Marine Weather Net

Hawk Channel from Seven Mile Bridge to Halfmoon Shoal out to the reef Marine Forecast


THIS AFTERNOON

NNE
WINDS
10 - 15
KNOTS

TONIGHT

NNE
WINDS
15 - 20
KNOTS

TUESDAY

NE
WINDS
20
KNOTS

TUESDAY NIGHT

ENE
WINDS
15 - 20
KNOTS

The Marine Weather Forecast In Detail:
GMZ044 Forecast Issued: 1040 AM EST Mon Nov 03 2025

SMALL CRAFT SHOULD EXERCISE CAUTION FOR INCREASING WINDS ...SMALL CRAFT ADVISORY LIKELY WILL BE REQUIRED TONIGHT...
This Afternoon...North To Northeast Winds 10 To 15 Knots, Increasing To 15 To 20 Knots. Seas 1 To 2 Feet, Except Building To 2 To 3 Feet West Of Cosgrove Shoal Light. Nearshore Waters A Light To Moderate Chop, Becoming Choppy. Isolated Showers.
Tonight...North To Northeast Winds 15 To 20 Knots, Increasing To Near 20 Knots. Seas 2 To 3 Feet, Except 3 To 4 Feet, Occasionally To 5 Feet West Of Cosgrove Shoal Light. Nearshore Waters Choppy, Becoming Rough. Isolated Showers.
Tuesday...Northeast Winds Near 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 Rough. Isolated Showers.
Tuesday Night...Northeast To East Winds 15 To 20 Knots. Seas 2 To 4 Feet, Occasionally To 5 Feet, Except 3 To 5 Feet, Occasionally To 6 Feet West Of Cosgrove Shoal Light. Nearshore Waters Choppy. Isolated Showers.
Wednesday...Northeast To East Winds 15 To 20 Knots, Decreasing To Near 15 Knots. Seas 2 To 4 Feet, Occasionally To 5 Feet, Subsiding To 2 To 3 Feet. Nearshore Waters Choppy, Becoming A Moderate Chop. Isolated Showers.
Wednesday Night...Northeast To East Winds Near 15 Knots, Decreasing To 10 To 15 Knots. Seas 2 To 3 Feet. Nearshore Waters A Moderate Chop, Becoming A Light To Moderate Chop. Isolated Showers.
Thursday...Northeast To East Winds 10 To 15 Knots. Seas Around 2 Feet. Nearshore Waters A Light To Moderate Chop. Isolated Showers.
Thursday Night...East Winds Near 15 Knots. Seas 2 To 3 Feet. Nearshore Waters A Moderate Chop. Scattered Showers.
Friday...East Winds 10 To 15 Knots, Decreasing To Near 10 Knots. Seas Around 2 Feet. Nearshore Waters A Light To Moderate Chop, Becoming A Light Chop. Scattered Showers.
Friday Night...East Winds 5 To 10 Knots. Seas 1 To 2 Feet. Nearshore Waters Smooth To A Light Chop. Scattered Showers.
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Area Forecast Discussion
National Weather Service Key West FL
341pm EST Monday Nov 3 2025

Issued at 423am EST Monday Nov 3 2025 It has been a fairly quiet overnight across the Florida Keys. KBYX radar shows any remaining rain that was over the eastern Straits earlier in the night has moved off to the east. There were also some showers being detected to the west of the Straits of Florida over the southern Gulf waters. GOES East Nighttime Microphysics imagery shows mostly clear skies across the Keys as well as most of the cloud cover has also moved east out of the Keys coverage area. This has led to a comfortable night along the Island Chain. Temperatures are in the lower 70s with dew points near 70 degrees. The Keys remain in a col region for now with all significant weather systems remaining either east of the area or northwest of the region. This is resulting in marine platforms observing mainly light north to northeast breezes.

.FORECAST... The main story going forward will be an approaching cold front later today. This front is connected to a developing area of low pressure off the North Carolina coastline. The front is draped south-southwestward through the central Florida Peninsula and into the central Gulf. As the aforementioned low pressure area continues to strengthen and move northeastward, a strong surface high pressure will build in behind it which will help to push the front southeastward towards the Keys. We expect frontal passage sometime this afternoon into this evening. This will result in freshening breezes initially across the western waters this afternoon and then across the entire area tonight. Therefore, expect another period of breezy conditions out of the north to northeast tonight. The surface high will traverse across the Southeast U.S. tonight through Wednesday before emerging into the western North Atlantic. As it does so the high will flatten and weaken as it continues moving eastward farther out to sea mid to late week. This will keep breezy conditions initially through Tuesday night with slackening breezes thereafter. Slight rain chances are anticipated today and tonight as the front presses through before the deeper dry air moves in.

Mid to late week will see moisture starting to return, resulting in increasing rain chances. The period starts out with slight chances across the Island Chain as most of the moisture will initially be pooling north of Cuba and across the southern Straits of Florida. However, as the week progresses, we expect this moisture to continue bleeding northward as well as becoming deeper through the column. This will result in chances of rain for late week into the weekend.

Marine
Issued at 423am EST Monday Nov 3 2025 Small Craft Should Exercise Caution (SCEC) for increasing winds this afternoon is headlined for the nearshore waters surrounding the Lower Keys, the offshore Gulf waters, and the western Straits of Florida. In addition, Small Craft Advisory likely will be required tonight is headlined for the offshore Gulf waters, all the Florida Straits all of Hawk Channel, as well as the nearshore waters north of the Lower Keys. Meanwhile, a Small Craft Advisory may be required tonight is headlined for the nearshore and bay waters north of the Middle and Upper Keys. From synopsis, north to northeast breezes are expected to freshen today as a cold front approaches and then surges through the area. In the wake of the front, strong surface high pressure slowly migrates eastward across the Southeast U.S. which will maintain moderate to fresh breezes. Thereafter, breezes slacken as the ridge moves further out into the Atlantic and weakens.

NOAA Key West FL Office: Watches - Warnings - Advisories
FL...None. GM...Small Craft Advisory GMZ033>035-042-043-052-053-072-073.