Hazardous marine condition(s):
Small Craft Advisory
GMZ005-180830-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
421 PM EDT Tue Mar 17 2026
.SYNOPSIS...A cold frontal passage earlier this morning has
supported freshening breezes across the Florida Keys coastal
waters. A prolonged period of fresh to occasionally strong breezes
will continue, as a strong high pressure system filters behind
the front, eventually settling across the Southeast U.S. Breezes
will slacken appreciably beginning Friday, with light to gentle
breezes expected for the weekend.
The Approximate Shoreward Edge of the Gulf Stream as of March 16...
36 NM South of Dry Tortugas Light...on Loggerhead Key.
49 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
31 NM South of Sand Key Light...off Key West.
16 NM South of Looe Key...off Big Pine Key.
14 NM Southeast of Sombrero Key Light...off Marathon.
7 NM Southeast of Alligator Reef Light...off Islamorada.
4 NM Southeast of Molasses Reef Light...off Key Largo.
6 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.
$$
GMZ033-034-180830- Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM out and beyond 5 fathoms- Gulf of America including Dry Tortugas and Rebecca Shoal Channel- 421 PM EDT Tue Mar 17 2026 SMALL CRAFT ADVISORY IN EFFECT TONIGHT North to northeast winds 20 to 25 knots, decreasing to near 20 knots. Seas 5 to 8 feet, occasionally to 10 feet. Wave Detail: Northwest to north 7 feet at 8 seconds. A slight chance of showers. WEDNESDAY North to northeast winds 15 to 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: North 5 feet at 7 seconds. A slight chance of showers. WEDNESDAY NIGHT North to northeast winds increasing to near 20 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: North to northeast 5 feet at 5 seconds and northwest 3 feet at 6 seconds. A chance of showers with a slight chance of thunderstorms. THURSDAY North to northeast winds 20 to 25 knots, decreasing to 15 to 20 knots. Seas 5 to 7 feet, occasionally to 9 feet. A slight chance of showers. THURSDAY NIGHT North to northeast winds 15 to 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. A slight chance of showers. FRIDAY North to northeast winds 15 to 20 knots, decreasing to near 15 knots. Seas 4 to 6 feet, occasionally to 8 feet, subsiding to 3 to 5 feet, occasionally to 6 feet. FRIDAY NIGHT North to northeast winds near 15 knots, decreasing to 10 to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. SATURDAY Northeast winds 10 to 15 knots, decreasing to near 10 knots. Seas 2 to 4 feet, occasionally to 5 feet. SATURDAY NIGHT Northeast winds near 10 knots. Seas 2 to 3 feet. SUNDAY East winds 5 to 10 knots. Seas around 2 feet. SUNDAY NIGHT East winds 5 to 10 knots. Seas 1 to 2 feet. $$
GMZ033-034-180830- 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- 421 PM EDT Tue Mar 17 2026 SMALL CRAFT ADVISORY IN EFFECT TONIGHT North to northeast winds 20 to 25 knots, decreasing to near 20 knots. Seas 5 to 8 feet, occasionally to 10 feet. Wave Detail: Northwest to north 7 feet at 8 seconds. A slight chance of showers. WEDNESDAY North to northeast winds 15 to 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: North 5 feet at 7 seconds. A slight chance of showers. WEDNESDAY NIGHT North to northeast winds increasing to near 20 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: North to northeast 5 feet at 5 seconds and northwest 3 feet at 6 seconds. A chance of showers with a slight chance of thunderstorms. THURSDAY North to northeast winds 20 to 25 knots, decreasing to 15 to 20 knots. Seas 5 to 7 feet, occasionally to 9 feet. A slight chance of showers. THURSDAY NIGHT North to northeast winds 15 to 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. A slight chance of showers. FRIDAY North to northeast winds 15 to 20 knots, decreasing to near 15 knots. Seas 4 to 6 feet, occasionally to 8 feet, subsiding to 3 to 5 feet, occasionally to 6 feet. FRIDAY NIGHT North to northeast winds near 15 knots, decreasing to 10 to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. SATURDAY Northeast winds 10 to 15 knots, decreasing to near 10 knots. Seas 2 to 4 feet, occasionally to 5 feet. SATURDAY NIGHT Northeast winds near 10 knots. Seas 2 to 3 feet. SUNDAY East winds 5 to 10 knots. Seas around 2 feet. SUNDAY NIGHT East winds 5 to 10 knots. Seas 1 to 2 feet. $$