Hazardous marine condition(s):
Short Term Forecast
GMZ005-210845-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
438 PM EDT Sun Sep 20 2026
.SYNOPSIS...
A wet weather pattern will persist across the Florida Keys
coastal waters for the next several days as an upper- level low
lingers in the eastern Gulf waters. As a result, the main hazards
from scattered to numerous showers and thunderstorms will be a
daily occurence with gusty winds, lightning strikes, blinding
downpours, and locally hazardous seas. Breezes will generally
remain light to gentle into the new week but brief periods of
moderate breezes may occur in the evening hours.
The Approximate Shoreward Edge of the Gulf Stream as of September
15, 2026...
64 NM south-southeast of Dry Tortugas Light, on Loggerhead Key
40 NM south-southeast of Cosgrove Shoal Light, off the Marquesas Keys
36 NM south-southeast of Sand Key Light, off Key West
35 NM southeast of Looe Key, off Big Pine Key
28 NM southeast of Sombrero Key Light, off Marathon
15 NM east-southeast of Alligator Reef Light, off Islamorada
8 NM east-southeast of Molasses Reef Light, off Key Largo
5 NM east-southeast of Carysfort Reef Light, off Ocean Reef
Gulf Stream Information Courtesy of the Naval Oceanographic Office.
$$
GMZ033-034-210845- Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM out and beyond 5 fathoms- Gulf of America including Dry Tortugas and Rebecca Shoal Channel- 438 PM EDT Sun Sep 20 2026 TONIGHT Northeast to east winds near 5 knots, becoming southeast near 5 knots late this evening, then becoming south after midnight. Seas 1 foot or less. Wave Detail: South 1 foot at 3 seconds. A chance of showers and thunderstorms. MONDAY South to southwest winds near 5 knots. Seas 1 foot or less. Wave Detail: South 1 foot at 3 seconds. A chance of showers and thunderstorms. MONDAY NIGHT Southeast to south winds 5 to 10 knots. Seas around 1 foot. Wave Detail: Southeast to south 1 foot at 3 seconds. Showers likely with a chance of thunderstorms. TUESDAY South winds 5 to 10 knots. Seas around 1 foot. Showers likely with a chance of thunderstorms. TUESDAY NIGHT AND WEDNESDAY Southeast to south winds 5 to 10 knots. Seas around 1 foot. Showers likely with a chance of thunderstorms. WEDNESDAY NIGHT Southeast winds near 5 knots. Seas 1 foot or less. Showers likely with a chance of thunderstorms. THURSDAY East to southeast winds near 5 knots. Seas 1 foot or less. A chance of thunderstorms. A chance of showers. THURSDAY NIGHT East winds near 5 knots. Seas 1 foot or less. A chance of showers and thunderstorms. FRIDAY AND FRIDAY NIGHT Northeast to east winds 5 to 10 knots. Seas 1 to 2 feet. A chance of showers and thunderstorms. $$
GMZ033-034-210845- 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- 438 PM EDT Sun Sep 20 2026 TONIGHT Northeast to east winds near 5 knots, becoming southeast near 5 knots late this evening, then becoming south after midnight. Seas 1 foot or less. Wave Detail: South 1 foot at 3 seconds. A chance of showers and thunderstorms. MONDAY South to southwest winds near 5 knots. Seas 1 foot or less. Wave Detail: South 1 foot at 3 seconds. A chance of showers and thunderstorms. MONDAY NIGHT Southeast to south winds 5 to 10 knots. Seas around 1 foot. Wave Detail: Southeast to south 1 foot at 3 seconds. Showers likely with a chance of thunderstorms. TUESDAY South winds 5 to 10 knots. Seas around 1 foot. Showers likely with a chance of thunderstorms. TUESDAY NIGHT AND WEDNESDAY Southeast to south winds 5 to 10 knots. Seas around 1 foot. Showers likely with a chance of thunderstorms. WEDNESDAY NIGHT Southeast winds near 5 knots. Seas 1 foot or less. Showers likely with a chance of thunderstorms. THURSDAY East to southeast winds near 5 knots. Seas 1 foot or less. A chance of thunderstorms. A chance of showers. THURSDAY NIGHT East winds near 5 knots. Seas 1 foot or less. A chance of showers and thunderstorms. FRIDAY AND FRIDAY NIGHT Northeast to east winds 5 to 10 knots. Seas 1 to 2 feet. A chance of showers and thunderstorms. $$