GMZ005-240230-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1028 AM EDT Fri Oct 23 2026
.SYNOPSIS...
High pressure centered just north of the Great Lakes region will
continue to slide eastward and strengthen over the next several
days. The high will interact with a developing disturbance in the
eastern Caribbean, supporting freshening northeasterly breezes
over the next several days. Breezes will peak Sunday night through
Tuesday, when strong to near gale breezes will be possible. The
freshening breezes and a surge of moisture may also support
elevated rain and isolated strong thunderstorm chances Friday
night through Monday.
The Approximate Shoreward Edge of the Gulf Stream as of October
19, 2026...
46 NM south of Dry Tortugas Light, on Loggerhead Key
18 NM north of Cosgrove Shoal Light, off the Marquesas Keys
12 NM north of Sand Key Light, off Key West
7 NM north-northwest of Looe Key, off Big Pine Key
5 NM southeast of Sombrero Key Light, off Marathon
2 NM south-southeast of Alligator Reef Light, off Islamorada
2 NM northwest of Molasses Reef Light, off Key Largo
3 NM northwest of Carysfort Reef Light, off Ocean Reef
Gulf Stream Information Courtesy of the Naval Oceanographic
Office.
$$
GMZ032-035-240230- 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- 1028 AM EDT Fri Oct 23 2026 SMALL CRAFT SHOULD EXERCISE CAUTION UNTIL WINDS DECREASE THIS AFTERNOON Northeast winds 15 to 20 knots, decreasing to 10 to 15 knots. Seas 2 to 3 feet, subsiding to 1 to 2 feet. West of the Marquesas Keys, seas 3 to 4 feet, occasionally to 5 feet, subsiding to 2 to 3 feet. Nearshore waters choppy, becoming a light to moderate chop. A chance of showers. TONIGHT Northeast winds near 15 knots, increasing to near 20 knots. Seas 1 to 2 feet, building to 2 to 4 feet, occasionally to 5 feet. West of the Marquesas Keys, seas 2 to 3 feet, building to 3 to 5 feet, occasionally to 6 feet. Nearshore waters a moderate chop, becoming rough. A chance of showers with a slight chance of thunderstorms. SATURDAY Northeast winds near 20 knots, decreasing to 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet, except 4 to 5 feet, occasionally to 7 feet west of the Marquesas Keys. Nearshore waters rough, becoming choppy. A slight chance of showers and thunderstorms. SATURDAY NIGHT 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 5 feet, occasionally to 7 feet west of the Marquesas Keys. Nearshore waters rough, becoming choppy. A slight chance of showers and thunderstorms. SUNDAY 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 7 feet west of the Marquesas Keys. Nearshore waters choppy, becoming rough. A chance of showers with a slight chance of thunderstorms. SUNDAY NIGHT North to northeast winds 20 to 25 knots. Seas 3 to 5 feet, occasionally to 6 feet. West of the Marquesas Keys, seas 6 to 7 feet, occasionally to 9 feet, building to 7 to 9 feet, occasionally to 11 feet. Nearshore waters very rough. A chance of showers. MONDAY North to northeast winds 20 to 25 knots, increasing to near 25 knots. Seas 3 to 5 feet, occasionally to 6 feet, except 7 to 9 feet, occasionally to 11 feet west of the Marquesas Keys. Nearshore waters very rough, becoming extremely rough. A chance of showers. MONDAY NIGHT North to northeast winds near 25 knots. Seas 4 to 6 feet, occasionally to 8 feet, except 7 to 9 feet, occasionally to 11 feet west of the Marquesas Keys. Nearshore waters extremely rough. A slight chance of showers. TUESDAY North to northeast winds near 25 knots. Seas 3 to 5 feet, occasionally to 6 feet. West of the Marquesas Keys, seas 7 to 9 feet, occasionally to 11 feet. Nearshore waters extremely rough. A slight chance of showers and thunderstorms. TUESDAY NIGHT North to northeast winds 20 to 25 knots. Seas 3 to 5 feet, occasionally to 6 feet. West of the Marquesas Keys. seas 7 to 9 feet, occasionally to 11 feet, subsiding to 6 to 7 feet, occasionally to 9 feet. Nearshore waters very rough. A slight chance of showers and thunderstorms. $$
GMZ032-035-240230- 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- 1028 AM EDT Fri Oct 23 2026 SMALL CRAFT SHOULD EXERCISE CAUTION UNTIL WINDS DECREASE THIS AFTERNOON Northeast winds 15 to 20 knots, decreasing to 10 to 15 knots. Seas 2 to 3 feet, subsiding to 1 to 2 feet. West of the Marquesas Keys, seas 3 to 4 feet, occasionally to 5 feet, subsiding to 2 to 3 feet. Nearshore waters choppy, becoming a light to moderate chop. A chance of showers. TONIGHT Northeast winds near 15 knots, increasing to near 20 knots. Seas 1 to 2 feet, building to 2 to 4 feet, occasionally to 5 feet. West of the Marquesas Keys, seas 2 to 3 feet, building to 3 to 5 feet, occasionally to 6 feet. Nearshore waters a moderate chop, becoming rough. A chance of showers with a slight chance of thunderstorms. SATURDAY Northeast winds near 20 knots, decreasing to 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet, except 4 to 5 feet, occasionally to 7 feet west of the Marquesas Keys. Nearshore waters rough, becoming choppy. A slight chance of showers and thunderstorms. SATURDAY NIGHT 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 5 feet, occasionally to 7 feet west of the Marquesas Keys. Nearshore waters rough, becoming choppy. A slight chance of showers and thunderstorms. SUNDAY 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 7 feet west of the Marquesas Keys. Nearshore waters choppy, becoming rough. A chance of showers with a slight chance of thunderstorms. SUNDAY NIGHT North to northeast winds 20 to 25 knots. Seas 3 to 5 feet, occasionally to 6 feet. West of the Marquesas Keys, seas 6 to 7 feet, occasionally to 9 feet, building to 7 to 9 feet, occasionally to 11 feet. Nearshore waters very rough. A chance of showers. MONDAY North to northeast winds 20 to 25 knots, increasing to near 25 knots. Seas 3 to 5 feet, occasionally to 6 feet, except 7 to 9 feet, occasionally to 11 feet west of the Marquesas Keys. Nearshore waters very rough, becoming extremely rough. A chance of showers. MONDAY NIGHT North to northeast winds near 25 knots. Seas 4 to 6 feet, occasionally to 8 feet, except 7 to 9 feet, occasionally to 11 feet west of the Marquesas Keys. Nearshore waters extremely rough. A slight chance of showers. TUESDAY North to northeast winds near 25 knots. Seas 3 to 5 feet, occasionally to 6 feet. West of the Marquesas Keys, seas 7 to 9 feet, occasionally to 11 feet. Nearshore waters extremely rough. A slight chance of showers and thunderstorms. TUESDAY NIGHT North to northeast winds 20 to 25 knots. Seas 3 to 5 feet, occasionally to 6 feet. West of the Marquesas Keys. seas 7 to 9 feet, occasionally to 11 feet, subsiding to 6 to 7 feet, occasionally to 9 feet. Nearshore waters very rough. A slight chance of showers and thunderstorms. $$