GMZ005-152030-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
427 AM EDT Sat Aug 15 2026
.SYNOPSIS...Gentle to moderate east to southeast breezes across
the Florida Keys will start to slacken before the start of the
work week. The subtropical ridge is expected to weaken as a mid
latitude trough descends into the Atlantic from the eastern United
States. Periods of light and variable breezes are possible early
next week as a result. Meanwhile, a Saharan Air Layer is forecast
to move across the Keys waters early next week. There is high
confidence shower coverage will be low for most of the forecast
period.
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.
$$
GMZ033-034-152030- Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM out and beyond 5 fathoms- Gulf of America including Dry Tortugas and Rebecca Shoal Channel- 427 AM EDT Sat Aug 15 2026 TODAY East to southeast winds 10 to 15 knots, decreasing to near 10 knots. Seas 2 to 3 feet, subsiding to 1 to 3 feet. Wave Detail: East to southeast 2 feet at 4 seconds. A chance of showers with a slight chance of thunderstorms. TONIGHT East to southeast winds 10 to 15 knots. Seas building to 2 to 3 feet. Wave Detail: East to southeast 2 feet at 4 seconds. A slight chance of showers and thunderstorms. SUNDAY East winds near 10 knots, decreasing to 5 to 10 knots. Seas 1 to 3 feet. Wave Detail: East to southeast 2 feet at 4 seconds. SUNDAY NIGHT East winds 5 to 10 knots. Seas 1 to 2 feet. MONDAY Northeast to east winds 5 to 10 knots, becoming north to northeast. Seas around 1 foot. MONDAY NIGHT North to northeast winds near 5 knots. Seas 1 foot or less. TUESDAY Northwest to north winds near 5 knots. Seas around 1 foot. TUESDAY NIGHT Northwest winds near 5 knots. Seas around 1 foot. WEDNESDAY Northwest winds near 5 knots. Seas around 1 foot. WEDNESDAY NIGHT Northwest to north winds near 5 knots. Seas around 1 foot. A slight chance of showers. $$
GMZ033-034-152030- 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- 427 AM EDT Sat Aug 15 2026 TODAY East to southeast winds 10 to 15 knots, decreasing to near 10 knots. Seas 2 to 3 feet, subsiding to 1 to 3 feet. Wave Detail: East to southeast 2 feet at 4 seconds. A chance of showers with a slight chance of thunderstorms. TONIGHT East to southeast winds 10 to 15 knots. Seas building to 2 to 3 feet. Wave Detail: East to southeast 2 feet at 4 seconds. A slight chance of showers and thunderstorms. SUNDAY East winds near 10 knots, decreasing to 5 to 10 knots. Seas 1 to 3 feet. Wave Detail: East to southeast 2 feet at 4 seconds. SUNDAY NIGHT East winds 5 to 10 knots. Seas 1 to 2 feet. MONDAY Northeast to east winds 5 to 10 knots, becoming north to northeast. Seas around 1 foot. MONDAY NIGHT North to northeast winds near 5 knots. Seas 1 foot or less. TUESDAY Northwest to north winds near 5 knots. Seas around 1 foot. TUESDAY NIGHT Northwest winds near 5 knots. Seas around 1 foot. WEDNESDAY Northwest winds near 5 knots. Seas around 1 foot. WEDNESDAY NIGHT Northwest to north winds near 5 knots. Seas around 1 foot. A slight chance of showers. $$