Hazardous marine condition(s):
Short Term Forecast
GMZ005-122030-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
417 AM EDT Sat Sep 12 2026
.SYNOPSIS...
Ridging across the southeastern United States and Florida will
maintain light to gentle east to southeasterly breezes over the
next few days. Low level moisture will remain abundant and keep
convective potential slightly above normal today, but fall back to
near normal early in the week as drier lower levels filter in.
The ridge will be reinforced late in the forecast and may drive
freshening northeast to easterly breezes.
The Approximate Shoreward Edge of the Gulf Stream as of September
11, 2026...
26 NM south of Dry Tortugas Light, on Loggerhead Key
15 NM south of Cosgrove Shoal Light, off the Marquesas Keys
15 NM south of Sand Key Light, off Key West
11 NM south-southeast of Looe Key, off Big Pine Key
8 NM southeast 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 east-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.
$$
GMZ042>044-122030- Hawk Channel from Ocean Reef to Craig Key out to the reef- Hawk Channel from Craig Key to west end of Seven Mile Bridge out to the reef- Hawk Channel from west end of Seven Mile Bridge to Halfmoon Shoal out to the reef- 417 AM EDT Sat Sep 12 2026 TODAY Southeast winds near 10 knots, becoming east near 5 knots. Seas around 1 foot. Nearshore waters a light chop, becoming smooth. A chance of showers and thunderstorms. TONIGHT East to southeast winds 5 to 10 knots. Seas around 1 foot. Nearshore waters smooth to a light chop. A chance of showers and thunderstorms. SUNDAY Southeast to south winds near 5 knots, becoming east in the afternoon. Seas 1 foot or less. Nearshore waters smooth. A chance of showers and thunderstorms. SUNDAY NIGHT East winds 5 to 10 knots. Seas 1 foot or less. Nearshore waters smooth to a light chop. A chance of showers and thunderstorms. MONDAY East winds near 5 knots. Seas around 1 foot. Nearshore waters smooth. A chance of showers and thunderstorms. MONDAY NIGHT East winds 5 to 10 knots, increasing to near 10 knots. Seas around 1 foot. Nearshore waters smooth to a light chop, becoming a light chop. A chance of showers and thunderstorms. TUESDAY East winds 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate chop. A chance of showers and thunderstorms. TUESDAY NIGHT Northeast to east winds near 15 knots. Seas 2 to 3 feet. Nearshore waters a moderate chop. Showers likely with a chance of thunderstorms. WEDNESDAY Northeast to east winds 10 to 15 knots. Seas 2 to 3 feet. Nearshore waters a light to moderate chop. Showers with a chance of thunderstorms. WEDNESDAY NIGHT Northeast to east winds 15 to 20 knots, decreasing to 10 to 15 knots. Seas 2 to 3 feet. Nearshore waters choppy, becoming a light to moderate chop. Showers with a chance of thunderstorms. $$
GMZ042>044-122030- Hawk Channel from Ocean Reef to Craig Key out to the reef- Hawk Channel from Craig Key to west end of Seven Mile Bridge out to the reef- Hawk Channel from west end of Seven Mile Bridge to Halfmoon Shoal out to the reef- 417 AM EDT Sat Sep 12 2026 TODAY Southeast winds near 10 knots, becoming east near 5 knots. Seas around 1 foot. Nearshore waters a light chop, becoming smooth. A chance of showers and thunderstorms. TONIGHT East to southeast winds 5 to 10 knots. Seas around 1 foot. Nearshore waters smooth to a light chop. A chance of showers and thunderstorms. SUNDAY Southeast to south winds near 5 knots, becoming east in the afternoon. Seas 1 foot or less. Nearshore waters smooth. A chance of showers and thunderstorms. SUNDAY NIGHT East winds 5 to 10 knots. Seas 1 foot or less. Nearshore waters smooth to a light chop. A chance of showers and thunderstorms. MONDAY East winds near 5 knots. Seas around 1 foot. Nearshore waters smooth. A chance of showers and thunderstorms. MONDAY NIGHT East winds 5 to 10 knots, increasing to near 10 knots. Seas around 1 foot. Nearshore waters smooth to a light chop, becoming a light chop. A chance of showers and thunderstorms. TUESDAY East winds 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate chop. A chance of showers and thunderstorms. TUESDAY NIGHT Northeast to east winds near 15 knots. Seas 2 to 3 feet. Nearshore waters a moderate chop. Showers likely with a chance of thunderstorms. WEDNESDAY Northeast to east winds 10 to 15 knots. Seas 2 to 3 feet. Nearshore waters a light to moderate chop. Showers with a chance of thunderstorms. WEDNESDAY NIGHT Northeast to east winds 15 to 20 knots, decreasing to 10 to 15 knots. Seas 2 to 3 feet. Nearshore waters choppy, becoming a light to moderate chop. Showers with a chance of thunderstorms. $$