Marine Weather Net

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


OVERNIGHT

VARIABLE
WINDS
5 KNOTS

SATURDAY

VARIABLE
WINDS
5 KNOTS

SATURDAY NIGHT

N
WINDS
5 - 10
KNOTS

SUNDAY

VARIABLE
WINDS
5 - 10
KNOTS

The Marine Weather Forecast In Detail:
GMZ035 Forecast Issued: 1037 PM EDT Fri Sep 18 2020

Overnight...Variable Winds Near 5 Knots. Seas Less Than 1 Foot. Nearshore Waters Smooth. Isolated Showers And Thunderstorms.
Saturday...Variable Winds Near 5 Knots. Seas Less Than 1 Foot. Nearshore Waters Smooth. Isolated Showers And Thunderstorms.
Saturday Night...North Winds 5 To 10 Knots. Seas 1 Foot Or Less. Nearshore Waters Smooth To A Light Chop. Isolated Showers And Thunderstorms.
Sunday...Variable Winds 5 To 10 Knots. Seas 1 Foot Or Less. Nearshore Waters Smooth To A Light Chop. Scattered Showers And Isolated Thunderstorms.
Sunday Night...Northeast Winds Increasing To Near 20 Knots. Seas 1 To 2 Feet, Building To 2 To 4 Feet. Nearshore Waters Becoming Rough. Scattered Showers And Thunderstorms.
Monday...Northeast To East Winds 15 To 20 Knots. Seas 2 To 3 Feet, Except 4 To 5 Feet West Of The The Marquesas Keys. Nearshore Waters Choppy. Scattered Showers And Thunderstorms.
Monday Night...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. Scattered Showers And Thunderstorms.
Tuesday...Northeast To East Winds Near 20 Knots. Seas 2 To 4 Feet, Except 4 To 5 Feet West Of The Marquesas Keys. Nearshore Waters Rough. Scattered Showers And Isolated Thunderstorms.
Tuesday Night...Northeast To East Winds 15 To 20 Knots. Seas 2 To 4 Feet. Nearshore Waters Choppy. Scattered Showers And Isolated Thunderstorms.
Wednesday...East Winds 15 To 20 Knots. Seas 2 To 3 Feet. Nearshore Waters Choppy. Scattered Showers And Isolated Thunderstorms.
Wednesday Night...East Winds Near 15 Knots. Seas 1 To 3 Feet. Nearshore Waters A Moderate Chop. Scattered Showers And Isolated Thunderstorms.
SHARE THIS PAGE:           
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas: GMZ005
1037 PM EDT Fri Sep 18 2020

A weak pressure pattern is expected across the coastal waters of the Florida Keys tonight through Sunday. As a result, light and variable breezes will prevail. Northeast breezes are expected to freshen Sunday night and Monday, with strong breezes expected Monday night. Breezes will remain enhanced Tuesday through Wednesday night.

Gulf Stream
The Approximate Shoreward Edge of the Gulf Stream as of September 19...
- 25 NM South of Dry Tortugas Light...on Loggerhead Key.
- 35 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
- 32 NM South of Sand Key Light...off Key West.
- 26 NM South of Looe Key...off Big Pine Key.
- 20 NM South of Sombrero Key Light...off Marathon.
- 12 NM Southeast of Alligator Reef Light...off Islamorada.
- 9 NM Southeast of Molasses Reef Light...off Key Largo.
- 5 NM East of Carysfort Reef Light...off Ocean Reef.
Area Forecast Discussion
National Weather Service Key West FL
1041pm EDT Fri September 18 2020

Currently - A weak pressure pattern is in place across the area with a trough off the Atlantic coast and a dying ridge axis to our south. As a result winds are light and variable across the Keys and surrounding waters. While ridging remains in place in the mid and upper levels, the lower level ridge is almost gone. This evenings sounding indicated a thin low level inhibiting layer, likely left over cuban shadow. Winds are now westerly through the lowest levels. There have been only a few short lived showers on Keys waters this evening.

Short Term Update
Weak flow will remain across the area with a col meandering around the forecast area. In general winds will slowly clock from northwest to northeast then east. While a few showers and thunderstorms cannot be ruled out, chances will be slim at best. No changes planned for the local forecast.

Marine
A weak pressure pattern will prevail on Keys waters through the overnight period. A col working its way eastward across the area will result in winds generally clocking from northwest to north to east to southeast but with considerable variability with regards to location and timing.

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