Marine Weather Net

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


OVERNIGHT

NE
WINDS
25 - 30
KNOTS

MONDAY

NE
WINDS
25 - 30
KNOTS

MONDAY NIGHT

NE
WINDS
20 - 25
KNOTS

TUESDAY

ENE
WINDS
20 - 25
KNOTS

The Marine Weather Forecast In Detail:
GMZ035 Forecast Issued: 1028 PM EST Sun Mar 07 2021

SMALL CRAFT ADVISORY IN EFFECT
Overnight...Northeast Winds 25 To 30 Knots. Seas 2 To 5 Feet, Except 5 To 7 Feet West Of The Marquesas Keys. Nearshore Waters Extremely Rough.
Monday...Northeast Winds 25 To 30 Knots, Decreasing To Near 20 Knots In The Afternoon. Seas 3 To 6 Feet, Except 5 To 7 Feet West Of The Marquesas Keys. Nearshore Waters Extremely Rough, Becoming Rough.
Monday Night...Northeast Winds 20 To 25 Knots. Seas 2 To 5 Feet, Except 5 To 6 Feet West Of The Marquesas Keys. Nearshore Waters Very Rough. Isolated Showers.
Tuesday...Northeast To East Winds 20 To 25 Knots. Seas 2 To 5 Feet, Except 5 To 7 Feet West Of The Marquesas Keys. Nearshore Waters Very Rough.
Tuesday Night...Northeast To East Winds 20 To 25 Knots. Seas 2 To 5 Feet, Except 5 To 6 Feet West Of The Marquesas Keys. Nearshore Waters Very Rough. Isolated Showers.
Wednesday...Northeast To East Winds 20 To 25 Knots. Seas 2 To 4 Feet, Except 4 To 6 Feet West Of The Marquesas Keys. Nearshore Waters Very Rough.
Wednesday Night...Northeast To East Winds 20 To 25 Knots. Seas 2 To 4 Feet, Except 5 To 6 Feet West Of The Marquesas Keys. Nearshore Waters Very Rough.
Thursday...East Winds Near 20 Knots. Seas 2 To 4 Feet, Except 4 To 5 Feet West Of The Marquesas Keys. Nearshore Waters Rough.
Friday...East Winds Near 20 Knots. Seas 2 To 4 Feet, Except 4 To 5 Feet West Of The Marquesas Keys. Nearshore Waters Rough.
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Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas: GMZ005
1028 PM EST Sun Mar 7 2021

Freshening north to northeast breezes will become strong to near-gale overnight. Strong northeast to east breezes will persist Monday through Tuesday night, diminish somewhat by Thursday, then slacken more significantly into the weekend.

Gulf Stream
The Approximate Shoreward Edge of the Gulf Stream as of March 6, 2021...
- 49 NM South of Dry Tortugas Light...on Loggerhead Key.
- 41 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
- 28 NM South of Sand Key Light...off Key West.
- 19 NM South of Looe Key...off Big Pine Key.
- 23 NM South of Sombrero Key Light...off Marathon.
- 6 NM Southeast of Alligator Reef Light...off Islamorada.
- 4 NM Southeast of Molasses Reef Light...off Key Largo.
- 3 NM East of Carysfort Reef Light...off Ocean Reef.
Area Forecast Discussion
National Weather Service Key West FL
1003pm EST Sunday Mar 7 2021

Deep trough axis is now moving off the U.S. east coast, with surface high pressure centered near Delta region of Mississippi and western Tennessee. Fresh to strong and divergent northerlies were noted over the southern Florida Peninsula, with southwest- moving cloud streets heralding the shift to north-northeast winds. Speeds have been steady either side of 20 knots across the northwest Channel and Sand Key area, but have increased to 20 to 25 knots along the Middle and Upper Keys reef with oscillations from north to northeast. Both AMX and BYX 88Ds showed a stream of low-topped showers from just offshore Carysfort Reef through Elbow Cay of the Cay Sal Bank. Temperatures were near 70 with dew points in the upper 50s to near 60.

North to northeast winds will increase over the islands overnight as an airmass now falling through the mid 60s over metro south Florida passes over lower to mid 70s Florida Bay water temperatures. No appreciable shift in the low level confluence off the Upper Keys is expected, with showers remaining offshore. No changes to the public forecast is anticipated this evening.

Marine
A Small Craft Advisory is currently in effect for all of the nearshore and offshore coastal waters of the Florida Keys. Increasing strong north to northeast breezes are overspreading all Florida Keys coastal waters this evening. A prolonged period of strong NE-E breezes will persist through mid-week before diminishing somewhat toward the end of the workweek. East breezes look to more significantly slacken for the weekend.

NOAA Key West FL Office: Watches - Warnings - Advisories
FL...None. GM...Small Craft Advisory for GMZ031>035-042>044-052>055-072>075.