GMZ005-210830-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1020 PM EDT Thu Mar 20 2025
.SYNOPSIS...A cold front will continue to sweep through the
Florida Keys marine zones from west to east overnight. As it
passes through our waters, northwest to north breezes will freshen
in its wake through Friday morning. Behind the front, an area of
high pressure will settle over the Southeast, with breezes
slackening for Friday afternoon through the weekend. The high will
then slide southeastward into the Atlantic, allowing for winds to
briefly clock around to the east to southeast. There is the
potential for a back door front to slide through the region
towards the middle of next week.
The Approximate Shoreward Edge of the Gulf Stream as of March 15...
14 NM South of Dry Tortugas Light...on Loggerhead Key.
3 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
1 NM South of Sand Key Light...off Key West.
4 NM South of Looe Key...off Big Pine Key.
5 NM South of Sombrero Key Light...off Marathon.
5 NM Southeast of Alligator Reef Light...off Islamorada.
4 NM Southeast of Molasses Reef Light...off Key Largo.
2 NM East of Carysfort Reef Light...off Ocean Reef.
Gulf Stream Information Courtesy of the National Weather Service in Key
West based on products from the Real Time Ocean Forecast System and
NASA SPoRT.
$$
GMZ042>044-210830-
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-
1020 PM EDT Thu Mar 20 2025
SMALL CRAFT ADVISORY IN EFFECT
OVERNIGHT
West winds 10 to 15 knots, becoming northwest 20 to
25 knots. Seas 1 to 2 feet, building to 2 to 3 feet, except
building to 3 to 5 feet, occasionally to 6 feet west of Cosgrove
Shoal Light. Nearshore waters a light to moderate chop, becoming
very rough. Areas of smoke off the Upper Keys late.
FRIDAY
North to northeast winds near 20 knots, decreasing to
10 to 15 knots in the afternoon. Seas 2 to 3 feet, except 4 to 6
feet, occasionally to 8 feet west of Cosgrove Shoal Light.
Nearshore waters rough, becoming a light to moderate chop. Areas
of smoke off the Upper Keys.
FRIDAY NIGHT
Northeast winds near 10 knots. Seas 1 to 2 feet.
West of Cosgrove Shoal Light, seas 3 to 5 feet, occasionally to 6
feet, subsiding to 3 to 4 feet, occasionally to 5 feet. Nearshore
waters a light chop.
SATURDAY
Northeast to east winds near 10 knots. Seas 1 to
2 feet, except 2 to 3 feet west of Cosgrove Shoal Light.
Nearshore waters a light chop.
SATURDAY NIGHT
Northeast to east winds 10 to 15 knots. Seas
1 to 2 feet, except 2 to 3 feet west of Cosgrove Shoal Light.
Nearshore waters a light to moderate chop.
SUNDAY
East winds near 15 knots. Seas 2 to 3 feet. Nearshore
waters a moderate chop.
SUNDAY NIGHT
East to southeast winds near 15 knots. Seas 2 to
3 feet. Nearshore waters a moderate chop.
MONDAY
Southeast winds near 15 knots, becoming east to
southeast 10 to 15 knots. Seas 2 to 3 feet. Nearshore waters a
moderate chop, becoming a light to moderate chop.
MONDAY NIGHT
East to southeast winds near 10 knots. Seas
subsiding to 1 to 2 feet. Nearshore waters a light chop. Isolated
showers.
TUESDAY
East winds near 10 knots, becoming northeast in the
afternoon. Seas 1 to 2 feet. Nearshore waters a light chop.
Isolated showers.
TUESDAY NIGHT
North to northeast winds 10 to 15 knots. Seas
1 to 3 feet. Nearshore waters a light to moderate chop. Isolated
showers.
$$
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