Marine Weather Net

Straits of Florida from west end of Seven Mile Bridge to south of Halfmoon Shoal out 20 NM Marine Forecast


THIS AFTERNOON

SSW
WINDS
5 - 10
KNOTS

TONIGHT

THURSDAY

NNW
WINDS
10 - 15
KNOTS

THURSDAY NIGHT

ENE
WINDS
10
KNOTS

The Marine Weather Forecast In Detail:
GMZ054 Forecast Issued: 1029 AM EST Wed Jan 29 2020

This Afternoon...Variable Winds Near 5 Knots Becoming South To Southwest 5 To 10 Knots. Seas 1 To 2 Feet.
Tonight...Southwest To West Increasing To 10 To 15 Knots, Then West To Northwest By Morning. Seas Building To 2 To 4 Feet. Scattered Showers.
Thursday...Northwest To North Winds 10 To 15 Knots, Becoming North To Northeast Near 10 Knots In The Afternoon. Seas 2 To 3 Feet. Scattered Showers In The Morning.
Thursday Night...Northeast To East Winds Near 10 Knots, Becoming Southeast Late. Seas 1 To 3 Feet. Scattered Showers Late.
Friday...Southeast To South Winds Near 10 Knots. Seas 1 To 3 Feet. Scattered Showers In The Morning, Then Isolated Showers In The Afternoon.
Friday Night...South To Southwest Winds 10 To 15 Knots. Seas 2 To 4 Feet. Scattered Showers.
Saturday...Southwest Winds 15 To 20 Knots Becoming West To Northwest And Increasing To Near 20 Knots Late. Seas Building To 3 To 6 Feet Late. Seas Highest South Of Dry Tortugas. Scattered Showers.
Saturday Night...Northwest To North Winds 20 To 25 Knots, Decreasing To Near 20 Knots. Seas Building To 4 To 7 Feet. Isolated Showers.
Sunday...North Winds Near 20 Knots, Decreasing To 10 To 15 Knots. Seas 4 To 7 Feet.
Sunday Night...Northeast To East Winds 10 To 15 Knots. Seas 2 To 5 Feet.
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Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas: GMZ005
1029 AM EST Wed Jan 29 2020

A weak cold front will limp through our region late tonight and early Thursday morning, with high pressure well north of our area shifting quickly into the Atlantic through Thursday. A formidable cold front will move eastward and across our entire area by late Saturday.

Gulf Stream
The Approximate Shoreward Edge of the Gulf Stream as of January 28...
- 13 NM South of Dry Tortugas Light...on Loggerhead Key.
- 8 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
- 6 NM South of Sand Key Light...off Key West.
- 6 NM South of Looe Key...off Big Pine Key.
- 9 NM South of Sombrero Key Light...off Marathon.
- 13 NM Southeast of Alligator Reef Light...off Islamorada.
- 6 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
1045am EST Wednesday Jan 29 2020

Currently - Visible satellite shows sunny skies across the Keys, while the BYX radar shows no precipitation anywhere near the Keys. Surface observations reveal temperatures in the lower 70s across the Lower Keys and upper 60s across the Middle and Upper Keys. Winds are light and variable from the NE to E. Over our marine district, winds are 5 knots or less from the NE to E as well.

Short Term Update
Minor changes made on this update. First, cloud cover was adjusted for today across the Keys. Second, changes were made to the wind for portions of the marine districts for today. Otherwise, a front will pass through the region tonight into early Thursday with chance probability of precipitation (50 percent). This front will then sink south of the Keys, over the Florida Straits and Cuba and remain through the end of the week. Other than rain, the front will not bring any appreciable air mass changes. In the wake of this front, high pressure will pass well to the north for the balance of Thursday and into Friday. Daytime highs are forecast to remain in the upper 70s to near 80 and overnight lows in the upper 60s to near 70 into the start of the weekend.

Marine
Winds are currently light and variable around 5 knots or less for all waters. Winds will clock around to the south and southwest and increase this afternoon in advance of the weak front that is moving across the Gulf. Winds will continue to clock around to the west and northwest by this evening as the front traverses across the Keys and surrounding waters. Expect winds to freshen into the gentle to occasional moderate range through Thursday. High pressure will pass well to our north Thursday before emerging over the Atlantic by Friday and will serve to slacken winds briefly. Next front will move through late Friday into Saturday with a sharp increase in winds. Small Craft Advisories look likely behind the front Saturday into Sunday.

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