GMZ005-122030-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
425 AM EDT Mon Oct 12 2026
.SYNOPSIS...
A couple of nearby features will define the weather across the
Florida Keys for the first half of the week. The Atlantic Ridge is
gradually weakening and moving east towards the central Atlantic.
Another weak high pressure system is located over the Gulf.
Between the two pressure systems lies a weak frontal boundary
that is set up across central Florida. The front is primed to pass
across the Keys waters sometime early in the week, and promote
gentle to moderate northeast to east breezes. Shower chances are
forecast to be slight before mid-week before the previously
mentioned front stalls near the Keys waters. Late in the week,
there is a chance a strong cold front could develop and move
towards the Florida Keys. Frontal passage with this cold front
could occur over next weekend, and we will continue monitoring
this system.
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.
$$
GMZ033-034-122030- Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM out and beyond 5 fathoms- Gulf of America including Dry Tortugas and Rebecca Shoal Channel- 425 AM EDT Mon Oct 12 2026 TODAY Northeast winds 10 to 15 knots, becoming north to northeast. Seas 2 to 3 feet. Wave Detail: Northeast to east 2 feet at 3 seconds and northwest 2 feet at 5 seconds. A slight chance of showers and thunderstorms. TONIGHT North to northeast winds 10 to 15 knots, becoming northeast and increasing to near 15 knots. Seas 2 to 3 feet. Wave Detail: Northwest to north 3 feet at 5 seconds. A slight chance of showers and thunderstorms. TUESDAY Northeast winds near 15 knots, decreasing to 10 to 15 knots. Seas 2 to 3 feet. Wave Detail: North to northeast 3 feet at 5 seconds. A slight chance of showers. TUESDAY NIGHT North to northeast winds 10 to 15 knots, becoming northeast to east and increasing to near 15 knots. Seas 2 to 3 feet. A slight chance of showers. WEDNESDAY Northeast to east winds near 15 knots, decreasing to 10 to 15 knots. Seas 2 to 3 feet. A slight chance of showers. WEDNESDAY NIGHT Northeast to east winds 10 to 15 knots, becoming east and increasing to near 15 knots. Seas 2 to 3 feet. A chance of showers with a slight chance of thunderstorms. THURSDAY East winds 10 to 15 knots. Seas 2 to 3 feet. A chance of showers with a slight chance of thunderstorms. THURSDAY NIGHT East winds 10 to 15 knots. Seas around 2 feet. A chance of thunderstorms with a slight chance of showers. FRIDAY East winds near 10 knots, decreasing to 5 to 10 knots. Seas 1 to 2 feet. A chance of showers and thunderstorms. FRIDAY NIGHT Northeast winds 5 to 10 knots. Seas around 1 foot. Showers likely with a chance of thunderstorms. $$
GMZ033-034-122030- 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- 425 AM EDT Mon Oct 12 2026 TODAY Northeast winds 10 to 15 knots, becoming north to northeast. Seas 2 to 3 feet. Wave Detail: Northeast to east 2 feet at 3 seconds and northwest 2 feet at 5 seconds. A slight chance of showers and thunderstorms. TONIGHT North to northeast winds 10 to 15 knots, becoming northeast and increasing to near 15 knots. Seas 2 to 3 feet. Wave Detail: Northwest to north 3 feet at 5 seconds. A slight chance of showers and thunderstorms. TUESDAY Northeast winds near 15 knots, decreasing to 10 to 15 knots. Seas 2 to 3 feet. Wave Detail: North to northeast 3 feet at 5 seconds. A slight chance of showers. TUESDAY NIGHT North to northeast winds 10 to 15 knots, becoming northeast to east and increasing to near 15 knots. Seas 2 to 3 feet. A slight chance of showers. WEDNESDAY Northeast to east winds near 15 knots, decreasing to 10 to 15 knots. Seas 2 to 3 feet. A slight chance of showers. WEDNESDAY NIGHT Northeast to east winds 10 to 15 knots, becoming east and increasing to near 15 knots. Seas 2 to 3 feet. A chance of showers with a slight chance of thunderstorms. THURSDAY East winds 10 to 15 knots. Seas 2 to 3 feet. A chance of showers with a slight chance of thunderstorms. THURSDAY NIGHT East winds 10 to 15 knots. Seas around 2 feet. A chance of thunderstorms with a slight chance of showers. FRIDAY East winds near 10 knots, decreasing to 5 to 10 knots. Seas 1 to 2 feet. A chance of showers and thunderstorms. FRIDAY NIGHT Northeast winds 5 to 10 knots. Seas around 1 foot. Showers likely with a chance of thunderstorms. $$