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.
$$
GMZ032-035-180830- Bayside and Gulfside from Craig Key to west end of Seven Mile Bridge- Gulf of America from west end of Seven Mile Bridge to Halfmoon Shoal out to 5 Fathoms- 421 PM EDT Tue Mar 17 2026 SMALL CRAFT ADVISORY IN EFFECT TONIGHT North to northeast winds near 20 knots. Seas 3 to 5 feet, occasionally to 6 feet, except 5 to 7 feet, occasionally to 9 feet west of the Marquesas Keys. Nearshore waters rough. A chance of showers. WEDNESDAY North to northeast winds 15 to 20 knots, briefly decreasing to 10 to 15 knots in the afternoon. Seas 2 to 4 feet, occasionally to 5 feet. West of the Marquesas Keys, seas 5 to 6 feet, occasionally to 8 feet, subsiding to 4 to 5 feet, occasionally to 6 feet. Nearshore waters choppy, becoming a light to moderate chop. A chance of showers with a slight chance of thunderstorms. WEDNESDAY NIGHT North to northeast winds 15 to 20 knots, increasing to near 20 knots. Seas 2 to 4 feet, occasionally to 5 feet, except 4 to 5 feet, occasionally to 6 feet west of the Marquesas Keys. Nearshore waters choppy, becoming rough. A chance of showers with a slight chance of thunderstorms. THURSDAY North to northeast winds near 20 knots, decreasing to 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet, except 4 to 6 feet, occasionally to 8 feet west of the Marquesas Keys. Nearshore waters rough, becoming choppy. A chance of showers. THURSDAY NIGHT North to northeast winds 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. Nearshore waters choppy. A slight chance of showers. FRIDAY North to northeast winds 15 to 20 knots, decreasing briefly to 10 to 15 knots. Seas 2 to 3 feet, except 3 to 4 feet, occasionally to 5 feet west of the Marquesas Keys. Nearshore waters choppy, becoming a light to moderate chop. A slight chance of showers. FRIDAY NIGHT North to northeast winds near 15 knots, decreasing to 10 to 15 knots. Seas 2 to 3 feet. Nearshore waters a moderate chop, becoming a light to moderate chop. SATURDAY Northeast winds 10 to 15 knots, becoming northeast to east 5 to 10 knots in the afternoon. Seas 2 to 3 feet, subsiding to 1 to 2 feet. Nearshore waters a light to moderate chop, becoming smooth to a light chop. SATURDAY NIGHT Northeast to east winds near 10 knots. Seas 1 to 2 feet. Nearshore waters a light chop. SUNDAY AND SUNDAY NIGHT East winds 5 to 10 knots. Seas 1 to 2 feet. Nearshore waters smooth to a light chop. $$
GMZ032-035-180830- Bayside and Gulfside from Craig Key to west end of Seven Mile Bridge- Gulf of America from west end of Seven Mile Bridge to Halfmoon Shoal out to 5 Fathoms- 421 PM EDT Tue Mar 17 2026 SMALL CRAFT ADVISORY IN EFFECT TONIGHT North to northeast winds near 20 knots. Seas 3 to 5 feet, occasionally to 6 feet, except 5 to 7 feet, occasionally to 9 feet west of the Marquesas Keys. Nearshore waters rough. A chance of showers. WEDNESDAY North to northeast winds 15 to 20 knots, briefly decreasing to 10 to 15 knots in the afternoon. Seas 2 to 4 feet, occasionally to 5 feet. West of the Marquesas Keys, seas 5 to 6 feet, occasionally to 8 feet, subsiding to 4 to 5 feet, occasionally to 6 feet. Nearshore waters choppy, becoming a light to moderate chop. A chance of showers with a slight chance of thunderstorms. WEDNESDAY NIGHT North to northeast winds 15 to 20 knots, increasing to near 20 knots. Seas 2 to 4 feet, occasionally to 5 feet, except 4 to 5 feet, occasionally to 6 feet west of the Marquesas Keys. Nearshore waters choppy, becoming rough. A chance of showers with a slight chance of thunderstorms. THURSDAY North to northeast winds near 20 knots, decreasing to 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet, except 4 to 6 feet, occasionally to 8 feet west of the Marquesas Keys. Nearshore waters rough, becoming choppy. A chance of showers. THURSDAY NIGHT North to northeast winds 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. Nearshore waters choppy. A slight chance of showers. FRIDAY North to northeast winds 15 to 20 knots, decreasing briefly to 10 to 15 knots. Seas 2 to 3 feet, except 3 to 4 feet, occasionally to 5 feet west of the Marquesas Keys. Nearshore waters choppy, becoming a light to moderate chop. A slight chance of showers. FRIDAY NIGHT North to northeast winds near 15 knots, decreasing to 10 to 15 knots. Seas 2 to 3 feet. Nearshore waters a moderate chop, becoming a light to moderate chop. SATURDAY Northeast winds 10 to 15 knots, becoming northeast to east 5 to 10 knots in the afternoon. Seas 2 to 3 feet, subsiding to 1 to 2 feet. Nearshore waters a light to moderate chop, becoming smooth to a light chop. SATURDAY NIGHT Northeast to east winds near 10 knots. Seas 1 to 2 feet. Nearshore waters a light chop. SUNDAY AND SUNDAY NIGHT East winds 5 to 10 knots. Seas 1 to 2 feet. Nearshore waters smooth to a light chop. $$