GMZ005-290830-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
422 PM EDT Mon Sep 28 2026
.SYNOPSIS...
An old frontal boundary will lift northward across the Keys this
evening, allowing winds to back to the south and southwest this
evening and eventually to the southeast to south tonight. Winds
then become more easterly by Tuesday as a high pressure moves into
the eastern U.S. Thereafter, this high will merge with an
existing high pressure across the Atlantic and subsequently will
build. This will promote freshening breezes, with an increasing
likelihood of moderate to fresh breezes for the latter half of the
week.
The Approximate Shoreward Edge of the Gulf Stream as of
September 25, 2026...
43 NM south of Dry Tortugas Light, on Loggerhead Key
20 NM south of Cosgrove Shoal Light, off the Marquesas Keys
14 NM south of Sand Key Light, off Key West
7 NM south-southeast of Looe Key, off Big Pine Key
4 NM south-southeast of Sombrero Key Light, off Marathon
4 NM south-southeast of Alligator Reef Light, off Islamorada
0 NM southeast of Molasses Reef Light, off Key Largo
1 NM west-northwest of Carysfort Reef Light, off Ocean Reef
Gulf Stream Information Courtesy of the Naval Oceanographic Office.
$$
GMZ033-034-290830- Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM out and beyond 5 fathoms- Gulf of America including Dry Tortugas and Rebecca Shoal Channel- 422 PM EDT Mon Sep 28 2026 TONIGHT South to southwest winds 5 to 10 knots, becoming southeast to south. Seas around 1 foot. Wave Detail: Southwest 1 foot at 2 seconds. A chance of showers and thunderstorms. TUESDAY Southeast winds 5 to 10 knots, becoming southeast to south 10 to 15 knots. Seas 1 to 2 feet. Wave Detail: South 1 foot at 2 seconds. Showers likely with a chance of thunderstorms. TUESDAY NIGHT East to southeast winds 10 to 15 knots. Seas 1 to 2 feet. Wave Detail: Southeast 2 feet at 3 seconds and southwest 1 foot at 5 seconds. Showers likely with a chance of thunderstorms. WEDNESDAY East winds 10 to 15 knots, increasing to 15 to 20 knots. Seas 2 to 3 feet. Showers likely with a chance of thunderstorms. WEDNESDAY NIGHT East winds 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Showers likely with a chance of thunderstorms. THURSDAY East to southeast winds near 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Showers likely with a chance of thunderstorms. THURSDAY NIGHT East to southeast winds 15 to 20 knots. Seas 4 to 5 feet, occasionally to 6 feet. Showers likely with a chance of thunderstorms. FRIDAY East to southeast winds 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Showers likely with a chance of thunderstorms. FRIDAY NIGHT East to southeast winds 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. A chance of showers and thunderstorms. SATURDAY East to southeast winds 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. A chance of showers and thunderstorms. SATURDAY NIGHT East to southeast winds near 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. A chance of showers and thunderstorms. $$
GMZ033-034-290830- 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- 422 PM EDT Mon Sep 28 2026 TONIGHT South to southwest winds 5 to 10 knots, becoming southeast to south. Seas around 1 foot. Wave Detail: Southwest 1 foot at 2 seconds. A chance of showers and thunderstorms. TUESDAY Southeast winds 5 to 10 knots, becoming southeast to south 10 to 15 knots. Seas 1 to 2 feet. Wave Detail: South 1 foot at 2 seconds. Showers likely with a chance of thunderstorms. TUESDAY NIGHT East to southeast winds 10 to 15 knots. Seas 1 to 2 feet. Wave Detail: Southeast 2 feet at 3 seconds and southwest 1 foot at 5 seconds. Showers likely with a chance of thunderstorms. WEDNESDAY East winds 10 to 15 knots, increasing to 15 to 20 knots. Seas 2 to 3 feet. Showers likely with a chance of thunderstorms. WEDNESDAY NIGHT East winds 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Showers likely with a chance of thunderstorms. THURSDAY East to southeast winds near 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Showers likely with a chance of thunderstorms. THURSDAY NIGHT East to southeast winds 15 to 20 knots. Seas 4 to 5 feet, occasionally to 6 feet. Showers likely with a chance of thunderstorms. FRIDAY East to southeast winds 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Showers likely with a chance of thunderstorms. FRIDAY NIGHT East to southeast winds 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. A chance of showers and thunderstorms. SATURDAY East to southeast winds 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. A chance of showers and thunderstorms. SATURDAY NIGHT East to southeast winds near 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. A chance of showers and thunderstorms. $$