Marine Weather Net

Straits of Florida from Craig Key to West End of Seven Mile Bridge out 20 - 60 NM Marine Forecast


OVERNIGHT

NNE
WINDS
5 - 10
KNOTS

MONDAY

SW
WINDS
5 - 10
KNOTS

MONDAY NIGHT

WSW
WINDS
10
KNOTS

TUESDAY

NW
WINDS
5 - 10
KNOTS

The Marine Weather Forecast In Detail:
GMZ073 Forecast Issued: 1014 PM EST Sun Jan 26 2020

Overnight...North To Northeast Winds 5 To 10 Knots, Becoming Variable 5 Knots Or Less After Midnight. Seas 1 To 3 Feet. Isolated Showers After Midnight.
Monday...Southwest Winds 5 To 10 Knots, Increasing To Near 10 Knots. Seas 1 To 2 Feet. Isolated Showers.
Monday Night...Southwest To West Winds Near 10 Knots. Seas 1 To 3 Feet. Numerous Showers. Isolated Thunderstorms Over The Western Straits.
Tuesday...Northwest Winds 5 To 10 Knots. Seas 1 To 2 Feet. Scattered Showers.
Tuesday Night...Northwest To North Winds Near 5 Knots. Seas 1 To 2 Feet. Scattered Showers.
Wednesday...Northwest To North Winds Near 5 Knots, Becoming Southwest To West In The Afternoon. Seas 1 To 2 Feet. Isolated Showers.
Wednesday Night...West To Northwest Winds 5 To 10 Knots. Seas 1 To 2 Feet. Scattered Showers.
Thursday...North To Northeast Winds 5 To 10 Knots. Seas 1 To 2 Feet. Isolated Showers.
Thursday Night...East Winds 5 To 10 Knots. Seas 1 To 2 Feet. Isolated Showers.
Friday...Southeast Winds 10 To 15 Knots. Seas 2 To 4 Feet. Scattered Showers.
Friday Night...South Winds 10 To 15 Knots. Seas 3 To 5 Feet. Scattered Showers.
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Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas: GMZ005
1014 PM EST Sun Jan 26 2020

A weakening high will drift southeast through Central Florida overnight and to the Bahamas by early Monday. A small low pressure center will move east on Monday to the northeast Gulf, slowly dragging a front through the Keys waters on Monday night and Tuesday. A weak pressure pattern will prevail Tuesday night. Another low center will move east through the Gulf on Wednesday, quickly crossing the Florida Peninsula on Wednesday night. A trailing cold front will push across the Keys waters. Then the waters will come under the southern periphery of moderate high pressure moving east through the Great Lakes region on Thursday.

Gulf Stream
The Approximate Shoreward Edge of the Gulf Stream as of January 25...
- 18 NM South of Dry Tortugas Light...on Loggerhead Key.
- 11 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
- 14 NM South of Sand Key Light...off Key West.
- 7 NM South of Looe Key...off Big Pine Key.
- 6 NM South of Sombrero Key Light...off Marathon.
- 5 NM Southeast of Alligator Reef Light...off Islamorada.
- 2 NM Southeast of Molasses Reef Light...off Key Largo.
- 2 NM East of Carysfort Reef Light...off Ocean Reef.
Area Forecast Discussion
National Weather Service Key West FL
947pm EST Sunday Jan 26 2020

Clear skies and dry conditions prevail across the Florida Keys on this Sunday evening, with satellite imagery showing only some low clouds over the eastern Straits of Florida, along with wispy cirrus passing by to our north. Radar depicts no precipitation across the service area. The clear skies combined with very light winds and relatively low dewpoints in the 50s have allowed for excellent radiational cooling during the evening, with the RAWS site at North Big Pine dropping all the way down to 51 degrees already, and a few other interior sites in the Lower Keys such as Sugarloaf Shores and the NWS office here in midtown Key West dropping into the mid to upper 50s. Elsewhere across the Keys, current temperatures range from around 60 to the mid 60s.

Surface analysis depicts weak high pressure over the eastern Gulf of Mexico and the Florida peninsula, with a weak low pressure area and associated cold front over the western Gulf. The 00Z Key West sounding sampled a very dry airmass in the wake of the previous front that moved through the Keys on Saturday, with a strong inversion based below 1000 feet, and very low PW value of 0.51 inches, which is below the 10th percentile for this date.

Overnight, clear skies may give way to some high clouds streaming in from the west late tonight, but the very dry airmass in place will continue to prevent any rainfall. The only forecast issue will be low temperatures, as continued good radiational cooling allows temps to approach or reach slowly rising dewpoints. Have updated the public forecasts to open up more of a range for overnight lows, mainly in the interior portions of the Lower Keys, based on current observations. No other updates are planned for this evening.

Marine
Evening observations show benign conditions across the Keys waters, with mostly northerly breezes of less than 10 knots prevailing. Light winds are expected to continue overnight, and no significant changes are planned for the late evening forecast issuance.

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