Hazardous marine condition(s):
Small Craft Advisory
GMZ005-220330-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1018 AM EST Wed Jan 21 2026
.SYNOPSIS...A broad high pressure system located over the
Carolinas will slowly weaken as it slides into the western
Atlantic during the work week. Breezes will slacken as the
pressure gradient diminishes, and gentle to moderate breezes are
expected across the nearshore and offshore waters by Thursday.
Weekend conditions are more uncertain because a sequence of
strong low pressure systems over the southeastern United States.
A col region could form over the Keys on Sunday and support light
to gentle breezes, or the Keys could be stuck under gentle to
moderate northwesterlies.
The Approximate Shoreward Edge of the Gulf Stream as of January
18...
18 NM South of Dry Tortugas Light...on Loggerhead Key.
16 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
15 NM South of Sand Key Light...off Key West.
13 NM South of Looe Key...off Big Pine Key.
13 NM Southeast of Sombrero Key Light...off Marathon.
12 NM Southeast of Alligator Reef Light...off Islamorada.
7 NM Southeast of Molasses Reef Light...off Key Largo.
4 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>055-072>075-220330- Straits of Florida from Ocean Reef to Craig Key out 20 NM- Straits of Florida from Craig Key to west end of Seven Mile Bridge out 20 NM- Straits of Florida from west end of Seven Mile Bridge to south of Halfmoon Shoal out 20 NM- Straits of Florida from Halfmoon Shoal to 20 NM west of Dry Tortugas out 20 NM- Straits of Florida from Ocean Reef to Craig Key 20 to 60 NM out- Straits of Florida from Craig Key to west end of Seven Mile Bridge 20 to 60 NM out- Straits of Florida from west end of Seven Mile Bridge to south of Halfmoon Shoal 20 to 60 NM out- Straits of Florida from Halfmoon Shoal to 20 NM west of Dry Tortugas 20 to 60 NM out- 1018 AM EST Wed Jan 21 2026 SMALL CRAFT ADVISORY IN EFFECT THIS AFTERNOON Northeast to east winds 20 to 25 knots, decreasing to near 20 knots. Seas 6 to 9 feet, occasionally to 11 feet. Wave Detail: Northeast to east 9 feet at 8 seconds. Isolated showers. TONIGHT Northeast to east winds near 20 knots, decreasing to 15 to 20 knots. Seas 6 to 8 feet, occasionally to 10 feet, subsiding to 5 to 7 feet, occasionally to 9 feet. Wave Detail: Northeast to east 8 feet at 7 seconds. Scattered showers. THURSDAY Northeast to east winds near 15 knots, decreasing to 10 to 15 knots. Seas 4 to 6 feet, occasionally to 8 feet, subsiding to 3 to 5 feet, occasionally to 6 feet. Wave Detail: Northeast to east 5 feet at 7 seconds, becoming northeast to east 4 feet at 6 seconds. Scattered showers. THURSDAY NIGHT Northeast to east winds 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Isolated showers. FRIDAY Northeast to east winds 10 to 15 knots. Seas 2 to 3 feet. Isolated showers. FRIDAY NIGHT Northeast to east winds 10 to 15 knots. Seas 2 to 3 feet. Isolated showers. SATURDAY East winds 10 to 15 knots. Seas 2 to 3 feet. Isolated showers. SATURDAY NIGHT East to southeast winds 10 to 15 knots. Seas 2 to 3 feet. SUNDAY East to southeast winds 10 to 15 knots. Seas 2 to 3 feet. Isolated showers. SUNDAY NIGHT East to southeast winds near 10 knots. Seas around 2 feet. Isolated showers. $$
GMZ052>055-072>075-220330- Straits of Florida from Ocean Reef to Craig Key out 20 NM- Straits of Florida from Craig Key to west end of Seven Mile Bridge out 20 NM- Straits of Florida from west end of Seven Mile Bridge to south of Halfmoon Shoal out 20 NM- Straits of Florida from Halfmoon Shoal to 20 NM west of Dry Tortugas out 20 NM- Straits of Florida from Ocean Reef to Craig Key 20 to 60 NM out- Straits of Florida from Craig Key to west end of Seven Mile Bridge 20 to 60 NM out- Straits of Florida from west end of Seven Mile Bridge to south of Halfmoon Shoal 20 to 60 NM out- Straits of Florida from Halfmoon Shoal to 20 NM west of Dry Tortugas 20 to 60 NM out- 1018 AM EST Wed Jan 21 2026 SMALL CRAFT ADVISORY IN EFFECT THIS AFTERNOON Northeast to east winds 20 to 25 knots, decreasing to near 20 knots. Seas 6 to 9 feet, occasionally to 11 feet. Wave Detail: Northeast to east 9 feet at 8 seconds. Isolated showers. TONIGHT Northeast to east winds near 20 knots, decreasing to 15 to 20 knots. Seas 6 to 8 feet, occasionally to 10 feet, subsiding to 5 to 7 feet, occasionally to 9 feet. Wave Detail: Northeast to east 8 feet at 7 seconds. Scattered showers. THURSDAY Northeast to east winds near 15 knots, decreasing to 10 to 15 knots. Seas 4 to 6 feet, occasionally to 8 feet, subsiding to 3 to 5 feet, occasionally to 6 feet. Wave Detail: Northeast to east 5 feet at 7 seconds, becoming northeast to east 4 feet at 6 seconds. Scattered showers. THURSDAY NIGHT Northeast to east winds 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Isolated showers. FRIDAY Northeast to east winds 10 to 15 knots. Seas 2 to 3 feet. Isolated showers. FRIDAY NIGHT Northeast to east winds 10 to 15 knots. Seas 2 to 3 feet. Isolated showers. SATURDAY East winds 10 to 15 knots. Seas 2 to 3 feet. Isolated showers. SATURDAY NIGHT East to southeast winds 10 to 15 knots. Seas 2 to 3 feet. SUNDAY East to southeast winds 10 to 15 knots. Seas 2 to 3 feet. Isolated showers. SUNDAY NIGHT East to southeast winds near 10 knots. Seas around 2 feet. Isolated showers. $$