Scattered showers and isolated thunderstorms. TUESDAY NIGHT East winds 5 to 10 knots. Seas 1 to 2 feet. Scattered showers and isolated thunderstorms. WEDNESDAY Northeast to east winds near 5 knots. Seas around 1 foot. Scattered showers and isolated thunderstorms. WEDNESDAY NIGHT Northeast winds 5 to 10 knots. Seas 1 to 2 feet. Scattered showers and isolated thunderstorms. THURSDAY Northeast winds 5 to 10 knots. Seas 1 to 2 feet. Scattered showers and isolated thunderstorms. THURSDAY NIGHT Northeast winds near 5 knots. Seas around 1 foot. Scattered showers and isolated thunderstorms. $$