GMZ005-132030-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
421 AM EDT Wed May 13 2026
.SYNOPSIS...A stalled frontal boundary over central Florida, a
well defined high pressure system over the north Atlantic, and a
mean layer ridge located north of the Antilles will act together
to cause a surge in winds along the southern Florida coastline.
Westerly breezes are on track to freshen from light to gentle to
moderate to fresh tonight along the northeastern coastal zones.
Showers will continue to pulse on and off across all the Florida
Keys coastal waters. The pressure gradient is expected to collapse
late in the week, thus there is high confidence that there will
be periods of variable winds.
The Approximate Shoreward Edge of the Gulf Stream as of May 12...
35 NM South of Dry Tortugas Light...on Loggerhead Key.
9 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
6 NM South of Sand Key Light...off Key West.
7 NM South of Looe Key...off Big Pine Key.
6 NM Southeast of Sombrero Key Light...off Marathon.
6 NM Southeast of Alligator Reef Light...off Islamorada.
4 NM Southeast of Molasses Reef Light...off Key Largo.
3 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 and RTOFS.
$$
GMZ053>055-073>075-132030- Straits of Florida from Craig Key to west end of Seven Mile Bridge out 20 NM- Straits of Florida from west end of Seven Mile Bridge to south of Halfmoon Shoal out 20 NM- Straits of Florida from Halfmoon Shoal to 20 NM west of Dry Tortugas out 20 NM- Straits of Florida from Craig Key to west end of Seven Mile Bridge 20 to 60 NM out- Straits of Florida from west end of Seven Mile Bridge to south of Halfmoon Shoal 20 to 60 NM out- Straits of Florida from Halfmoon Shoal to 20 NM west of Dry Tortugas 20 to 60 NM out- 421 AM EDT Wed May 13 2026 TODAY Southwest to west winds 5 to 10 knots, increasing to near 10 knots this afternoon. Seas around 1 foot. Wave Detail: West 1 foot at 2 seconds and east to southeast 1 foot at 4 seconds. A slight chance of showers and thunderstorms. TONIGHT West winds near 10 knots. Seas 1 to 2 feet. Wave Detail: West 2 feet at 4 seconds. A chance of showers with a slight chance of thunderstorms. THURSDAY West to northwest winds near 10 knots. Seas 1 to 2 feet. Wave Detail: West to northwest 2 feet at 5 seconds. A chance of showers with a slight chance of thunderstorms. THURSDAY NIGHT Northwest to north winds 5 to 10 knots. Seas 1 to 2 feet. A slight chance of showers and thunderstorms. FRIDAY Variable winds near 5 knots. Seas 1 to 2 feet. A slight chance of showers and thunderstorms. FRIDAY NIGHT Variable winds 5 to 10 knots, becoming east to southeast. Seas around 1 foot. A slight chance of showers and thunderstorms. SATURDAY East winds near 10 knots. Seas 1 to 2 feet. A slight chance of showers and thunderstorms. SATURDAY NIGHT East winds 10 to 15 knots. Seas 2 to 3 feet. A slight chance of showers and thunderstorms. SUNDAY East winds 10 to 15 knots. Seas 2 to 3 feet. A slight chance of showers. SUNDAY NIGHT East winds near 15 knots, increasing to 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. A slight chance of showers. $$
GMZ053>055-073>075-132030- 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 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- 421 AM EDT Wed May 13 2026 TODAY Southwest to west winds 5 to 10 knots, increasing to near 10 knots this afternoon. Seas around 1 foot. Wave Detail: West 1 foot at 2 seconds and east to southeast 1 foot at 4 seconds. A slight chance of showers and thunderstorms. TONIGHT West winds near 10 knots. Seas 1 to 2 feet. Wave Detail: West 2 feet at 4 seconds. A chance of showers with a slight chance of thunderstorms. THURSDAY West to northwest winds near 10 knots. Seas 1 to 2 feet. Wave Detail: West to northwest 2 feet at 5 seconds. A chance of showers with a slight chance of thunderstorms. THURSDAY NIGHT Northwest to north winds 5 to 10 knots. Seas 1 to 2 feet. A slight chance of showers and thunderstorms. FRIDAY Variable winds near 5 knots. Seas 1 to 2 feet. A slight chance of showers and thunderstorms. FRIDAY NIGHT Variable winds 5 to 10 knots, becoming east to southeast. Seas around 1 foot. A slight chance of showers and thunderstorms. SATURDAY East winds near 10 knots. Seas 1 to 2 feet. A slight chance of showers and thunderstorms. SATURDAY NIGHT East winds 10 to 15 knots. Seas 2 to 3 feet. A slight chance of showers and thunderstorms. SUNDAY East winds 10 to 15 knots. Seas 2 to 3 feet. A slight chance of showers. SUNDAY NIGHT East winds near 15 knots, increasing to 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. A slight chance of showers. $$