Hazardous marine condition(s):
Short Term Forecast
Small Craft Advisory
GMZ005-160930-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
426 PM EST Mon Dec 15 2025
.SYNOPSIS...The pressure gradient will remain tightened in the
wake of the recent cold front passage and will maintain an
extended period of fresh to strong breezes. Higher pressure
building in during the middle of the week will cause breezes to
slacken for the second half of the week. A weaker front looks to
move through by the end of the week with potentially freshening
breezes for the weekend.
The Approximate Shoreward Edge of the Gulf Stream as of December 15...
26 NM South of Dry Tortugas Light...on Loggerhead Key.
21 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
15 NM South of Sand Key Light...off Key West.
18 NM South of Looe Key...off Big Pine Key.
16 NM Southeast of Sombrero Key Light...off Marathon.
13 NM Southeast of Alligator Reef Light...off Islamorada.
7 NM Southeast of Molasses Reef Light...off Key Largo.
3 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>044-160930- 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- 426 PM EST Mon Dec 15 2025 SMALL CRAFT ADVISORY IN EFFECT TONIGHT Northeast winds 20 to 25 knots. Seas 3 to 5 feet, occasionally to 6 feet, except 5 to 6 feet, occasionally to 8 feet west of Cosgrove Shoal Light. Nearshore waters very rough. Scattered showers. TUESDAY 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. TUESDAY NIGHT Northeast to east winds near 20 knots, decreasing to 15 to 20 knots after midnight. Seas 3 to 5 feet, occasionally to 6 feet. Nearshore waters rough, becoming choppy. Isolated showers. WEDNESDAY East winds 15 to 20 knots, decreasing to near 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Nearshore waters choppy, becoming a moderate chop. Isolated showers. WEDNESDAY NIGHT East winds 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Nearshore waters a light to moderate chop. Isolated showers. THURSDAY East to southeast winds decreasing to near 10 knots. Seas 2 to 3 feet. Nearshore waters becoming a light chop. Isolated showers. THURSDAY NIGHT East to southeast winds near 10 knots, becoming southeast to south 5 to 10 knots. Seas 2 to 3 feet, subsiding to 1 to 2 feet. Nearshore waters a light chop, becoming smooth to a light chop. Isolated showers. FRIDAY Southwest to west winds 5 to 10 knots, becoming northwest to north near 10 knots. Seas around 1 foot, except building to 1 to 2 feet west of Cosgrove Shoal Light. Nearshore waters smooth to a light chop, becoming a light chop. Isolated showers. FRIDAY NIGHT Northwest to north winds near 10 knots, becoming north to northeast 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a light chop, becoming a light to moderate chop. Isolated showers. SATURDAY Northeast to east winds 10 to 15 knots. Seas 2 to 3 feet. Nearshore waters a light to moderate chop. Isolated showers. SATURDAY NIGHT East winds 10 to 15 knots. Seas 2 to 3 feet. Nearshore waters a light to moderate chop. Isolated showers. $$
GMZ042>044-160930- 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- 426 PM EST Mon Dec 15 2025 SMALL CRAFT ADVISORY IN EFFECT TONIGHT Northeast winds 20 to 25 knots. Seas 3 to 5 feet, occasionally to 6 feet, except 5 to 6 feet, occasionally to 8 feet west of Cosgrove Shoal Light. Nearshore waters very rough. Scattered showers. TUESDAY 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. TUESDAY NIGHT Northeast to east winds near 20 knots, decreasing to 15 to 20 knots after midnight. Seas 3 to 5 feet, occasionally to 6 feet. Nearshore waters rough, becoming choppy. Isolated showers. WEDNESDAY East winds 15 to 20 knots, decreasing to near 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Nearshore waters choppy, becoming a moderate chop. Isolated showers. WEDNESDAY NIGHT East winds 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Nearshore waters a light to moderate chop. Isolated showers. THURSDAY East to southeast winds decreasing to near 10 knots. Seas 2 to 3 feet. Nearshore waters becoming a light chop. Isolated showers. THURSDAY NIGHT East to southeast winds near 10 knots, becoming southeast to south 5 to 10 knots. Seas 2 to 3 feet, subsiding to 1 to 2 feet. Nearshore waters a light chop, becoming smooth to a light chop. Isolated showers. FRIDAY Southwest to west winds 5 to 10 knots, becoming northwest to north near 10 knots. Seas around 1 foot, except building to 1 to 2 feet west of Cosgrove Shoal Light. Nearshore waters smooth to a light chop, becoming a light chop. Isolated showers. FRIDAY NIGHT Northwest to north winds near 10 knots, becoming north to northeast 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a light chop, becoming a light to moderate chop. Isolated showers. SATURDAY Northeast to east winds 10 to 15 knots. Seas 2 to 3 feet. Nearshore waters a light to moderate chop. Isolated showers. SATURDAY NIGHT East winds 10 to 15 knots. Seas 2 to 3 feet. Nearshore waters a light to moderate chop. Isolated showers. $$