GMZ005-131545-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1042 PM EST Fri Dec 12 2025
.SYNOPSIS...High pressure drifting eastward into the western
North Atlantic will result in gentle to moderate, occasionally
fresh, northeast to east breezes overnight. 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 Saturday 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.
$$
GMZ034-131545-
Gulf of America including Dry Tortugas and Rebecca Shoal Channel-
1042 PM EST Fri Dec 12 2025
SMALL CRAFT SHOULD EXERCISE CAUTION
OVERNIGHT
East winds 15 to 20 knots. Seas 2 to 4 feet. Wave
Detail: East 2 feet at 3 seconds and northwest 2 feet at 6
seconds. Isolated showers.
SATURDAY
Northeast to east winds near 15 knots. Seas 2 to 4
feet. Wave Detail: Northeast to east 2 feet at 4 seconds and
northwest 1 foot at 5 seconds. Isolated showers. Isolated showers
and thunderstorms in the afternoon.
SATURDAY NIGHT
East winds 10 to 15 knots, decreasing to 5 to
10 knots after midnight. Seas subsiding to 1 to 2 feet. Wave
Detail: East 2 feet at 4 seconds. Numerous showers and scattered
thunderstorms.
SUNDAY
North to northeast winds 5 to 10 knots, increasing to 10
to 15 knots. Seas 1 to 2 feet, building to 2 to 3 feet. Scattered
showers and isolated thunderstorms.
SUNDAY NIGHT
North to northeast winds 15 to 20 knots. Seas
building to 3 to 5 feet, occasionally to 6 feet. Isolated
showers.
MONDAY
Northeast winds near 20 knots. Seas 4 to 6 feet,
occasionally to 8 feet. Isolated showers.
MONDAY NIGHT
Northeast winds near 20 knots. Seas 4 to 6 feet,
occasionally to 8 feet. Isolated showers.
TUESDAY
Northeast to east winds near to 20 knots, decreasing to 15
to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Isolated
showers.
TUESDAY NIGHT
Northeast to east winds 15 to 20 knots. Seas
2 to 4 feet, occasionally to 5 feet. Isolated showers.
WEDNESDAY AND WEDNESDAY NIGHT
East winds near 15 knots. Seas 2
to 3 feet. Isolated showers.
$$
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