GMZ005-220830-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1028 PM EDT Tue Jul 21 2026
.SYNOPSIS...As of 8 PM EDT, Tropical Storm Bertha was centered
over the northern Gulf waters. Bertha is expected to continue
moving slowly to the west-northwest or west tonight through
Friday, moving Tropical Storm Berth near or along the northern
Gulf coast. Otherwise, an Atlantic ridge of high pressure will
extend to the Florida Peninsula for the next several days.
Gentle breezes will briefly become moderate overnight through
early Thursday, then gradually slacken to light to gentle breezes
by Friday, peaking overnight and lull during the day. Light winds
are expected this weekend.
The Approximate Shoreward Edge of the Gulf Stream as of July 17,
2026...
49 NM South of Dry Tortugas Light...on Loggerhead Key.
51 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
38 NM South of Sand Key Light...off Key West.
22 NM South of Looe Key...off Big Pine Key.
13 NM South of Sombrero Key Light...off Marathon.
6 NM Southeast of Alligator Reef Light...off Islamorada.
2 NM Southeast of Molasses Reef Light...off Key Largo.
1 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.
$$
GMZ033-034-220830- Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM out and beyond 5 fathoms- Gulf of America including Dry Tortugas and Rebecca Shoal Channel- 1028 PM EDT Tue Jul 21 2026 OVERNIGHT Southeast to south winds near 10 knots, becoming southeast and increasing to 10 to 15 knots. Seas 2 to 3 feet. Wave Detail: West to northwest 3 feet at 7 seconds and southeast 2 feet at 4 seconds. WEDNESDAY Southeast winds 10 to 15 knots. Seas 2 to 3 feet. Wave Detail: Southeast 2 feet at 4 seconds and west 2 feet at 6 seconds. A slight chance of showers and thunderstorms. WEDNESDAY NIGHT East to southeast winds 10 to 15 knots. Seas 2 to 3 feet. Wave Detail: East to southeast 2 feet at 4 seconds and west 2 feet at 7 seconds. A slight chance of showers and thunderstorms. THURSDAY East winds near 10 knots, decreasing to 5 to 10 knots. Seas 2 to 3 feet. A slight chance of showers and thunderstorms. THURSDAY NIGHT Northeast to east winds 5 to 10 knots. Seas around 2 feet. A chance of showers and thunderstorms. FRIDAY East winds 5 to 10 knots. Seas 1 to 2 feet. A chance of showers and thunderstorms. FRIDAY NIGHT East to southeast winds 5 to 10 knots. Seas 1 to 2 feet. A slight chance of showers and thunderstorms. SATURDAY Southeast to south winds near 5 knots. Seas around 1 foot. SATURDAY NIGHT North to northeast winds near 5 knots, becoming south after midnight. Seas around 1 foot. SUNDAY Northwest winds near 5 knots. Seas around 1 foot. A slight chance of showers. SUNDAY NIGHT Northwest winds 5 to 10 knots. Seas 1 foot or less. A slight chance of showers and thunderstorms. $$
GMZ033-034-220830- 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- 1028 PM EDT Tue Jul 21 2026 OVERNIGHT Southeast to south winds near 10 knots, becoming southeast and increasing to 10 to 15 knots. Seas 2 to 3 feet. Wave Detail: West to northwest 3 feet at 7 seconds and southeast 2 feet at 4 seconds. WEDNESDAY Southeast winds 10 to 15 knots. Seas 2 to 3 feet. Wave Detail: Southeast 2 feet at 4 seconds and west 2 feet at 6 seconds. A slight chance of showers and thunderstorms. WEDNESDAY NIGHT East to southeast winds 10 to 15 knots. Seas 2 to 3 feet. Wave Detail: East to southeast 2 feet at 4 seconds and west 2 feet at 7 seconds. A slight chance of showers and thunderstorms. THURSDAY East winds near 10 knots, decreasing to 5 to 10 knots. Seas 2 to 3 feet. A slight chance of showers and thunderstorms. THURSDAY NIGHT Northeast to east winds 5 to 10 knots. Seas around 2 feet. A chance of showers and thunderstorms. FRIDAY East winds 5 to 10 knots. Seas 1 to 2 feet. A chance of showers and thunderstorms. FRIDAY NIGHT East to southeast winds 5 to 10 knots. Seas 1 to 2 feet. A slight chance of showers and thunderstorms. SATURDAY Southeast to south winds near 5 knots. Seas around 1 foot. SATURDAY NIGHT North to northeast winds near 5 knots, becoming south after midnight. Seas around 1 foot. SUNDAY Northwest winds near 5 knots. Seas around 1 foot. A slight chance of showers. SUNDAY NIGHT Northwest winds 5 to 10 knots. Seas 1 foot or less. A slight chance of showers and thunderstorms. $$