GMZ005-212030-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
420 AM EDT Fri Aug 21 2026
.SYNOPSIS...
A split ridge pattern remains in place across the Florida Keys
coastal waters. This will promote generally light to gentle SE
breezes today, becoming variable at times during the afternoon, with
a chance for thunderstorms in the southeastern Gulf. SE breezes
will become more established over the weekend, freshening and
becoming gentle to moderate at times during the overnight hours as
Atlantic ridging builds slightly westward across the Bahamas.
Rain chances will also slightly increase across the coastal waters
this weekend in response to rising moisture content and subsiding
SAL dust concentrations.
The Approximate Shoreward Edge of the Gulf Stream as of August
19, 2026...
37 NM south of Dry Tortugas Light, on Loggerhead Key
20 NM south-southeast of Cosgrove Shoal Light, off the Marquesas Keys
14 NM south-southeast of Sand Key Light, off Key West
10 NM south-southeast of Looe Key, off Big Pine Key
10 NM south-southeast of Sombrero Key Light, off Marathon
3 NM southeast of Alligator Reef Light, off Islamorada
1 NM west-northwest of Molasses Reef Light, off Key Largo
1 NM east-southeast of Carysfort Reef Light, off Ocean Reef
Gulf Stream Information Courtesy of the Naval Oceanographic
Office.
$$
GMZ033-034-212030- Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM out and beyond 5 fathoms- Gulf of America including Dry Tortugas and Rebecca Shoal Channel- 420 AM EDT Fri Aug 21 2026 TODAY Southwest winds near 5 knots, becoming variable. Seas 1 foot or less. Wave Detail: Northwest 1 foot at 5 seconds. A chance of showers and thunderstorms. TONIGHT Variable near 5 knots, becoming southeast 5 to 10 knots. Seas 1 foot or less, building to around 1 foot. Wave Detail: Northwest 1 foot at 4 seconds. A slight chance of showers and thunderstorms. SATURDAY Southeast to south winds near 5 knots, becoming variable. Seas 1 foot or less. Wave Detail: Northwest 1 foot at 4 seconds. A slight chance of showers and thunderstorms. SATURDAY NIGHT Variable near 5 knots, becoming southeast. Seas 1 foot or less. SUNDAY Variable near 5 knots. Seas 1 foot or less. A slight chance of showers and thunderstorms. SUNDAY NIGHT East to southeast winds near 5 knots. Seas 1 foot or less. A slight chance of showers and thunderstorms. MONDAY East winds 5 to 10 knots. Seas around 1 foot. A slight chance of showers and thunderstorms. MONDAY NIGHT East to southeast winds 5 to 10 knots. Seas around 1 foot. A chance of showers and thunderstorms. TUESDAY East to southeast winds 5 to 10 knots. Seas around 1 foot. A chance of showers and thunderstorms. TUESDAY NIGHT East winds near 10 knots. Seas 1 to 2 feet. Showers and thunderstorms likely. $$
GMZ033-034-212030- 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- 420 AM EDT Fri Aug 21 2026 TODAY Southwest winds near 5 knots, becoming variable. Seas 1 foot or less. Wave Detail: Northwest 1 foot at 5 seconds. A chance of showers and thunderstorms. TONIGHT Variable near 5 knots, becoming southeast 5 to 10 knots. Seas 1 foot or less, building to around 1 foot. Wave Detail: Northwest 1 foot at 4 seconds. A slight chance of showers and thunderstorms. SATURDAY Southeast to south winds near 5 knots, becoming variable. Seas 1 foot or less. Wave Detail: Northwest 1 foot at 4 seconds. A slight chance of showers and thunderstorms. SATURDAY NIGHT Variable near 5 knots, becoming southeast. Seas 1 foot or less. SUNDAY Variable near 5 knots. Seas 1 foot or less. A slight chance of showers and thunderstorms. SUNDAY NIGHT East to southeast winds near 5 knots. Seas 1 foot or less. A slight chance of showers and thunderstorms. MONDAY East winds 5 to 10 knots. Seas around 1 foot. A slight chance of showers and thunderstorms. MONDAY NIGHT East to southeast winds 5 to 10 knots. Seas around 1 foot. A chance of showers and thunderstorms. TUESDAY East to southeast winds 5 to 10 knots. Seas around 1 foot. A chance of showers and thunderstorms. TUESDAY NIGHT East winds near 10 knots. Seas 1 to 2 feet. Showers and thunderstorms likely. $$