GMZ005-301530-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1024 PM EST Mon Dec 29 2025
.SYNOPSIS...High pressure will continue to shift south through
the eastern Gulf overnight as a cold front approaches South
Florida. The front is expected to push southeastwards across Keys
waters Tuesday and Tuesday night and will lead to freshening
northerly breezes throughout all the Florida Keys coastal waters.
The exception will be our easternmost waters, likely holding off
until late Tuesday. Small Craft Advisories are becoming
increasingly likely for portions of Keys waters on Tuesday into
Tuesday night.
The Approximate Shoreward Edge of the Gulf Stream as of December
27...
18 NM South of Dry Tortugas Light...on Loggerhead Key.
11 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
12 NM South of Sand Key Light...off Key West.
12 NM South of Looe Key...off Big Pine Key.
13 NM Southeast of Sombrero Key Light...off Marathon.
8 NM Southeast of Alligator Reef Light...off Islamorada.
2 NM Southeast of Molasses Reef Light...off Key Largo.
2 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 and RTOFS.
$$
GMZ032-035-301530- Bayside and Gulfside from Craig Key to west end of Seven Mile Bridge- Gulf of America from west end of Seven Mile Bridge to Halfmoon Shoal out to 5 Fathoms- 1024 PM EST Mon Dec 29 2025 SMALL CRAFT ADVISORY MAY BE REQUIRED TUESDAY OVERNIGHT Northwest winds 5 to 10 knots, increasing to near 15 knots late. Seas 1 foot or less, building to 1 to 2 feet. Nearshore waters smooth to a light chop, becoming a moderate chop. Isolated showers. TUESDAY Northwest to north winds increasing to near 20 knots early. Seas building to 2 to 4 feet, occasionally to 5 feet. Nearshore waters becoming rough. Isolated showers. TUESDAY NIGHT North winds near 20 knots. Seas 3 to 5 feet, occasionally to 6 feet, except 5 to 6 feet, occasionally to 8 feet west of the Marquesas Keys. Nearshore waters rough. WEDNESDAY North winds near 20 knots, becoming northwest to north 10 to 15 knots in the afternoon. Seas 2 to 4 feet, occasionally to 5 feet, except 3 to 5 feet, occasionally to 6 feet west of the Marquesas Keys. Nearshore waters rough, becoming light to moderate chop. WEDNESDAY NIGHT Northwest to north winds 10 to 15 knots. Seas 2 to 3 feet, except around 3 feet west of the Marquesas Keys. Nearshore waters a light to moderate chop. THURSDAY North winds 10 to 15 knots, decreasing to 5 to 10 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate chop, becoming smooth to a light chop. THURSDAY NIGHT North winds 5 to 10 knots. Seas 1 to 2 feet. Nearshore waters smooth to a light chop. FRIDAY Northeast winds 5 to 10 knots. Seas 1 foot or less. Nearshore waters smooth. FRIDAY NIGHT East winds 5 to 10 knots. Seas 1 foot or less. Nearshore waters smooth. SATURDAY Southeast winds near 5 knots, becoming south to southwest in the afternoon. Seas 1 foot or less. Nearshore waters smooth. SATURDAY NIGHT Southwest to west winds near 5 knots. Seas 1 foot or less, then 1 foot or less after midnight. Nearshore waters smooth. $$
GMZ032-035-301530- 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- 1024 PM EST Mon Dec 29 2025 SMALL CRAFT ADVISORY MAY BE REQUIRED TUESDAY OVERNIGHT Northwest winds 5 to 10 knots, increasing to near 15 knots late. Seas 1 foot or less, building to 1 to 2 feet. Nearshore waters smooth to a light chop, becoming a moderate chop. Isolated showers. TUESDAY Northwest to north winds increasing to near 20 knots early. Seas building to 2 to 4 feet, occasionally to 5 feet. Nearshore waters becoming rough. Isolated showers. TUESDAY NIGHT North winds near 20 knots. Seas 3 to 5 feet, occasionally to 6 feet, except 5 to 6 feet, occasionally to 8 feet west of the Marquesas Keys. Nearshore waters rough. WEDNESDAY North winds near 20 knots, becoming northwest to north 10 to 15 knots in the afternoon. Seas 2 to 4 feet, occasionally to 5 feet, except 3 to 5 feet, occasionally to 6 feet west of the Marquesas Keys. Nearshore waters rough, becoming light to moderate chop. WEDNESDAY NIGHT Northwest to north winds 10 to 15 knots. Seas 2 to 3 feet, except around 3 feet west of the Marquesas Keys. Nearshore waters a light to moderate chop. THURSDAY North winds 10 to 15 knots, decreasing to 5 to 10 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate chop, becoming smooth to a light chop. THURSDAY NIGHT North winds 5 to 10 knots. Seas 1 to 2 feet. Nearshore waters smooth to a light chop. FRIDAY Northeast winds 5 to 10 knots. Seas 1 foot or less. Nearshore waters smooth. FRIDAY NIGHT East winds 5 to 10 knots. Seas 1 foot or less. Nearshore waters smooth. SATURDAY Southeast winds near 5 knots, becoming south to southwest in the afternoon. Seas 1 foot or less. Nearshore waters smooth. SATURDAY NIGHT Southwest to west winds near 5 knots. Seas 1 foot or less, then 1 foot or less after midnight. Nearshore waters smooth. $$