Marine Weather Net

Altamaha Sound, GA to Fernandina Beach, FL 20 - 60 NM Marine Forecast


TODAY

W
WINDS
5 - 10
KNOTS

TONIGHT

S
WINDS
5 KNOTS

SATURDAY

NW
WINDS
5 - 10
KNOTS

SATURDAY NIGHT

NE
WINDS
5 - 10
KNOTS

The Marine Weather Forecast In Detail:
AMZ470 Forecast Issued: 340 AM EST Fri Nov 27 2020

Today...West Winds 5 To 10 Knots Becoming North 5 Knots Late In The Afternoon. Seas 3 To 4 Feet With A Dominant Period 9 Seconds.
Tonight...South Winds 5 Knots Becoming West 5 To 10 Knots After Midnight. Seas 3 To 4 Feet With A Dominant Period 9 Seconds. Slight Chance Of Showers After Midnight.
Saturday...Northwest Winds 5 To 10 Knots Becoming North In The Afternoon. Seas 3 To 4 Feet With A Dominant Period 9 Seconds. Chance Of Showers.
Saturday Night...Northeast Winds 5 To 10 Knots Increasing To 10 To 15 Knots After Midnight. Seas 3 To 4 Feet. Slight Chance Of Showers And Thunderstorms.
Sunday...Southeast Winds 10 To 15 Knots. Seas 3 To 5 Feet. Chance Of Showers And Slight Chance Of Thunderstorms.
Sunday Night...South Winds 15 To 20 Knots Increasing To 20 To 25 Knots After Midnight. Seas 5 To 7 Feet. Chance Of Showers And Slight Chance Of Thunderstorms.
Monday...Southwest Winds 20 To 25 Knots. Seas 5 To 7 Feet. Showers Likely And Slight Chance Of Thunderstorms.
Monday Night...West Winds 20 To 25 Knots. Seas 5 To 7 Feet.
Tuesday...West Winds 20 Knots. Seas 4 To 6 Feet.
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AMZ400: Synopsis for Altamaha Sound GA to Flagler Beach FL out to 60 nm
340 AM EST Fri Nov 27 2020

A cold front will move slowly southeast today and push south of our coastal waters early Saturday. High pressure will briefly build north of the waters on Saturday night with a period of easterly onshore winds and then progress eastward, moving off the Mid- Atlantic coast Sunday afternoon as low pressure rapidly strengthens over the lower Mississippi Valley and moves northeast. Showers and thunderstorms will then increase Sunday afternoon as the frontal boundary returns northward. Low pressure will continue to deepen as it moves north of the region Sunday night and Monday morning, driving a strong cold front across our waters by midday on Monday with a few strong thunderstorms possible ahead of this front, with Small Craft Advisory Conditions developing offshore. Strong low pressure will then remain nearly stationary over the Great Lakes region through midweek, with breezy offshore flow continuing over our waters and elevated seas prevailing offshore.
Area Forecast Discussion
National Weather Service Jacksonville FL
556am EST Fri Nov 27 2020

Near Term - Through Tonight
Dense fog that has developed overnight just west of the region is slowly advecting into our area over the suwannee valley and inland SE GA. This is due to low level moisture in place ahead of a weak cold front just NW of the region with dewpoints in the low to mid 60s over NE FL and SE GA. A low level ridge axis lies over NE and north central FL promoting weak flow in the boundary layer and also preventing the front from progressing farther SE into our area. Light southwest to westerly flow just above the boundary layer is helping bring further moisture from the Gulf of Mexico and helping to advect the fog from west to east along and north of I-10.The fog will advance near the the I-95 by sunrise and then begin to lift into low stratus until the late morning when further sunshine and the mixing of the boundary layer will mix out the remaining fog and low stratus.

Zonal flow aloft will carry a weak impulse of short wave energy over the area today, but low instability levels will keep chances for any thunderstorms mainly inland over far interior SE GA and near the suwannee valley of NE FL where an isolated storm may be possible this afternoon. Otherwise southwest winds 5-10 mph with partly cloudy skies over NE FL with partly to mostly skies over SE GA where widely scattered showers are possible west of highway 301. An atlantic seabreeze will push inland from the coast early this afternoon towards the I-95 corridor with winds behind it becoming easterly around 5-10 mph with an isolated shower possible near the coast north of Jacksonville as the seabreeze moves inland. Highs will be in the upper 70s over SE GA, along the GA coast, and into NE FL along I-10 with low 80s south of I-10 and near 80 degrees at the NE FL coast.

Tonight, the clouds will be on the increase after midnight as a stronger shortwave impulse moves towards the region from the west. This feature will help to push the cold front southeast into our area with scattered to numerous showers developing near the frontal boundary and pushing eastward along and north of I-10 from the west and approaching the coast by dawn. Some areas of fog will be possible south of I-10 closer to the low level ridge as it is nudged southward into central FL in response to the approaching cold front. Overnight lows will be in the low to mid 60s.

.SHORT TERM [Saturday Through Sunday]... A weak cold front will drift south into north Florida on Saturday as an upper trough drops se into the mid-Atlantic states. The front will then lift back north as a warm front on Sunday while a surface low deepens and moves ne across La/Ms ahead of a strong mid-upper level low. Scattered to numerous showers with isolated thunderstorms are expected over the area this weekend...becoming widespread Sunday night as a strong cold front approaches the area. Isolated strong storms are possible if enough instability can develop mainly Sunday night as a negatively tilted upper trough lifts ne across AL-Ga. Above normal temperatures will continue.

Long Term - Monday Through Friday
A strong cold front will push east across the area early Monday morning which will bring an end to the rain along with much colder temperatures. Brisk conditions are expected Monday through Tuesday as strong cold air advection drops temperatures into the 30s Monday night with wind chills in the mid/upper 20s to lower 30s by early Tuesday morning. High temperatures on Tuesday will only reach the 50s with strong northwest winds making it feel even colder. Tuesday night will be the coldest night as the pressure gradient relaxes and surface high pressure moves over the area. Winds will drop off allowing for strong radiational cooling with freezing temperatures expected over inland se Georgia and parts of inland northeast Florida along and north of the I-10 corridor. Lows will bottom out in the upper 20s and lower 30s in these areas with mid to upper 30s elsewhere. Temperatures will gradually moderate Wednesday and Thursday as high pressure shifts off the east coast allowing our winds to veer to the southeast. There will be a slight chance of showers on Thursday as an upper trough approaches from the west.

Marine
A cold front will move slowly southeast today and push south of our coastal waters early Saturday. High pressure will briefly build north of the waters on Saturday night with a period of easterly onshore winds and then progress eastward, moving off the Mid- Atlantic coast Sunday afternoon as low pressure rapidly strengthens over the lower Mississippi Valley and moves northeast. Showers and thunderstorms will then increase Sunday afternoon as the frontal boundary returns northward. Low pressure will continue to deepen as it moves north of the region Sunday night and Monday morning, driving a strong cold front across our waters by midday on Monday with a few strong thunderstorms possible ahead of this front and Small Craft Advisory Conditions developing offshore. Strong low pressure will then remain nearly stationary over the Great Lakes region through midweek, with breezy offshore flow continuing over our waters and elevated seas prevailing offshore.

Rip Currents
Low risk for NE FL and SE GA beaches.

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