GMZ005-192115-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
510 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 wind speeds mainly less than 10 knots. However, brief surges
in wind speeds are possible in the evening hours with breezes
occasionally approaching 15 to 20 knots near the Upper Keys.
Exercise cautionary conditions may be periodically required for
waters adjacent to 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.
$$
GMZ033-034-192115- Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM out and beyond 5 fathoms- Gulf of America including Dry Tortugas and Rebecca Shoal Channel- 510 AM EDT Wed Aug 19 2026 TODAY Northwest to north winds 5 to 10 knots. Seas around 1 foot. Wave Detail: Northwest to north 1 foot at 4 seconds. TONIGHT Northwest winds near 10 knots, becoming northwest to north. Seas 1 to 2 feet. Wave Detail: Northwest 2 feet at 5 seconds. A slight chance of showers and thunderstorms. THURSDAY Northwest winds near 5 knots. Seas around 1 foot. Wave Detail: Northwest 1 foot at 5 seconds. THURSDAY NIGHT Northwest to north winds near 5 knots, becoming southeast to south. Seas around 1 foot. A slight chance of showers and thunderstorms. FRIDAY Southwest winds near 5 knots. Seas 1 foot or less. FRIDAY NIGHT West to northwest winds near 5 knots, becoming southeast. Seas 1 foot or less. A slight chance of showers and thunderstorms. SATURDAY South winds near 5 knots, becoming west in the afternoon. Seas 1 foot or less. SATURDAY NIGHT Northeast winds near 5 knots, becoming southeast to south. Seas 1 foot or less. A slight chance of showers and thunderstorms. SUNDAY Southeast to south winds near 5 knots, becoming north to northeast. Seas 1 foot or less. A slight chance of showers and thunderstorms. SUNDAY NIGHT East winds near 5 knots. Seas 1 foot or less. A slight chance of showers and thunderstorms. $$
GMZ033-034-192115- 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- 510 AM EDT Wed Aug 19 2026 TODAY Northwest to north winds 5 to 10 knots. Seas around 1 foot. 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. $$