Hazardous marine condition(s):
Small Craft Advisory
GMZ005-200830-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
437 PM EDT Thu Mar 19 2026
.SYNOPSIS...Elongated high pressure over the Eastern Seaboard
interacting with a decaying frontal boundary in the Caribbean
will maintain fresh to occasionally strong breezes tonight.
Breezes will slacken appreciably beginning Friday afternoon, with
light to gentle breezes expected for the weekend into early next
week.
The Approximate Shoreward Edge of the Gulf Stream as of March 16...
36 NM South of Dry Tortugas Light...on Loggerhead Key.
49 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
31 NM South of Sand Key Light...off Key West.
16 NM South of Looe Key...off Big Pine Key.
14 NM Southeast of Sombrero Key Light...off Marathon.
7 NM Southeast of Alligator Reef Light...off Islamorada.
4 NM Southeast of Molasses Reef Light...off Key Largo.
6 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.
$$
GMZ042>044-200830- Hawk Channel from Ocean Reef to Craig Key out to the reef- Hawk Channel from Craig Key to west end of Seven Mile Bridge out to the reef- Hawk Channel from west end of Seven Mile Bridge to Halfmoon Shoal out to the reef- 437 PM EDT Thu Mar 19 2026 SMALL CRAFT ADVISORY IN EFFECT TONIGHT North to northeast winds near 20 knots. Seas 2 to 4 feet, occasionally to 5 feet, except 4 to 5 feet, occasionally to 6 feet west of Cosgrove Shoal Light. Nearshore waters rough. A slight chance of showers. FRIDAY North to northeast winds near 20 knots, decreasing to 15 to 20 knots. Seas subsiding to 2 to 3 feet, except subsiding to 3 to 4 feet, occasionally to 5 feet west of Cosgrove Shoal Light. Nearshore waters rough, becoming choppy. A slight chance of showers. FRIDAY NIGHT Northeast winds 15 to 20 knots. Seas 2 to 3 feet, except 3 to 4 feet, occasionally to 5 feet west of Cosgrove Shoal Light. Nearshore waters choppy. SATURDAY Northeast winds near 15 knots, decreasing to 10 to 15 knots. Seas 2 to 3 feet. Nearshore waters a moderate chop, becoming a light to moderate chop. SATURDAY NIGHT Northeast to east winds near 10 knots. Seas around 2 feet, subsiding to 1 to 2 feet. Nearshore waters a light chop. SUNDAY East winds 5 to 10 knots. Seas 1 to 2 feet. Nearshore waters smooth to a light chop. SUNDAY NIGHT East winds near 10 knots. Seas 1 to 2 feet. Nearshore waters a light chop. MONDAY Northeast to east winds 5 to 10 knots. Seas 1 to 2 feet. Nearshore waters smooth to a light chop. MONDAY NIGHT Northeast to east winds 5 to 10 knots, increasing to near 10 knots. Seas 1 to 2 feet. Nearshore waters smooth to a light chop, becoming a light chop. TUESDAY Northeast winds near 10 knots, decreasing to 5 to 10 knots. Seas 1 to 2 feet. Nearshore waters a light chop, becoming smooth to a light chop. TUESDAY NIGHT Northeast winds 5 to 10 knots, increasing to near 10 knots. Seas 1 to 2 feet. Nearshore waters smooth to a light chop, becoming a light chop. $$
GMZ042>044-200830- 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- 437 PM EDT Thu Mar 19 2026 SMALL CRAFT ADVISORY IN EFFECT TONIGHT North to northeast winds near 20 knots. Seas 2 to 4 feet, occasionally to 5 feet, except 4 to 5 feet, occasionally to 6 feet west of Cosgrove Shoal Light. Nearshore waters rough. A slight chance of showers. FRIDAY North to northeast winds near 20 knots, decreasing to 15 to 20 knots. Seas subsiding to 2 to 3 feet, except subsiding to 3 to 4 feet, occasionally to 5 feet west of Cosgrove Shoal Light. Nearshore waters rough, becoming choppy. A slight chance of showers. FRIDAY NIGHT Northeast winds 15 to 20 knots. Seas 2 to 3 feet, except 3 to 4 feet, occasionally to 5 feet west of Cosgrove Shoal Light. Nearshore waters choppy. SATURDAY Northeast winds near 15 knots, decreasing to 10 to 15 knots. Seas 2 to 3 feet. Nearshore waters a moderate chop, becoming a light to moderate chop. SATURDAY NIGHT Northeast to east winds near 10 knots. Seas around 2 feet, subsiding to 1 to 2 feet. Nearshore waters a light chop. SUNDAY East winds 5 to 10 knots. Seas 1 to 2 feet. Nearshore waters smooth to a light chop. SUNDAY NIGHT East winds near 10 knots. Seas 1 to 2 feet. Nearshore waters a light chop. MONDAY Northeast to east winds 5 to 10 knots. Seas 1 to 2 feet. Nearshore waters smooth to a light chop. MONDAY NIGHT Northeast to east winds 5 to 10 knots, increasing to near 10 knots. Seas 1 to 2 feet. Nearshore waters smooth to a light chop, becoming a light chop. TUESDAY Northeast winds near 10 knots, decreasing to 5 to 10 knots. Seas 1 to 2 feet. Nearshore waters a light chop, becoming smooth to a light chop. TUESDAY NIGHT Northeast winds 5 to 10 knots, increasing to near 10 knots. Seas 1 to 2 feet. Nearshore waters smooth to a light chop, becoming a light chop. $$