GMZ005-101530-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1027 PM EST Tue Dec 9 2025
.SYNOPSIS...Moderate north to northeast breezes are expected to
continue into the overnight hours as a frontal boundary remains
draped across the Straits of Florida. As the front slides eastward
and away from the Florida Keys marine zones during the early
morning, breezes will slacken. A second weak front will push
through the coastal waters late Wednesday and Wednesday night,
with modestly freshened northwesterly breezes clocking around to
the northeast to east for late week and into the weekend.
The Approximate Shoreward Edge of the Gulf Stream as of December 8...
15 NM South of Dry Tortugas Light...on Loggerhead Key.
13 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
14 NM South of Sand Key Light...off Key West.
18 NM South of Looe Key...off Big Pine Key.
23 NM Southeast of Sombrero Key Light...off Marathon.
18 NM Southeast of Alligator Reef Light...off Islamorada.
12 NM Southeast of Molasses Reef Light...off Key Largo.
8 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.
$$
GMZ042>044-101530- 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- 1027 PM EST Tue Dec 9 2025 SMALL CRAFT SHOULD EXERCISE CAUTION UNTIL WINDS DECREASE OVERNIGHT Northeast winds 15 to 20 knots early, decreasing to 10 to 15 knots. Seas 2 to 3 feet, subsiding to around 2 feet. West of Cosgrove Shoal Light, seas 3 to 4 feet, subsiding to 2 to 3 feet. Nearshore waters choppy, becoming a light to moderate chop late. Scattered showers, mainly early. WEDNESDAY North to northeast winds near 10 knots, becoming northwest to north and decreasing to 5 to 10 knots. Seas subsiding to 1 to 2 feet. Nearshore waters a light chop, becoming smooth to a light chop. Isolated showers. WEDNESDAY NIGHT Northwest to north winds near 10 knots, increasing to 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a light chop, becoming a light to moderate chop. Isolated showers. THURSDAY North winds near 10 knots. Seas 1 to 2 feet. Nearshore waters a light chop. THURSDAY NIGHT North to northeast winds 5 to 10 knots. Seas around 1 foot. Nearshore waters smooth to a light chop. FRIDAY Northeast to east winds 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate chop. FRIDAY NIGHT East winds 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate chop. Isolated showers. SATURDAY East winds 10 to 15 knots. Seas around 2 feet. Nearshore waters a light to moderate chop. Scattered showers. SATURDAY NIGHT Northeast to east winds near 15 knots. Seas 2 to 3 feet. Nearshore waters a moderate chop. Scattered showers. SUNDAY North to northeast winds near 10 knots. Seas 1 to 2 feet. Nearshore waters a light chop. Scattered showers. SUNDAY NIGHT Northeast winds 10 to 15 knots, increasing to near 15 knots. Seas building to 2 to 3 feet, except building to 3 to 4 feet west of Cosgrove Shoal Light. Nearshore waters a light to moderate chop, becoming a moderate chop. Isolated showers. $$
GMZ042>044-101530- 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- 1027 PM EST Tue Dec 9 2025 SMALL CRAFT SHOULD EXERCISE CAUTION UNTIL WINDS DECREASE OVERNIGHT Northeast winds 15 to 20 knots early, decreasing to 10 to 15 knots. Seas 2 to 3 feet, subsiding to around 2 feet. West of Cosgrove Shoal Light, seas 3 to 4 feet, subsiding to 2 to 3 feet. Nearshore waters choppy, becoming a light to moderate chop late. Scattered showers, mainly early. WEDNESDAY North to northeast winds near 10 knots, becoming northwest to north and decreasing to 5 to 10 knots. Seas subsiding to 1 to 2 feet. Nearshore waters a light chop, becoming smooth to a light chop. Isolated showers. WEDNESDAY NIGHT Northwest to north winds near 10 knots, increasing to 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a light chop, becoming a light to moderate chop. Isolated showers. THURSDAY North winds near 10 knots. Seas 1 to 2 feet. Nearshore waters a light chop. THURSDAY NIGHT North to northeast winds 5 to 10 knots. Seas around 1 foot. Nearshore waters smooth to a light chop. FRIDAY Northeast to east winds 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate chop. FRIDAY NIGHT East winds 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate chop. Isolated showers. SATURDAY East winds 10 to 15 knots. Seas around 2 feet. Nearshore waters a light to moderate chop. Scattered showers. SATURDAY NIGHT Northeast to east winds near 15 knots. Seas 2 to 3 feet. Nearshore waters a moderate chop. Scattered showers. SUNDAY North to northeast winds near 10 knots. Seas 1 to 2 feet. Nearshore waters a light chop. Scattered showers. SUNDAY NIGHT Northeast winds 10 to 15 knots, increasing to near 15 knots. Seas building to 2 to 3 feet, except building to 3 to 4 feet west of Cosgrove Shoal Light. Nearshore waters a light to moderate chop, becoming a moderate chop. Isolated showers. $$