GMZ005-102030-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
429 AM EDT Sat Oct 10 2026
.SYNOPSIS...
Post-Tropical Cyclone Isaias made landfall last evening near
Destin, FL. The storm continues to move rapidly northward while
weakening. Moderate to fresh southeast to south breezes are
expected to continue throughout the Florida Keys coastal waters,
especially the SE Gulf, western Strait, and the nearshore waters
surrounding the Lower Keys today. Elevated swells will persist
through the western FL Straits today and the SE Gulf waters today.
Breezes will only modestly slacken to gentle to moderate as the
cyclone continues to move away and ridging builds in behind it.
Meanwhile, a plume of moisture will move through the Keys today
through tonight with an increase in shower and thunderstorm
coverage, especially tonight. Thereafter, a frontal boundary may
push through the region early next week promoting northeast
breezes.
The Approximate Shoreward Edge of the Gulf Stream as of October 9,
2026...
53 NM south-southeast of Dry Tortugas Light, on Loggerhead Key
33 NM south-southeast of Cosgrove Shoal Light, off the Marquesas Keys
24 NM south-southeast of Sand Key Light, off Key West
19 NM south-southeast of Looe Key, off Big Pine Key
13 NM south-southeast of Sombrero Key Light, off Marathon
5 NM south-southeast of Alligator Reef Light, off Islamorada
2 NM east of Molasses Reef Light, off Key Largo
2 NM east of Carysfort Reef Light, off Ocean Reef
Gulf Stream Information Courtesy of the Naval Oceanographic
Office.
$$
GMZ033-034-102030- Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM out and beyond 5 fathoms- Gulf of America including Dry Tortugas and Rebecca Shoal Channel- 429 AM EDT Sat Oct 10 2026 SMALL CRAFT SHOULD EXERCISE CAUTION UNTIL WINDS DECREASE AND SEAS SUBSIDE TODAY Southeast to south winds 15 to 20 knots, decreasing to 10 to 15 knots late. Seas 4 to 6 feet, occasionally to 8 feet, subsiding to 3 to 4 feet, occasionally to 5 feet. Wave Detail: West 4 feet at 9 seconds and southeast to south 3 feet at 5 seconds. A slight chance of thunderstorms. A slight chance of showers this morning, then a chance of showers this afternoon. TONIGHT Southeast to south winds 10 to 15 knots, becoming southeast. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: West to northwest 4 feet at 8 seconds and southeast 2 feet at 4 seconds. Showers likely with a slight chance of thunderstorms. SUNDAY East to southeast winds near 10 knots, becoming east and decreasing to 5 to 10 knots. Seas 2 to 3 feet, subsiding to around 2 feet. Wave Detail: Southeast 2 feet at 4 seconds and west to northwest 2 feet at 7 seconds. A chance of showers with a slight chance of thunderstorms. SUNDAY NIGHT Northeast to east winds 5 to 10 knots, increasing to 10 to 15 knots. Seas around 2 feet, building to 2 to 3 feet. A slight chance of showers and thunderstorms. MONDAY Northeast winds 10 to 15 knots. Seas 2 to 3 feet. A slight chance of showers and thunderstorms. MONDAY NIGHT Northeast winds 10 to 15 knots, increasing to near 15 knots. Seas 2 to 3 feet. A slight chance of showers and thunderstorms. TUESDAY Northeast winds near 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. TUESDAY NIGHT Northeast winds 10 to 15 knots. Seas 2 to 3 feet. WEDNESDAY Northeast winds 10 to 15 knots, decreasing to 5 to 10 knots in the afternoon. Seas 1 to 2 feet. WEDNESDAY NIGHT Northeast to east winds increasing to 10 to 15 knots. Seas 1 to 2 feet. A slight chance of showers. $$
GMZ033-034-102030- 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- 429 AM EDT Sat Oct 10 2026 SMALL CRAFT SHOULD EXERCISE CAUTION UNTIL WINDS DECREASE AND SEAS SUBSIDE TODAY Southeast to south winds 15 to 20 knots, decreasing to 10 to 15 knots late. Seas 4 to 6 feet, occasionally to 8 feet, subsiding to 3 to 4 feet, occasionally to 5 feet. Wave Detail: West 4 feet at 9 seconds and southeast to south 3 feet at 5 seconds. A slight chance of thunderstorms. A slight chance of showers this morning, then a chance of showers this afternoon. TONIGHT Southeast to south winds 10 to 15 knots, becoming southeast. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: West to northwest 4 feet at 8 seconds and southeast 2 feet at 4 seconds. Showers likely with a slight chance of thunderstorms. SUNDAY East to southeast winds near 10 knots, becoming east and decreasing to 5 to 10 knots. Seas 2 to 3 feet, subsiding to around 2 feet. Wave Detail: Southeast 2 feet at 4 seconds and west to northwest 2 feet at 7 seconds. A chance of showers with a slight chance of thunderstorms. SUNDAY NIGHT Northeast to east winds 5 to 10 knots, increasing to 10 to 15 knots. Seas around 2 feet, building to 2 to 3 feet. A slight chance of showers and thunderstorms. MONDAY Northeast winds 10 to 15 knots. Seas 2 to 3 feet. A slight chance of showers and thunderstorms. MONDAY NIGHT Northeast winds 10 to 15 knots, increasing to near 15 knots. Seas 2 to 3 feet. A slight chance of showers and thunderstorms. TUESDAY Northeast winds near 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. TUESDAY NIGHT Northeast winds 10 to 15 knots. Seas 2 to 3 feet. WEDNESDAY Northeast winds 10 to 15 knots, decreasing to 5 to 10 knots in the afternoon. Seas 1 to 2 feet. WEDNESDAY NIGHT Northeast to east winds increasing to 10 to 15 knots. Seas 1 to 2 feet. A slight chance of showers. $$