Hazardous marine condition(s):
Short Term Forecast
GMZ005-180845-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
432 PM EDT Sat Oct 17 2026
.SYNOPSIS...
A cold front is progressing southeastward across the central and
eastern Gulf. Once the cold front begins its passage across the
Keys waters, breezes are expected to freshen rapidly amidst
squally conditions. A Small Craft Advisory will likely be required
for part of or all the Florida Keys waters tonight into Sunday.
Fresh, occasionally strong, northeasterly breezes are expected to
persist through the first half of the week. Shower chances will
peak tonight and Sunday.
The Approximate Shoreward Edge of the Gulf Stream as of October 14, 2026...
7 NM south of Dry Tortugas Light, on Loggerhead Key
4 NM north of Cosgrove Shoal Light, off the Marquesas Keys
3 NM north of Sand Key Light, off Key West
0 NM north-northwest of Looe Key, off Big Pine Key
1 NM southeast of Sombrero Key Light, off Marathon
1 NM south-southeast of Alligator Reef Light, off Islamorada
2 NM northwest of Molasses Reef Light, off Key Largo
2 NM northwest of Carysfort Reef Light, off Ocean Reef
Gulf Stream Information Courtesy of the Naval Oceanographic Office.
$$
GMZ033-034-180845- 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- 432 PM EDT Sat Oct 17 2026 SMALL CRAFT SHOULD EXERCISE CAUTION FOR INCREASING WINDS SMALL CRAFT ADVISORY WILL LIKELY BE REQUIRED LATE THIS EVENING TONIGHT Northeast winds 15 to 20 knots, increasing to 20 to 25 knots. Seas 2 to 4 feet, occasionally to 5 feet, building to 5 to 8 feet, occasionally to 10 feet. Wave Detail: North 3 feet at 5 seconds, becoming north 6 feet at 7 seconds. Showers with a slight chance of thunderstorms. SUNDAY Northeast winds 20 to 25 knots, increasing to 25 to 30 knots. Seas 5 to 8 feet, occasionally to 10 feet. Wave Detail: North 6 feet at 7 seconds. A chance of showers with a slight chance of thunderstorms. SUNDAY NIGHT Northeast winds 25 to 30 knots, decreasing to 20 to 25 knots. Seas 5 to 8 feet, occasionally to 10 feet. Wave Detail: Northeast 8 feet at 7 seconds. A chance of showers with a slight chance of thunderstorms. MONDAY Northeast winds 20 to 25 knots. Seas 5 to 8 feet, occasionally to 10 feet, subsiding to 4 to 6 feet, occasionally to 8 feet. A chance of showers with a slight chance of thunderstorms. MONDAY NIGHT Northeast winds 20 to 25 knots. Seas 5 to 7 feet, occasionally to 9 feet. TUESDAY Northeast winds 20 to 25 knots, decreasing to near 20 knots. Seas 5 to 7 feet, occasionally to 9 feet, subsiding to 4 to 6 feet, occasionally to 8 feet. TUESDAY NIGHT Northeast winds near 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. WEDNESDAY Northeast winds near 20 knots, decreasing to near 15 knots. Seas 3 to 5 feet, occasionally to 6 feet, subsiding to 2 to 4 feet, occasionally to 5 feet. WEDNESDAY NIGHT Northeast winds near 15 knots, increasing to 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. A slight chance of showers. THURSDAY Northeast winds 15 to 20 knots, decreasing to 10 to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. A slight chance of showers. THURSDAY NIGHT North to northeast winds 15 to 20 knots. Seas 2 to 3 feet. A slight chance of showers. $$
GMZ033-034-180845- 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- 432 PM EDT Sat Oct 17 2026 SMALL CRAFT SHOULD EXERCISE CAUTION FOR INCREASING WINDS SMALL CRAFT ADVISORY WILL LIKELY BE REQUIRED LATE THIS EVENING TONIGHT Northeast winds 15 to 20 knots, increasing to 20 to 25 knots. Seas 2 to 4 feet, occasionally to 5 feet, building to 5 to 8 feet, occasionally to 10 feet. Wave Detail: North 3 feet at 5 seconds, becoming north 6 feet at 7 seconds. Showers with a slight chance of thunderstorms. SUNDAY Northeast winds 20 to 25 knots, increasing to 25 to 30 knots. Seas 5 to 8 feet, occasionally to 10 feet. Wave Detail: North 6 feet at 7 seconds. A chance of showers with a slight chance of thunderstorms. SUNDAY NIGHT Northeast winds 25 to 30 knots, decreasing to 20 to 25 knots. Seas 5 to 8 feet, occasionally to 10 feet. Wave Detail: Northeast 8 feet at 7 seconds. A chance of showers with a slight chance of thunderstorms. MONDAY Northeast winds 20 to 25 knots. Seas 5 to 8 feet, occasionally to 10 feet, subsiding to 4 to 6 feet, occasionally to 8 feet. A chance of showers with a slight chance of thunderstorms. MONDAY NIGHT Northeast winds 20 to 25 knots. Seas 5 to 7 feet, occasionally to 9 feet. TUESDAY Northeast winds 20 to 25 knots, decreasing to near 20 knots. Seas 5 to 7 feet, occasionally to 9 feet, subsiding to 4 to 6 feet, occasionally to 8 feet. TUESDAY NIGHT Northeast winds near 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. WEDNESDAY Northeast winds near 20 knots, decreasing to near 15 knots. Seas 3 to 5 feet, occasionally to 6 feet, subsiding to 2 to 4 feet, occasionally to 5 feet. WEDNESDAY NIGHT Northeast winds near 15 knots, increasing to 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. A slight chance of showers. THURSDAY Northeast winds 15 to 20 knots, decreasing to 10 to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. A slight chance of showers. THURSDAY NIGHT North to northeast winds 15 to 20 knots. Seas 2 to 3 feet. A slight chance of showers. $$