GMZ005-200845-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
443 PM EDT Sat Sep 19 2026
.SYNOPSIS...
Light to gentle breezes will continue through the weekend, with
variable winds this evening gradually shifting to the southeast
to south, then eventually to the south to southwest through
Sunday. A wet weather pattern will persist across the Florida
Keys coastal waters through early next week, as an upper- level
low retrogrades westward into the Gulf. As a result, scattered to
numerous showers and thunderstorms will be a daily occurence,
with gusty winds, lightning strikes, blinding downpours, and
locally hazardous seas being the main hazards mariners could
encounter in the vicinity of this activity. The upper-level low is
forecast to move out of the area early next week, but lingering
moisture is likely to persist through at least Wednesday.
The Approximate Shoreward Edge of the Gulf Stream as of September
15, 2026...
64 NM south-southeast of Dry Tortugas Light, on Loggerhead Key
40 NM south-southeast of Cosgrove Shoal Light, off the Marquesas Keys
36 NM south-southeast of Sand Key Light, off Key West
35 NM southeast of Looe Key, off Big Pine Key
28 NM southeast of Sombrero Key Light, off Marathon
15 NM east-southeast of Alligator Reef Light, off Islamorada
8 NM east-southeast of Molasses Reef Light, off Key Largo
5 NM east-southeast of Carysfort Reef Light, off Ocean Reef
Gulf Stream Information Courtesy of the Naval Oceanographic Office.
$$
GMZ033-034-200845- Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM out and beyond 5 fathoms- Gulf of America including Dry Tortugas and Rebecca Shoal Channel- 443 PM EDT Sat Sep 19 2026 TONIGHT Variable winds near 5 knots, becoming southeast to south. Seas 1 foot or less. Wave Detail: East 1 foot at 2 seconds. Showers likely with a chance of thunderstorms. Winds and seas higher in the vicinity of any thunderstorm. SUNDAY South winds near 5 knots. Seas 1 foot or less. Wave Detail: South 1 foot at 2 seconds. Showers likely with a chance of thunderstorms. SUNDAY NIGHT Southeast to south winds near 5 knots, increasing to near 10 knots. Seas building to around 1 foot. Wave Detail: South 1 foot at 3 seconds. Showers likely with a chance of thunderstorms. MONDAY South to southwest winds near 5 knots. Seas 1 foot or less. Showers likely with a chance of thunderstorms. MONDAY NIGHT South winds 5 to 10 knots. Seas around 1 foot. Showers likely with a chance of thunderstorms. TUESDAY South winds near 5 knots, becoming southeast to south and increasing to 5 to 10 knots. Seas around 1 foot. Showers likely with a chance of thunderstorms. TUESDAY NIGHT Southeast to south winds 5 to 10 knots. Seas around 1 foot. A chance of thunderstorms. Showers likely. WEDNESDAY Southeast winds near 5 knots. Seas around 1 foot. Showers likely with a chance of thunderstorms. WEDNESDAY NIGHT THROUGH THURSDAY NIGHT East to southeast winds 5 to 10 knots. Seas around 1 foot. A chance of showers with a slight chance of thunderstorms. $$
GMZ033-034-200845- 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- 443 PM EDT Sat Sep 19 2026 TONIGHT Variable winds near 5 knots, becoming southeast to south. Seas 1 foot or less. Wave Detail: East 1 foot at 2 seconds. Showers likely with a chance of thunderstorms. Winds and seas higher in the vicinity of any thunderstorm. SUNDAY South winds near 5 knots. Seas 1 foot or less. Wave Detail: South 1 foot at 2 seconds. Showers likely with a chance of thunderstorms. SUNDAY NIGHT Southeast to south winds near 5 knots, increasing to near 10 knots. Seas building to around 1 foot. Wave Detail: South 1 foot at 3 seconds. Showers likely with a chance of thunderstorms. MONDAY South to southwest winds near 5 knots. Seas 1 foot or less. Showers likely with a chance of thunderstorms. MONDAY NIGHT South winds 5 to 10 knots. Seas around 1 foot. Showers likely with a chance of thunderstorms. TUESDAY South winds near 5 knots, becoming southeast to south and increasing to 5 to 10 knots. Seas around 1 foot. Showers likely with a chance of thunderstorms. TUESDAY NIGHT Southeast to south winds 5 to 10 knots. Seas around 1 foot. A chance of thunderstorms. Showers likely. WEDNESDAY Southeast winds near 5 knots. Seas around 1 foot. Showers likely with a chance of thunderstorms. WEDNESDAY NIGHT THROUGH THURSDAY NIGHT East to southeast winds 5 to 10 knots. Seas around 1 foot. A chance of showers with a slight chance of thunderstorms. $$