Hazardous marine condition(s):
Small Craft Advisory
GMZ005-211415-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1013 PM EDT Mon Apr 20 2026
.SYNOPSIS...Breezes will freshen overnight due to an approaching
frontal boundary. High pressure will build across the Eastern
Seaboard in its wake, slowly migrating into the western North
Atlantic over the next several days. Hazardous marine conditions
are expected to continue through at least Wednesday. As the high
slowly weakens, breezes will begin to slacken by Thursday. Gentle
to moderate breezes are expected for Friday and Saturday.
The Approximate Shoreward Edge of the Gulf Stream as of April 16...
16 NM South of Dry Tortugas Light...on Loggerhead Key.
12 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
22 NM South of Sand Key Light...off Key West.
30 NM South of Looe Key...off Big Pine Key.
26 NM Southeast of Sombrero Key Light...off Marathon.
20 NM Southeast of Alligator Reef Light...off Islamorada.
15 NM Southeast of Molasses Reef Light...off Key Largo.
9 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.
$$
GMZ033-034-211415- Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM out and beyond 5 fathoms- Gulf of America including Dry Tortugas and Rebecca Shoal Channel- 1013 PM EDT Mon Apr 20 2026 SMALL CRAFT ADVISORY IN EFFECT OVERNIGHT Northeast winds 15 to 20 knots, increasing to 20 to 25 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: North 4 feet at 6 seconds. A slight chance of showers and thunderstorms. TUESDAY Northeast to east winds 20 to 25 knots. Seas 5 to 7 feet, occasionally to 9 feet. Wave Detail: North to northeast 6 feet at 6 seconds. A slight chance of showers. TUESDAY NIGHT Northeast to east winds 20 to 25 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: Northeast to east 5 feet at 5 seconds. WEDNESDAY East winds near 20 knots, decreasing to 15 to 20 knots. Seas 4 to 6 feet, occasionally to 8 feet, subsiding to 3 to 4 feet, occasionally to 5 feet. WEDNESDAY NIGHT East winds 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. A slight chance of showers. THURSDAY East winds near 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. A slight chance of showers. THURSDAY NIGHT East to southeast winds 15 to 20 knots, decreasing to near 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. A slight chance of showers and thunderstorms. FRIDAY East to southeast winds 10 to 15 knots, decreasing to near 10 knots. Seas 2 to 3 feet. A slight chance of showers. FRIDAY NIGHT East winds 10 to 15 knots. Seas 2 to 3 feet. SATURDAY AND SATURDAY NIGHT East to southeast winds near 10 knots. Seas 1 to 2 feet. $$
GMZ033-034-211415- Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM out and beyond 5 fathoms- Gulf of America including Dry Tortugas and Rebecca Shoal Channel- 1013 PM EDT Mon Apr 20 2026 SMALL CRAFT ADVISORY IN EFFECT OVERNIGHT Northeast winds 15 to 20 knots, increasing to 20 to 25 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: North 4 feet at 6 seconds. A slight chance of showers and thunderstorms. TUESDAY Northeast to east winds 20 to 25 knots. Seas 5 to 7 feet, occasionally to 9 feet. Wave Detail: North to northeast 6 feet at 6 seconds. A slight chance of showers. TUESDAY NIGHT Northeast to east winds 20 to 25 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: Northeast to east 5 feet at 5 seconds. WEDNESDAY East winds near 20 knots, decreasing to 15 to 20 knots. Seas 4 to 6 feet, occasionally to 8 feet, subsiding to 3 to 4 feet, occasionally to 5 feet. WEDNESDAY NIGHT East winds 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. A slight chance of showers. THURSDAY East winds near 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. A slight chance of showers. THURSDAY NIGHT East to southeast winds 15 to 20 knots, decreasing to near 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. A slight chance of showers and thunderstorms. FRIDAY East to southeast winds 10 to 15 knots, decreasing to near 10 knots. Seas 2 to 3 feet. A slight chance of showers. FRIDAY NIGHT East winds 10 to 15 knots. Seas 2 to 3 feet. SATURDAY AND SATURDAY NIGHT East to southeast winds near 10 knots. Seas 1 to 2 feet. $$