Hazardous marine condition(s):
Short Term Forecast
GMZ005-190230-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1033 AM EDT Sat Jul 18 2026
.SYNOPSIS...A trough of low pressure over the eastern Gulf of
America will shift northward from this afternoon 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 Wednesday, 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.
$$
GMZ033-034-190230- Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM out and beyond 5 fathoms- Gulf of America including Dry Tortugas and Rebecca Shoal Channel- 1033 AM EDT Sat Jul 18 2026 THIS AFTERNOON South to southwest winds near 15 knots. Seas 2 to 3 feet. Wave Detail: South 2 feet at 3 seconds and northwest 1 foot at 5 seconds. A chance of showers and thunderstorms. Winds and seas higher in and near showers and thunderstorms. TONIGHT Southeast winds 5 to 10 knots, becoming southeast to south and increasing to 10 to 15 knots after midnight. Seas 1 to 2 feet, building to around 2 feet. Wave Detail: Southeast 2 feet at 4 seconds and northwest 1 foot at 5 seconds. A chance of showers and thunderstorms. SUNDAY Southeast to south winds 10 to 15 knots, becoming south and decreasing to 5 to 10 knots in the afternoon. Seas around 2 feet, subsiding to 1 to 2 feet. Wave Detail: Southeast 2 feet at 4 seconds and northwest 1 foot at 5 seconds. A chance of showers and thunderstorms. SUNDAY NIGHT South winds 5 to 10 knots, increasing to near 10 knots. Seas 1 to 2 feet. A chance of showers with a slight chance of thunderstorms. MONDAY South winds near 10 knots, becoming south to southwest and decreasing to 5 to 10 knots. Seas 1 to 2 feet. A chance of showers with a slight chance of thunderstorms. MONDAY NIGHT South to southwest winds 5 to 10 knots, becoming southeast and increasing to 10 to 15 knots after midnight. Seas around 1 foot, building to 1 to 2 feet. TUESDAY Southeast winds 10 to 15 knots, decreasing to 5 to 10 knots in the afternoon. Seas 1 to 2 feet, subsiding to around 1 foot. TUESDAY NIGHT Southeast winds 5 to 10 knots. Seas around 1 foot. WEDNESDAY East to southeast winds 5 to 10 knots. Seas 1 foot or less. WEDNESDAY NIGHT East to southeast winds near 5 knots. Seas 1 foot or less. A slight chance of showers. $$
GMZ033-034-190230- 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- 1033 AM EDT Sat Jul 18 2026 THIS AFTERNOON South to southwest winds near 15 knots. Seas 2 to 3 feet. Wave Detail: South 2 feet at 3 seconds and northwest 1 foot at 5 seconds. A chance of showers and thunderstorms. Winds and seas higher in and near showers and thunderstorms. 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, building to around 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 around 2 feet, subsiding to 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, increasing to near 10 knots. Seas 1 to 2 feet. A chance of showers with a slight chance of thunderstorms. MONDAY South winds near 10 knots, becoming south to southwest and decreasing to 5 to 10 knots. Seas 1 to 2 feet. A chance of showers with a slight chance of thunderstorms. MONDAY NIGHT South to southwest winds 5 to 10 knots, becoming southeast and increasing to 10 to 15 knots after midnight. Seas around 1 foot, building to 1 to 2 feet. TUESDAY Southeast winds 10 to 15 knots, decreasing to 5 to 10 knots in the afternoon. Seas 1 to 2 feet, subsiding to around 1 foot. TUESDAY NIGHT Southeast winds 5 to 10 knots. Seas around 1 foot. WEDNESDAY East to southeast winds 5 to 10 knots. Seas 1 foot or less. WEDNESDAY NIGHT East to southeast winds near 5 knots. Seas 1 foot or less. A slight chance of showers. $$