GMZ005-200245-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1038 AM EDT Wed Aug 19 2026
.SYNOPSIS...
A ridge axis draped across the Florida Keys will maintain a
mostly variable wind pattern through the remainder of the week,
with generally light to gentle breezes. However, daytime heating
over South Florida will support brief surges in wind speeds in
the late afternoon and evening hours off the Upper Keys. A broad
swath of Saharan air blanketing the area will maintain rain- free
conditions today, but rain chances will slowly increase into late
week as moisture slowly recovers. By the weekend, a light and
variable flow pattern should persist on Saturday before winds
gradually increase and become more southeasterly by late weekend
and into next week.
The Approximate Shoreward Edge of the Gulf Stream as of August
13, 2026...
38 NM South of Dry Tortugas Light...on Loggerhead Key.
20 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
17 NM South of Sand Key Light...off Key West.
21 NM South of Looe Key...off Big Pine Key.
18 NM Southeast of Sombrero Key Light...off Marathon.
7 NM Southeast of Alligator Reef Light...off Islamorada.
7 NM Southeast of Molasses Reef Light...off Key Largo.
2 NM Southeast of Carysfort Reef Light...off Ocean Reef.
Gulf Stream Information Courtesy of the National Weather Service in
Key West, using data from RTOFS and NASA SPoRT SST.
$$
GMZ033-034-200245- Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM out and beyond 5 fathoms- Gulf of America including Dry Tortugas and Rebecca Shoal Channel- 1038 AM EDT Wed Aug 19 2026 THIS AFTERNOON Northwest to north winds 5 to 10 knots, increasing to near 10 knots. Seas around 1 foot, building to 1 to 2 feet. Wave Detail: Northwest to north 1 foot at 4 seconds. TONIGHT Northwest winds near 10 knots, becoming northwest to north. Seas 1 to 2 feet. Wave Detail: Northwest 2 feet at 5 seconds. A slight chance of showers and thunderstorms. THURSDAY Northwest winds near 5 knots. Seas around 1 foot. Wave Detail: Northwest 1 foot at 5 seconds. THURSDAY NIGHT Northwest to north winds near 5 knots, becoming southeast to south. Seas around 1 foot. A slight chance of showers and thunderstorms. FRIDAY Southwest winds near 5 knots. Seas 1 foot or less. FRIDAY NIGHT West to northwest winds near 5 knots, becoming southeast. Seas 1 foot or less. A slight chance of showers and thunderstorms. SATURDAY South winds near 5 knots, becoming west in the afternoon. Seas 1 foot or less. SATURDAY NIGHT Northeast winds near 5 knots, becoming southeast to south. Seas 1 foot or less. A slight chance of showers and thunderstorms. SUNDAY Southeast to south winds near 5 knots, becoming north to northeast. Seas 1 foot or less. A slight chance of showers and thunderstorms. SUNDAY NIGHT East winds near 5 knots. Seas 1 foot or less. A slight chance of showers and thunderstorms. $$
GMZ033-034-200245- 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- 1038 AM EDT Wed Aug 19 2026 THIS AFTERNOON Northwest to north winds 5 to 10 knots, increasing to near 10 knots. Seas around 1 foot, building to 1 to 2 feet. Wave Detail: Northwest to north 1 foot at 4 seconds. TONIGHT Northwest winds near 10 knots, becoming northwest to north. Seas 1 to 2 feet. Wave Detail: Northwest 2 feet at 5 seconds. A slight chance of showers and thunderstorms. THURSDAY Northwest winds near 5 knots. Seas around 1 foot. Wave Detail: Northwest 1 foot at 5 seconds. THURSDAY NIGHT Northwest to north winds near 5 knots, becoming southeast to south. Seas around 1 foot. A slight chance of showers and thunderstorms. FRIDAY Southwest winds near 5 knots. Seas 1 foot or less. FRIDAY NIGHT West to northwest winds near 5 knots, becoming southeast. Seas 1 foot or less. A slight chance of showers and thunderstorms. SATURDAY South winds near 5 knots, becoming west in the afternoon. Seas 1 foot or less. SATURDAY NIGHT Northeast winds near 5 knots, becoming southeast to south. Seas 1 foot or less. A slight chance of showers and thunderstorms. SUNDAY Southeast to south winds near 5 knots, becoming north to northeast. Seas 1 foot or less. A slight chance of showers and thunderstorms. SUNDAY NIGHT East winds near 5 knots. Seas 1 foot or less. A slight chance of showers and thunderstorms. $$