Marine Weather Net

Altamaha Sound to Fernandina Beach FL Marine Forecast


TODAY

SE
WINDS
5 - 10
KNOTS

TONIGHT

SSE
WINDS
5 - 10
KNOTS

FRIDAY

ESE
WINDS
5 - 10
KNOTS

FRIDAY NIGHT

S
WINDS
5 - 10
KNOTS

The Marine Weather Forecast In Detail:
AMZ450 Forecast Issued: 309 AM EDT Thu Aug 22 2019

Today...Southeast Winds 5 To 10 Knots. Seas 2 To 3 Feet. Dominant Period 9 Seconds. Inland Waters A Light Chop.
Tonight...South Southeast Winds 5 To 10 Knots. Seas 2 To 3 Feet. Dominant Period 8 Seconds. Inland Waters Smooth.
Friday...East Southeast Winds 5 To 10 Knots. Seas 2 To 3 Feet. Dominant Period 7 Seconds. Inland Waters Smooth.
Friday Night...South Winds 5 To 10 Knots. Seas 2 To 3 Feet. Dominant Period 6 Seconds. Inland Waters Smooth.
Saturday...Southeast Winds 5 To 10 Knots. Seas 2 To 3 Feet. Dominant Period 6 Seconds. Inland Waters Smooth. A Slight Chance Of Showers And Thunderstorms.
Saturday Night...Southeast Winds 5 To 10 Knots. Seas 2 To 3 Feet. A Chance Of Showers And A Slight Chance Of Thunderstorms.
Sunday...Northeast Winds 5 To 10 Knots. Seas 2 To 3 Feet. Showers And A Slight Chance Of Thunderstorms.
Sunday Night And Monday...East Southeast Winds 5 To 10 Knots. Seas 2 To 3 Feet. Showers And A Chance Of Thunderstorms.
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AMZ400: Synopsis for Altamaha Sound GA to Flagler Beach FL out to 60 nm
309 AM EDT Thu Aug 22 2019

Surface high pressure will extend over the waters today and Friday. A broad area of low pressure will approach the southeast Florida coast late Friday, then begin to lift northward this weekend.

Gulf Stream
The approximate location of the west wall of the Gulf Stream as of Aug 22, 2019 at 1200 UTC...
- 61 nautical miles east southeast of Flagler Beach.
- 72 nautical miles east of Saint Augustine Beach.
- 84 nautical miles east of Jacksonville Beach.
- 92 nautical miles east of St Simons Island.
Area Forecast Discussion
National Weather Service Jacksonville FL
300am EDT Thu August 22 2019

Near Term, Today and tonight
High pressure ridge remains across n Fl today similar to yesterday. Light winds will allow seabreezes to move inland with isolated to scattered inland convection expected this afternoon. A little higher areal coverage of storms are expected over interior se Ga where higher moisture values and less subsidence will exist north of the ridge axis. Afternoon temperatures will reach the lower 90s with heat indices in the 100-105 range. Convection will die out early this evening with lows tonight in the low 70s inland and mid 70s coast.

.Short Term
Friday through Sunday...On Friday, surface high pressure will be east of the region, with a lingering cold front to the north. In addition, a wave of low pressure will lift north into south Florida. At this point, looks like the ridging from the high to the east will provide enough subsidence to limit convection. However, with the onshore flow from the east, could have an intersection with the gulf sea breeze later in the day, which would enhance afternoon convective chances across I75 corridor.

Wave of low pressure to lift north up the east coast of Florida Friday night into Saturday. At this point, the strength of this system is uncertain. At minimum expecting scattered convection Saturday, with the best chances due to diurnal heating in the afternoon.

For Sunday, the low is expected to move to the northeast, but a trailing trough will exist across the forecast area, which would provide a focus for convective activity. So, will favor higher than average coverage for showers and storms.

Temperatures will trend a little above normal this period.

.Long Term...Sunday night through Wednesday...The trough will linger Sunday night in Monday, with high pressure building from the southeast Monday night into Tuesday. Numerous showers and storms will be expected Monday, due to convergence with trough conbined with diurnal heating. A cold front is forecast to move into the region from the northeast on Wednesday. At this point it looks like this front will stall as it enters forecast area, so forecasting scattered convection, rather than a line.

Expecting temperatures to trend near to a little above normal this period.

Marine Discussion
The Bermuda ridge axis will remain across the waters Today into Friday continuing a south to southeast flow across the waters with seas of 2 to 3 feet. A front will stall to the north of the waters this weekend while weak low pressure moves across the waters bringing an increase in shower and thunderstorm activity into early next week.

Rip Currents
Low risk today and Friday.

NOAA Jacksonville FL Office: Watches - Warnings - Advisories
FL...None. GA...None. AM...None.