GMZ005-190900-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
449 PM EDT Sat Jul 18 2026
.SYNOPSIS...A broad area of low pressure over the eastern Gulf of
America will shift northward from tonight through Monday, with
prevailing gentle to moderate south to southeasterly breezes
across Florida Keys coastal waters. An Atlantic high pressure
ridge will extend to the Florida Peninsula for the next several
days. Gentle southeasterly breezes are expected to prevail across
Keys coastal waters Monday night through Thursday, with overnight
surges and afternoon lulls.
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.
$$
GMZ033-034-190900- Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM out and beyond 5 fathoms- Gulf of America including Dry Tortugas and Rebecca Shoal Channel- 449 PM EDT Sat Jul 18 2026 TONIGHT Southeast winds 5 to 10 knots, becoming southeast to south and increasing to 10 to 15 knots after midnight. Seas 1 to 2 feet. Wave Detail: Southeast 2 feet at 4 seconds and northwest 1 foot at 5 seconds. A chance of showers and thunderstorms. SUNDAY Southeast to south winds 10 to 15 knots, becoming south and decreasing to 5 to 10 knots in the afternoon. Seas 1 to 2 feet. Wave Detail: Southeast 2 feet at 4 seconds and northwest 1 foot at 5 seconds. A chance of showers and thunderstorms. SUNDAY NIGHT South winds 5 to 10 knots. Seas around 1 foot. Wave Detail: Southeast to south 1 foot at 3 seconds and northwest 1 foot at 4 seconds. A chance of showers with a slight chance of thunderstorms. MONDAY South winds 5 to 10 knots. Seas 1 to 2 feet. A chance of showers with a slight chance of thunderstorms. MONDAY NIGHT South winds 5 to 10 knots, becoming southeast after midnight. Seas around 1 foot. TUESDAY Southeast winds 10 to 15 knots, becoming 5 to 10 knots in the afternoon. Seas 1 to 2 feet. TUESDAY NIGHT Southeast winds 5 to 10 knots. Seas around 1 foot. WEDNESDAY Southeast winds 5 to 10 knots. Seas around 1 foot. WEDNESDAY NIGHT East to southeast winds near 5 knots. Seas around 1 foot. THURSDAY East to southeast winds near 5 knots. Seas 1 foot or less. THURSDAY NIGHT East to southeast winds 5 to 10 knots. Seas around 1 foot. A slight chance of showers and thunderstorms. $$
GMZ033-034-190900- 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- 449 PM EDT Sat Jul 18 2026 TONIGHT Southeast winds 5 to 10 knots, becoming southeast to south and increasing to 10 to 15 knots after midnight. Seas 1 to 2 feet. Wave Detail: Southeast 2 feet at 4 seconds and northwest 1 foot at 5 seconds. A chance of showers and thunderstorms. SUNDAY Southeast to south winds 10 to 15 knots, becoming south and decreasing to 5 to 10 knots in the afternoon. Seas 1 to 2 feet. Wave Detail: Southeast 2 feet at 4 seconds and northwest 1 foot at 5 seconds. A chance of showers and thunderstorms. SUNDAY NIGHT South winds 5 to 10 knots. Seas around 1 foot. Wave Detail: Southeast to south 1 foot at 3 seconds and northwest 1 foot at 4 seconds. A chance of showers with a slight chance of thunderstorms. MONDAY South winds 5 to 10 knots. Seas 1 to 2 feet. A chance of showers with a slight chance of thunderstorms. MONDAY NIGHT South winds 5 to 10 knots, becoming southeast after midnight. Seas around 1 foot. TUESDAY Southeast winds 10 to 15 knots, becoming 5 to 10 knots in the afternoon. Seas 1 to 2 feet. TUESDAY NIGHT Southeast winds 5 to 10 knots. Seas around 1 foot. WEDNESDAY Southeast winds 5 to 10 knots. Seas around 1 foot. WEDNESDAY NIGHT East to southeast winds near 5 knots. Seas around 1 foot. THURSDAY East to southeast winds near 5 knots. Seas 1 foot or less. THURSDAY NIGHT East to southeast winds 5 to 10 knots. Seas around 1 foot. A slight chance of showers and thunderstorms. $$