GMZ005-192130-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
418 AM EST Thu Feb 19 2026
.SYNOPSIS...A surface high centered north of Puerto Rico will
meander in place for the next few days. The western periphery will
stretch west through Florida and into the Gulf. This will maintain
mainly gentle southeasterly breezes through Saturday morning. A
period of light and variable breezes are possible late Saturday
into early Sunday as the Keys remain in a col region. Confidence
is increasing for a strong cold front to sweep through the Keys
starting Sunday evening with fresh to strong northwest to north
breezes anticipated.
The Approximate Shoreward Edge of the Gulf Stream as of February
17...
7 NM South of Dry Tortugas Light...on Loggerhead Key.
3 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
2 NM South of Sand Key Light...off Key West.
7 NM South of Looe Key...off Big Pine Key.
11 NM Southeast of Sombrero Key Light...off Marathon.
14 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.
$$
GMZ032-035-192130- Bayside and Gulfside from Craig Key to west end of Seven Mile Bridge- Gulf of America from west end of Seven Mile Bridge to Halfmoon Shoal out to 5 Fathoms- 418 AM EST Thu Feb 19 2026 TODAY Southeast winds 5 to 10 knots, increasing to near 10 knots. Seas around 1 foot, except 1 to 2 feet west of the Marquesas Keys. Nearshore waters smooth to a light chop, becoming a light chop. TONIGHT Southeast winds near 10 knots. Seas around 1 foot, except 1 to 2 feet west of the Marquesas Keys. Nearshore waters a light chop. FRIDAY Southeast winds near 10 knots. Seas around 1 foot, except 1 to 2 feet west of the Marquesas Keys. Nearshore waters a light chop. FRIDAY NIGHT East to southeast winds near 10 knots. Seas around 1 foot, except 1 to 2 feet west of the Marquesas Keys. Nearshore waters a light chop. SATURDAY East to southeast winds 5 to 10 knots, becoming variable and decreasing to near 5 knots. Seas 1 foot or less. Nearshore waters smooth to a light chop, becoming smooth. SATURDAY NIGHT Variable winds near 5 knots. Seas 1 foot or less. Nearshore waters smooth. SUNDAY Variable winds near 5 knots, becoming west to northwest and increasing to 10 to 15 knots in the afternoon. Seas 1 foot or less, except building to 1 to 2 feet west of the Marquesas Keys. Nearshore waters smooth, becoming a light to moderate chop. Isolated showers in the afternoon. SUNDAY NIGHT Northwest winds near 15 knots, becoming north and increasing to near 25 knots. Seas 1 to 2 feet, building to 3 to 5 feet, occasionally to 6 feet. West of the Marquesas Keys, seas 2 to 3 feet, building to 5 to 6 feet, occasionally to 8 feet. Nearshore waters a moderate chop, becoming extremely rough. Isolated showers in the evening. MONDAY North winds near 25 knots, becoming northwest to north and decreasing to 20 to 25 knots. Seas 4 to 6 feet, occasionally to 8 feet, except 7 to 9 feet, occasionally to 11 feet west of the Marquesas Keys. Nearshore waters extremely rough, becoming very rough. MONDAY NIGHT Northwest to north winds 20 to 25 knots. Seas 4 to 6 feet, occasionally to 8 feet, except 7 to 9 feet, occasionally to 11 feet west of the Marquesas Keys. Nearshore waters very rough. $$
GMZ032-035-192130- Bayside and Gulfside from Craig Key to west end of Seven Mile Bridge- Gulf of America from west end of Seven Mile Bridge to Halfmoon Shoal out to 5 Fathoms- 418 AM EST Thu Feb 19 2026 TODAY Southeast winds 5 to 10 knots, increasing to near 10 knots. Seas around 1 foot, except 1 to 2 feet west of the Marquesas Keys. Nearshore waters smooth to a light chop, becoming a light chop. TONIGHT Southeast winds near 10 knots. Seas around 1 foot, except 1 to 2 feet west of the Marquesas Keys. Nearshore waters a light chop. FRIDAY Southeast winds near 10 knots. Seas around 1 foot, except 1 to 2 feet west of the Marquesas Keys. Nearshore waters a light chop. FRIDAY NIGHT East to southeast winds near 10 knots. Seas around 1 foot, except 1 to 2 feet west of the Marquesas Keys. Nearshore waters a light chop. SATURDAY East to southeast winds 5 to 10 knots, becoming variable and decreasing to near 5 knots. Seas 1 foot or less. Nearshore waters smooth to a light chop, becoming smooth. SATURDAY NIGHT Variable winds near 5 knots. Seas 1 foot or less. Nearshore waters smooth. SUNDAY Variable winds near 5 knots, becoming west to northwest and increasing to 10 to 15 knots in the afternoon. Seas 1 foot or less, except building to 1 to 2 feet west of the Marquesas Keys. Nearshore waters smooth, becoming a light to moderate chop. Isolated showers in the afternoon. SUNDAY NIGHT Northwest winds near 15 knots, becoming north and increasing to near 25 knots. Seas 1 to 2 feet, building to 3 to 5 feet, occasionally to 6 feet. West of the Marquesas Keys, seas 2 to 3 feet, building to 5 to 6 feet, occasionally to 8 feet. Nearshore waters a moderate chop, becoming extremely rough. Isolated showers in the evening. MONDAY North winds near 25 knots, becoming northwest to north and decreasing to 20 to 25 knots. Seas 4 to 6 feet, occasionally to 8 feet, except 7 to 9 feet, occasionally to 11 feet west of the Marquesas Keys. Nearshore waters extremely rough, becoming very rough. MONDAY NIGHT Northwest to north winds 20 to 25 knots. Seas 4 to 6 feet, occasionally to 8 feet, except 7 to 9 feet, occasionally to 11 feet west of the Marquesas Keys. Nearshore waters very rough. $$