Marine Weather Net

Straits of Florida from Craig Key to West End of Seven Mile Bridge Out 20 NM Marine Forecast


OVERNIGHT

NE
WINDS
15
KNOTS

THURSDAY

ENE
WINDS
10 - 15
KNOTS

THURSDAY NIGHT

SE
WINDS
10
KNOTS

FRIDAY

SSE
WINDS
10
KNOTS

The Marine Weather Forecast In Detail:
GMZ053 Forecast Issued: 1031 PM EST Wed Jan 20 2021

Overnight...Northeast Winds Near 15 Knots. Seas 3 To 5 Feet, Subsiding To 3 To 4 Feet.
Thursday...Northeast To East Winds 10 To 15 Knots. Seas 2 To 4 Feet.
Thursday Night...East To Southeast Winds Decreasing To Near 10 Knots. Seas Subsiding To 2 To 3 Feet.
Friday...Southeast To South Winds Near 10 Knots, Becoming Southwest And Decreasing To 5 To 10 Knots. Seas 1 To 3 Feet, Subsiding To 1 To 2 Feet.
Friday Night...Mainly North Winds Near 5 Knots. Seas Around 1 Foot.
Saturday...North To Northeast Winds 5 To 10 Knots. Seas 1 To 2 Feet.
Saturday Night...Northeast To East Winds Increasing To 10 To 15 Knots. Seas Building To 2 To 3 Feet.
Sunday...East Winds 10 To 15 Knots. Seas 2 To 4 Feet. Isolated Showers.
Sunday Night...East To Southeast Winds Increasing To Near 15 Knots. Seas Building To 3 To 5 Feet.
Monday...Southeast Winds 15 To 20 Knots. Seas 4 To 5 Feet.
Monday Night...Southeast To South Winds Decreasing To 10 To 15 Knots. Seas 3 To 5 Feet, Subsiding To 2 To 4 Feet.
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Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas: GMZ005
1031 PM EST Wed Jan 20 2021

Moderate breezes are expected for the coastal waters of the Florida Keys overnight. A ridge of high pressure will continue to push southward through Florida Thursday and Thursday night. As the ridge axis approaches the Keys, breezes will continue to diminish. A second area of high pressure will push southeastward off the Carolinas Saturday through Sunday. This will result in freshening northeast breezes Saturday night, becoming east to southeast on Sunday.

Gulf Stream
The Approximate Shoreward Edge of the Gulf Stream as of January 21...
- 33 NM South of Dry Tortugas Light...on Loggerhead Key.
- 20 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
- 17 NM South of Sand Key Light...off Key West.
- 18 NM South of Looe Key...off Big Pine Key.
- 18 NM South of Sombrero Key Light...off Marathon.
- 14 NM Southeast of Alligator Reef Light...off Islamorada.
- 9 NM Southeast of Molasses Reef Light...off Key Largo.
- 8 NM East of Carysfort Reef Light...off Ocean Reef.
Area Forecast Discussion
National Weather Service Key West FL
1006pm EST Wednesday Jan 20 2021

A large anticyclonic gyre has developed over the Western Caribbean, the Gulf of Mexico, and the southern tier of the United States. Water vapor imagery highligheights a broad expanse of dry and stable air over Central America and the Caribbean, with moisture streaming northeast into the Ohio River Valley. The surface high centered over the northeastern Gulf of Mexico supports gentle to moderate northeast breezes across the Florida Keys. Temperatures are in the 60s with dewpoints near 60. Skies are clear and the KBYX radar is echo free. After a record low for-the-date PW this morning, the 00Z vertical profile was dry and inhibited. The overnight forecast calls for lows in the mid 60s with no rain chance.

Marine
There are no watches, warnings, or advisories currently in effect for the coastal waters of the Florida Keys. From synopsis, moderate breezes are expected for the coastal waters of the Florida Keys overnight. A ridge of high pressure will continue to push southward through Florida Thursday and Thursday night. As the ridge axis approaches the Keys, breezes will diminish. A second area of high pressure will push southeastward off the Carolinas Saturday through Sunday. This will result in freshening northeast breezes Saturday night, becoming east to southeast on Sunday.

NOAA Key West FL Office: Watches - Warnings - Advisories
FL...None. GM...None.