Hazardous marine condition(s):
Short Term Forecast
GMZ005-110845-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
434 PM EDT Fri Oct 10 2025
.SYNOPSIS...A low- and mid-level trough located over western Cuba
will continue to slowly drift northeastward tonight. This will
support bouts of elevated rain and thunder chances. The system
will develop into an area of low pressure off the coast of
Florida, with southeasterly light to gentle breezes gradually
backing to the northwest to north over the weekend. The low
pressure system will continue organizing and strengthening as it
heads northeastward adjacent to the Mid- Atlantic coast. As it
does this, it will drive an early season cold front towards the
Keys, further shifting winds to the north to northeast. Northerly
swells will be possible in our western marine zones today and
through the weekend due to the influence of the low pressure
system.
The Approximate Shoreward Edge of the Gulf Stream as of October
08...
46 NM South of Dry Tortugas Light...on Loggerhead Key.
27 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
21 NM South of Sand Key Light...off Key West.
30 NM South of Looe Key...off Big Pine Key.
14 NM Southeast of Sombrero Key Light...off Marathon.
8 NM Southeast of Alligator Reef Light...off Islamorada.
7 NM Southeast of Molasses Reef Light...off Key Largo.
6 NM Southeast of Carysfort Reef Light...off Ocean Reef.
Gulf Stream Information Courtesy of the National Weather Service in
Key West based on products from NASA SPoRT.
$$
GMZ032-035-110845- Bayside and Gulfside from Craig Key to west end of Seven Mile Bridge- Gulf of America from west end of Seven Mile Bridge to Halfmoon Shoal out to 5 Fathoms- 434 PM EDT Fri Oct 10 2025 TONIGHT Southwest to west winds 5 to 10 knots. Seas around 1 foot. Nearshore waters smooth to a light chop. Numerous showers and scattered thunderstorms. SATURDAY Southwest to west winds 5 to 10 knots, becoming west to northwest. Seas building to 1 to 2 feet, except building to 2 to 3 feet west of the Marquesas Keys due to a northerly swell. Nearshore waters smooth to a light chop. Numerous showers and scattered thunderstorms in the morning, then scattered showers and isolated thunderstorms in the afternoon. SATURDAY NIGHT Northwest winds 5 to 10 knots. Seas 1 to 2 feet, except 2 to 3 feet west of the Marquesas Keys. Nearshore waters smooth to a light chop. Isolated showers. SUNDAY Northwest to north winds near 5 knots. Seas 1 to 2 feet. Nearshore waters smooth. Isolated showers. SUNDAY NIGHT North winds 5 to 10 knots, becoming north to northeast. Seas 1 to 2 feet. Nearshore waters smooth to a light chop. Isolated showers. MONDAY North to northeast winds 5 to 10 knots, becoming northeast. Seas 1 to 2 feet. Nearshore waters smooth to a light chop. Isolated showers. MONDAY NIGHT Northeast to east winds near 10 knots, increasing to 10 to 15 knots. Seas 1 to 2 feet, except around 2 feet west of the Marquesas Keys. Nearshore waters a light chop, becoming a light to moderate chop. Isolated showers. TUESDAY Northeast winds near 15 knots. Seas 1 to 2 feet, except 2 to 3 feet west of the Marquesas Keys. Nearshore waters a moderate chop. Isolated showers. TUESDAY NIGHT THROUGH WEDNESDAY NIGHT Northeast winds 15 to 20 knots. Seas 2 to 3 feet. Nearshore waters choppy. Isolated showers. $$
GMZ032-035-110845- Bayside and Gulfside from Craig Key to west end of Seven Mile Bridge- Gulf of America from west end of Seven Mile Bridge to Halfmoon Shoal out to 5 Fathoms- 434 PM EDT Fri Oct 10 2025 TONIGHT Southwest to west winds 5 to 10 knots. Seas around 1 foot. Nearshore waters smooth to a light chop. Numerous showers and scattered thunderstorms. SATURDAY Southwest to west winds 5 to 10 knots, becoming west to northwest. Seas building to 1 to 2 feet, except building to 2 to 3 feet west of the Marquesas Keys due to a northerly swell. Nearshore waters smooth to a light chop. Numerous showers and scattered thunderstorms in the morning, then scattered showers and isolated thunderstorms in the afternoon. SATURDAY NIGHT Northwest winds 5 to 10 knots. Seas 1 to 2 feet, except 2 to 3 feet west of the Marquesas Keys. Nearshore waters smooth to a light chop. Isolated showers. SUNDAY Northwest to north winds near 5 knots. Seas 1 to 2 feet. Nearshore waters smooth. Isolated showers. SUNDAY NIGHT North winds 5 to 10 knots, becoming north to northeast. Seas 1 to 2 feet. Nearshore waters smooth to a light chop. Isolated showers. MONDAY North to northeast winds 5 to 10 knots, becoming northeast. Seas 1 to 2 feet. Nearshore waters smooth to a light chop. Isolated showers. MONDAY NIGHT Northeast to east winds near 10 knots, increasing to 10 to 15 knots. Seas 1 to 2 feet, except around 2 feet west of the Marquesas Keys. Nearshore waters a light chop, becoming a light to moderate chop. Isolated showers. TUESDAY Northeast winds near 15 knots. Seas 1 to 2 feet, except 2 to 3 feet west of the Marquesas Keys. Nearshore waters a moderate chop. Isolated showers. TUESDAY NIGHT THROUGH WEDNESDAY NIGHT Northeast winds 15 to 20 knots. Seas 2 to 3 feet. Nearshore waters choppy. Isolated showers. $$