Hazardous marine condition(s):
Short Term Forecast
GMZ005-222130-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
418 AM EST Thu Jan 22 2026
.SYNOPSIS...Gentle to moderate northeasterlies will persist across
the nearshore and offshore waters through the end of the work
week. Shower coverage will diminish today and tonight as winds
aloft direct a plume of moisture away from the Keys. Over the
weekend, breezes are expected to slacken to light to gentle. A
strong winter storm developing over the southeastern United States
is responsible for weakening the pressure gradient, and a cold
frontal passage associated with this system is expected sometime
Monday to Monday Night. Winds will rapidly clock north and freshen
to fresh to strong in its wake.
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.
$$
GMZ032-035-222130- Bayside and Gulfside from Craig Key to west end of Seven Mile Bridge- Gulf of America from west end of Seven Mile Bridge to Halfmoon Shoal out to 5 Fathoms- 418 AM EST Thu Jan 22 2026 TODAY Northeast winds 10 to 15 knots, decreasing to 5 to 10 knots. Seas 1 to 2 feet, except 2 to 3 feet west of the Marquesas Keys. Nearshore waters a light to moderate chop, becoming smooth to a light chop. Isolated showers. TONIGHT Northeast winds 5 to 10 knots. Seas around 1 foot. Nearshore waters smooth to a light chop. Isolated showers. FRIDAY Northeast to east winds 5 to 10 knots. Seas 1 foot or less. Nearshore waters smooth to a light chop. Isolated showers. FRIDAY NIGHT Northeast to east winds near 10 knots. Seas around 1 foot. Nearshore waters a light chop. Isolated showers. SATURDAY Northeast to east winds near 10 knots. Seas 1 to 2 feet. Nearshore waters a light chop. SATURDAY NIGHT East winds 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate chop. SUNDAY East to southeast winds near 10 knots. Seas 1 to 2 feet. Nearshore waters a light chop. SUNDAY NIGHT Southeast winds 5 to 10 knots, becoming south. Seas around 1 foot. Nearshore waters smooth to a light chop. Isolated showers. MONDAY Southwest to west winds 5 to 10 knots, becoming northwest to north 15 to 20 knots. Seas building to 1 to 2 feet. Nearshore waters smooth to a light chop, becoming choppy. Isolated showers. MONDAY NIGHT North winds near 20 knots, increasing to 20 to 25 knots. Seas building to 3 to 5 feet, occasionally to 6 feet. West of the Marquesas Keys, seas building to 4 to 7 feet, occasionally to 9 feet. Nearshore waters rough, becoming very rough. Isolated showers. $$
GMZ032-035-222130- 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 Jan 22 2026 TODAY Northeast winds 10 to 15 knots, decreasing to 5 to 10 knots. Seas 1 to 2 feet, except 2 to 3 feet west of the Marquesas Keys. Nearshore waters a light to moderate chop, becoming smooth to a light chop. Isolated showers. TONIGHT Northeast winds 5 to 10 knots. Seas around 1 foot. Nearshore waters smooth to a light chop. Isolated showers. FRIDAY Northeast to east winds 5 to 10 knots. Seas 1 foot or less. Nearshore waters smooth to a light chop. Isolated showers. FRIDAY NIGHT Northeast to east winds near 10 knots. Seas around 1 foot. Nearshore waters a light chop. Isolated showers. SATURDAY Northeast to east winds near 10 knots. Seas 1 to 2 feet. Nearshore waters a light chop. SATURDAY NIGHT East winds 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate chop. SUNDAY East to southeast winds near 10 knots. Seas 1 to 2 feet. Nearshore waters a light chop. SUNDAY NIGHT Southeast winds 5 to 10 knots, becoming south. Seas around 1 foot. Nearshore waters smooth to a light chop. Isolated showers. MONDAY Southwest to west winds 5 to 10 knots, becoming northwest to north 15 to 20 knots. Seas building to 1 to 2 feet. Nearshore waters smooth to a light chop, becoming choppy. Isolated showers. MONDAY NIGHT North winds near 20 knots, increasing to 20 to 25 knots. Seas building to 3 to 5 feet, occasionally to 6 feet. West of the Marquesas Keys, seas building to 4 to 7 feet, occasionally to 9 feet. Nearshore waters rough, becoming very rough. Isolated showers. $$