GMZ005-180330-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1023 AM EST Sat Jan 17 2026
.SYNOPSIS...High pressure centered over the western North Atlantic
will slowly loosen its grip across Florida this afternoon which
will support rapidly slackening breezes. The next cold front is
progged to push through the Florida Keys coastal waters on Sunday
or Sunday night. Fresh to strong (potentially near gale (SE
Gulf)) northerly breezes are forecast in its wake for the early
to the middle part of next week. An expansive high pressure system
will then move across the eastern United States. This will
continue to promote to fresh to strong breezes through the week.
The Approximate Shoreward Edge of the Gulf Stream as of January
12...
19 NM South of Dry Tortugas Light...on Loggerhead Key.
13 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
15 NM South of Sand Key Light...off Key West.
17 NM South of Looe Key...off Big Pine Key.
17 NM Southeast of Sombrero Key Light...off Marathon.
15 NM Southeast of Alligator Reef Light...off Islamorada.
10 NM Southeast of Molasses Reef Light...off Key Largo.
5 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>044-180330- 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- 1023 AM EST Sat Jan 17 2026 THIS AFTERNOON Northeast to east winds near 10 knots, decreasing to 5 to 10 knots. Seas 1 to 2 feet, except 2 to 3 feet west of Cosgrove Shoal Light. Nearshore waters a light chop, becoming smooth to a light chop. Isolated showers. TONIGHT Northeast winds 5 to 10 knots. Seas 1 to 2 feet. Nearshore waters smooth to a light chop. Isolated showers. SUNDAY North to northeast winds 5 to 10 knots, becoming northwest to north 20 to 25 knots in the afternoon. Seas around 1 foot, building to 2 to 3 feet. West of Cosgrove Shoal Light, seas 1 to 2 feet, building to 2 to 4 feet, occasionally to 5 feet. Nearshore waters smooth to a light chop, becoming very rough. Scattered showers. SUNDAY NIGHT North winds 20 to 25 knots. Seas 2 to 3 feet. West of Cosgrove Shoal Light, seas 4 to 5 feet, occasionally to 6 feet, building to 5 to 7 feet, occasionally to 9 feet. Nearshore waters very rough. Isolated showers. MONDAY North winds 20 to 25 knots, becoming north to northeast 15 to 20 knots in the afternoon. Seas 2 to 3 feet, except 5 to 6 feet, occasionally to 8 feet west of Cosgrove Shoal Light. Nearshore waters very rough, becoming choppy. MONDAY NIGHT North to northeast winds 15 to 20 knots, increasing to near 20 knots. Seas 2 to 3 feet, except 4 to 5 feet, occasionally to 6 feet west of Cosgrove Shoal Light. Nearshore waters choppy, becoming rough. TUESDAY North to northeast winds 20 to 25 knots. Seas 2 to 3 feet, except 4 to 6 feet, occasionally to 8 feet west of Cosgrove Shoal Light. Nearshore waters very rough. TUESDAY NIGHT Northeast winds 20 to 25 knots. Seas 2 to 4 feet, occasionally to 5 feet, except 5 to 6 feet, occasionally to 8 feet west of Cosgrove Shoal Light. Nearshore waters very rough. WEDNESDAY Northeast to east winds 20 to 25 knots. Seas 3 to 5 feet, occasionally to 6 feet, except 4 to 6 feet, occasionally to 8 feet west of Cosgrove Shoal Light. Nearshore waters very rough. Isolated showers. WEDNESDAY NIGHT Northeast to east winds near 20 knots, decreasing to 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Nearshore waters rough, becoming choppy. Isolated showers. $$
GMZ042>044-180330- 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- 1023 AM EST Sat Jan 17 2026 THIS AFTERNOON Northeast to east winds near 10 knots, decreasing to 5 to 10 knots. Seas 1 to 2 feet, except 2 to 3 feet west of Cosgrove Shoal Light. Nearshore waters a light chop, becoming smooth to a light chop. Isolated showers. TONIGHT Northeast winds 5 to 10 knots. Seas 1 to 2 feet. Nearshore waters smooth to a light chop. Isolated showers. SUNDAY North to northeast winds 5 to 10 knots, becoming northwest to north 20 to 25 knots in the afternoon. Seas around 1 foot, building to 2 to 3 feet. West of Cosgrove Shoal Light, seas 1 to 2 feet, building to 2 to 4 feet, occasionally to 5 feet. Nearshore waters smooth to a light chop, becoming very rough. Scattered showers. SUNDAY NIGHT North winds 20 to 25 knots. Seas 2 to 3 feet. West of Cosgrove Shoal Light, seas 4 to 5 feet, occasionally to 6 feet, building to 5 to 7 feet, occasionally to 9 feet. Nearshore waters very rough. Isolated showers. MONDAY North winds 20 to 25 knots, becoming north to northeast 15 to 20 knots in the afternoon. Seas 2 to 3 feet, except 5 to 6 feet, occasionally to 8 feet west of Cosgrove Shoal Light. Nearshore waters very rough, becoming choppy. MONDAY NIGHT North to northeast winds 15 to 20 knots, increasing to near 20 knots. Seas 2 to 3 feet, except 4 to 5 feet, occasionally to 6 feet west of Cosgrove Shoal Light. Nearshore waters choppy, becoming rough. TUESDAY North to northeast winds 20 to 25 knots. Seas 2 to 3 feet, except 4 to 6 feet, occasionally to 8 feet west of Cosgrove Shoal Light. Nearshore waters very rough. TUESDAY NIGHT Northeast winds 20 to 25 knots. Seas 2 to 4 feet, occasionally to 5 feet, except 5 to 6 feet, occasionally to 8 feet west of Cosgrove Shoal Light. Nearshore waters very rough. WEDNESDAY Northeast to east winds 20 to 25 knots. Seas 3 to 5 feet, occasionally to 6 feet, except 4 to 6 feet, occasionally to 8 feet west of Cosgrove Shoal Light. Nearshore waters very rough. Isolated showers. WEDNESDAY NIGHT Northeast to east winds near 20 knots, decreasing to 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Nearshore waters rough, becoming choppy. Isolated showers. $$