GMZ005-132145-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
431 AM EST Sat Dec 13 2025
.SYNOPSIS...Moderate to occasionally fresh northeast to easterly
breezes will slightly slacken over the day into tonight. The next
frontal boundary is progged to push through the Florida Keys
marine zones on Sunday night. Ahead of the front, elevated chances
for showers and thunderstorms will be possible late tonight
through early Sunday. In the wake of the frontal passage, fresh to
strong northeasterly breezes are expected Sunday night through at
least Tuesday.
The Approximate Shoreward Edge of the Gulf Stream as of December 8...
15 NM South of Dry Tortugas Light...on Loggerhead Key.
13 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
14 NM South of Sand Key Light...off Key West.
18 NM South of Looe Key...off Big Pine Key.
23 NM Southeast of Sombrero Key Light...off Marathon.
18 NM Southeast of Alligator Reef Light...off Islamorada.
12 NM Southeast of Molasses Reef Light...off Key Largo.
8 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>044-132145-
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-
431 AM EST Sat Dec 13 2025
.SMALL CRAFT SHOULD EXERCISE CAUTION UNTIL WINDS DECREASE...
TODAY
Northeast to east winds 15 to 20 knots, decreasing to
near 15 knots. Seas 2 to 3 feet. Nearshore waters choppy, becoming
a moderate chop. Scattered showers and isolated thunderstorms in
the afternoon.
TONIGHT
East winds 10 to 15 knots, decreasing to near 10 knots.
Seas 1 to 2 feet. Nearshore waters a light to moderate chop,
becoming a light chop. Widespread showers and scattered
thunderstorms.
SUNDAY
North winds 5 to 10 knots, increasing to 10 to 15 knots.
Seas 1 to 2 feet. Nearshore waters smooth to a light chop,
becoming a light to moderate chop. Scattered showers and isolated
thunderstorms.
SUNDAY NIGHT
North winds 15 to 20 knots, increasing to near 20
knots. Seas 1 to 2 feet, building to 2 to 4 feet, occasionally to
5 feet after midnight. Nearshore waters choppy, becoming rough.
Isolated showers.
MONDAY
Northeast winds near 20 knots. Seas 2 to 4 feet,
occasionally to 5 feet, except 4 to 6 feet, occasionally to 8
feet west of Cosgrove Shoal Light. Nearshore waters rough.
Isolated showers.
MONDAY NIGHT
Northeast winds near 20 knots. Seas 3 to 5 feet,
occasionally to 6 feet, except 4 to 6 feet, occasionally to 8 feet
west of Cosgrove Shoal Light. Nearshore waters rough. Isolated
showers.
TUESDAY
Northeast winds 15 to 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 choppy. Isolated
showers.
TUESDAY NIGHT
Northeast to east winds 15 to 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 choppy.
Isolated showers.
WEDNESDAY AND WEDNESDAY NIGHT
East winds near 15 knots. Seas 2
to 3 feet. Nearshore waters a moderate chop. Isolated showers.
$$
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