Marine Weather Net

Gulf of Mexico from Seven Mile Bridge to Halfmoon Shoal Marine Forecast


OVERNIGHT

NE
WINDS
20
KNOTS

THURSDAY

E
WINDS
15 - 20
KNOTS

THURSDAY NIGHT

E
WINDS
15
KNOTS

FRIDAY

E
WINDS
10 - 15
KNOTS

The Marine Weather Forecast In Detail:
GMZ035 Forecast Issued: 1003 PM EST Wed Dec 02 2020

SMALL CRAFT ADVISORY IN EFFECT
Overnight...Northeast Winds Near 20 Knots. Seas 2 To 4 Feet, Except 4 To 5 Feet West Of The Marquesas Keys. Nearshore Waters Choppy.
Thursday...Northeast To East Winds 15 To 20 Knots. Seas 1 To 3 Feet, Except 3 To 5 Feet West Of The Marquesas Keys. Nearshore Waters Choppy.
Thursday Night...East Winds Near 15 Knots. Seas 1 To 3 Feet. Nearshore Waters A Moderate Chop. Isolated Showers.
Friday...East Winds 10 To 15 Knots. Seas 1 To 2 Feet. Nearshore Waters A Light To Moderate Chop. Isolated Showers.
Friday Night...East To Southeast Winds Near 10 Knots Becoming South Early In The Morning. Seas 1 To 2 Feet. Nearshore Waters A Light Chop. Scattered Showers.
Saturday...South To Southwest Winds 5 To 10 Knots Becoming West To Northwest In The Afternoon. Seas 1 To 2 Feet. Nearshore Waters Smooth To A Light Chop. Scattered Showers.
Saturday Night...Northwest To North Winds 10 To 15 Knots. Seas 2 To 4 Feet. Nearshore Waters A Light To Moderate Chop. Isolated Showers.
Sunday...North To Northeast Winds 10 To 15 Knots. Seas 1 To 3 Feet. Nearshore Waters A Light To Moderate Chop. Isolated Showers.
Sunday Night...North Winds 10 To 15 Knots. Seas 1 To 3 Feet. Nearshore Waters A Light To Moderate Chop. Isolated Showers.
Monday...Northwest To North Winds 10 To 15 Knots. Seas 1 To 3 Feet. Nearshore Waters A Light To Moderate Chop. Isolated Showers.
Monday Night...Northwest To North Winds Increasing To 15 To 20 Knots. Seas 1 To 3 Feet, Except Building To 2 To 4 Feet West Of The Marquesas Keys. Nearshore Waters Becoming Choppy. Isolated Showers.
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Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas: GMZ005
1003 PM EST Wed Dec 2 2020

Fresh to strong northeast to east breezes will continue overnight across the Keys coastal waters. East breezes will gradually diminish Thursday into Friday before the next cold front approaches the Keys this weekend, likely moving through the coastal waters Saturday or Saturday night. Yet another front will approach the Florida Keys late Monday or early Tuesday.

Gulf Stream
The Approximate Shoreward Edge of the Gulf Stream as of December 2...
- 6 NM South of Dry Tortugas Light...on Loggerhead Key.
- 1 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
- 1 NM South of Sand Key Light...off Key West.
- 1 NM South of Looe Key...off Big Pine Key. Less than
- 1 NM South of Sombrero Key Light...off Marathon. Less than
- 1 NM Southeast of Alligator Reef Light...off Islamorada.
- 1 NM Southeast of Molasses Reef Light...off Key Largo.
Area Forecast Discussion
National Weather Service Key West FL
948pm EST Wednesday Dec 2 2020

Mostly clear and relatively cool conditions prevail across the Keys on this Wednesday evening. Radar detects no shower activity across the area, although a small area of mid level cloudiness moving eastward from the Dry Tortugas toward the Lower Keys has generated some weak radar returns at times. Temperatures along the island chain are hovering in the upper 60s, with the airmass having modified during the past 24 hours, and low level winds having veered toward the ENE with more of a marine trajectory. Dewpoints in the upper 50s are providing another very comfortable evening.

The 00Z Key West sounding found an inversion based near 2800 feet, and a very dry airmass remaining in place with PW of only 0.65 inches. The airmass is especially dry in the 900-750 mb layer, where dewpoint depressions of up to 50C were measured. This dry and stable airmass will remain firmly in control across our area overnight, with the dry low levels preventing any possible light shower activity from the patches of mid level moisture moving overhead. The current forecast is on track, and no updates are planned for this evening.

Marine
Evening observations show NE winds running near 20 knots across much of the Keys coastal waters, up to 25 knots at times at Sand Key. Will maintain the existing Small Craft Advisory for all Keys waters except for Florida Bay, where a Small Craft Exercise Caution will remain posted.

NOAA Key West FL Office: Watches - Warnings - Advisories
FL...None. GM...Small Craft Advisory for GMZ032>035-042>044-052>055-072>075.