GMZ005-300930-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
418 PM EST Mon Dec 29 2025
.SYNOPSIS...High pressure will shift south through the eastern
Gulf tonight as a cold front approaches South Florida resulting
in northwest breezes. The front is expected to push southeastwards
across Keys waters Tuesday and Tuesday night. This will lead to
freshening northerly breezes throughout all the Florida Keys
coastal waters, with 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.
$$
GMZ052-072-300930- Straits of Florida from Ocean Reef to Craig Key out 20 NM- Straits of Florida from Ocean Reef to Craig Key 20 to 60 NM out- 418 PM EST Mon Dec 29 2025 TONIGHT Northwest winds 5 to 10 knots, increasing to near 10 knots. Seas building to 1 to 2 feet. Wave Detail: Northwest to north 1 foot at 2 seconds and northeast 1 foot at 8 seconds. TUESDAY Northwest winds increasing to near 15 knots early. Seas building to 2 to 3 feet. Wave Detail: Northwest to north 2 feet at 3 seconds and north to northeast 1 foot at 10 seconds. Isolated showers. TUESDAY NIGHT Northwest to north winds near 15 knots, increasing to near 20 knots. Seas 2 to 4 feet, occasionally to 5 feet, building to 5 to 6 feet, occasionally to 7 feet. Wave Detail: Northwest 2 feet at 3 seconds and north to northeast 1 foot at 6 seconds, becoming north 2 feet at 5 seconds. WEDNESDAY North winds near 20 knots, becoming northwest to north 10 to 15 knots in the afternoon. Seas 5 to 6 feet, occasionally to 7 feet, subsiding to 2 to 4 feet, occasionally to 5 feet. WEDNESDAY NIGHT Northwest to north winds 10 to 15 knots. Seas 2 to 3 feet. THURSDAY Northwest to north winds near 15 knots, decreasing to near 10 knots. Seas 2 to 3 feet. THURSDAY NIGHT North winds near 10 knots. Seas 1 to 2 feet. FRIDAY North to northeast winds 5 to 10 knots. Seas 1 to 2 feet. FRIDAY NIGHT East winds 5 to 10 knots. Seas 1 to 2 feet. SATURDAY South winds near 5 knots. Seas around 1 foot. SATURDAY NIGHT Southwest to west winds 5 to 10 knots. Seas 1 foot or less. $$
GMZ052-072-300930- Straits of Florida from Ocean Reef to Craig Key out 20 NM- Straits of Florida from Ocean Reef to Craig Key 20 to 60 NM out- 418 PM EST Mon Dec 29 2025 TONIGHT Northwest winds 5 to 10 knots, increasing to near 10 knots. Seas building to 1 to 2 feet. Wave Detail: Northwest to north 1 foot at 2 seconds and northeast 1 foot at 8 seconds. TUESDAY Northwest winds increasing to near 15 knots early. Seas building to 2 to 3 feet. Wave Detail: Northwest to north 2 feet at 3 seconds and north to northeast 1 foot at 10 seconds. Isolated showers. TUESDAY NIGHT Northwest to north winds near 15 knots, increasing to near 20 knots. Seas 2 to 4 feet, occasionally to 5 feet, building to 5 to 6 feet, occasionally to 7 feet. Wave Detail: Northwest 2 feet at 3 seconds and north to northeast 1 foot at 6 seconds, becoming north 2 feet at 5 seconds. WEDNESDAY North winds near 20 knots, becoming northwest to north 10 to 15 knots in the afternoon. Seas 5 to 6 feet, occasionally to 7 feet, subsiding to 2 to 4 feet, occasionally to 5 feet. WEDNESDAY NIGHT Northwest to north winds 10 to 15 knots. Seas 2 to 3 feet. THURSDAY Northwest to north winds near 15 knots, decreasing to near 10 knots. Seas 2 to 3 feet. THURSDAY NIGHT North winds near 10 knots. Seas 1 to 2 feet. FRIDAY North to northeast winds 5 to 10 knots. Seas 1 to 2 feet. FRIDAY NIGHT East winds 5 to 10 knots. Seas 1 to 2 feet. SATURDAY South winds near 5 knots. Seas around 1 foot. SATURDAY NIGHT Southwest to west winds 5 to 10 knots. Seas 1 foot or less. $$