GMZ005-010830-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
417 PM EDT Wed Sep 30 2026
.SYNOPSIS...
High pressure offshore the Eastern Seaboard will merge with an
existing high pressure across the subtropical Atlantic, and
subsequently build through the remainder of the week. Breezes will
increase, becoming moderate to fresh tonight and continuing
through late week. Widespread exercise caution headlines will be
necesary through at least Friday, with Small Craft Advisories
likely required the Straits of Florida. In addition, a very wet
pattern will remain across the Keys over the next couple days,
resulting in periods of scattered to numerous showers and
thunderstorms.
The Approximate Shoreward Edge of the Gulf Stream as of
September 25, 2026...
43 NM south of Dry Tortugas Light, on Loggerhead Key
20 NM south of Cosgrove Shoal Light, off the Marquesas Keys
14 NM south of Sand Key Light, off Key West
7 NM south-southeast of Looe Key, off Big Pine Key
4 NM south-southeast of Sombrero Key Light, off Marathon
4 NM south-southeast of Alligator Reef Light, off Islamorada
0 NM southeast of Molasses Reef Light, off Key Largo
1 NM west-northwest of Carysfort Reef Light, off Ocean Reef
Gulf Stream Information Courtesy of the Naval Oceanographic Office.
$$
GMZ033-034-010830- Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM out and beyond 5 fathoms- Gulf of America including Dry Tortugas and Rebecca Shoal Channel- 417 PM EDT Wed Sep 30 2026 SMALL CRAFT SHOULD EXERCISE CAUTION TONIGHT East to southeast winds 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: East to southeast 4 feet at 4 seconds. Showers with a chance of thunderstorms. THURSDAY East to southeast winds 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East to southeast 5 feet at 5 seconds. Showers with a chance of thunderstorms. THURSDAY NIGHT East to southeast winds 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East to southeast 5 feet at 5 seconds. Showers likely with a chance of thunderstorms. FRIDAY East to southeast winds 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Showers likely with a chance of thunderstorms. FRIDAY NIGHT AND SATURDAY East to southeast winds 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. A chance of showers and thunderstorms. SATURDAY NIGHT East to southeast winds near 15 knots. Seas 2 to 3 feet. A chance of showers and thunderstorms. SUNDAY East to southeast winds 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. A chance of showers and thunderstorms. SUNDAY NIGHT East to southeast winds near 10 knots. Seas 2 to 3 feet. A chance of showers and thunderstorms. MONDAY AND MONDAY NIGHT Southeast winds 5 to 10 knots. Seas 1 to 2 feet. A chance of showers and thunderstorms. $$
GMZ033-034-010830- 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- 417 PM EDT Wed Sep 30 2026 SMALL CRAFT SHOULD EXERCISE CAUTION TONIGHT East to southeast winds 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: East to southeast 4 feet at 4 seconds. Showers with a chance of thunderstorms. THURSDAY East to southeast winds 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East to southeast 5 feet at 5 seconds. Showers with a chance of thunderstorms. THURSDAY NIGHT East to southeast winds 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East to southeast 5 feet at 5 seconds. Showers likely with a chance of thunderstorms. FRIDAY East to southeast winds 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Showers likely with a chance of thunderstorms. FRIDAY NIGHT AND SATURDAY East to southeast winds 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. A chance of showers and thunderstorms. SATURDAY NIGHT East to southeast winds near 15 knots. Seas 2 to 3 feet. A chance of showers and thunderstorms. SUNDAY East to southeast winds 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. A chance of showers and thunderstorms. SUNDAY NIGHT East to southeast winds near 10 knots. Seas 2 to 3 feet. A chance of showers and thunderstorms. MONDAY AND MONDAY NIGHT Southeast winds 5 to 10 knots. Seas 1 to 2 feet. A chance of showers and thunderstorms. $$