Marine Weather Net

Altamaha Sound to Fernandina Beach FL Marine Forecast


10 - 15


10 - 15


5 - 10


5 - 10

The Marine Weather Forecast In Detail:
AMZ450 Forecast Issued: 308 PM EST Mon Mar 08 2021

Tonight...Northeast Winds 10 To 15 Knots. Seas 4 To 6 Feet With A Dominant Period 7 Seconds. A Light Chop On The Intracoastal Waters.
Tuesday...Northeast Winds 10 To 15 Knots. Seas 3 To 5 Feet With A Dominant Period 8 Seconds. A Moderate Chop On The Intracoastal Waters.
Tuesday Night...East Winds 5 To 10 Knots. Seas 3 To 4 Feet With A Dominant Period 7 Seconds. Mostly Smooth On The Intracoastal Waters.
Wednesday...East Winds 5 To 10 Knots. Seas 3 To 4 Feet. A Light Chop On The Intracoastal Waters.
Wednesday Night...East Winds 5 To 10 Knots. Seas 3 To 4 Feet. Mostly Smooth On The Intracoastal Waters.
Thursday...East Winds 5 To 10 Knots. Seas 3 To 4 Feet. A Light Chop On The Intracoastal Waters.
Thursday Night...East Winds 5 To 10 Knots. Seas 3 To 5 Feet.
Friday...East Winds 5 To 10 Knots. Seas 3 To 5 Feet.
Friday Night...Southeast Winds 5 To 10 Knots. Seas 3 To 5 Feet.
Saturday...Southeast Winds 5 To 10 Knots. Seas 3 To 5 Feet.
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AMZ400: Synopsis for Altamaha Sound GA to Flagler Beach FL out to 60 nm
917 AM EST Mon Mar 8 2021

High pressure will settle across Georgia today as winds and seas decrease. The high will remain over the region Tuesday then will move offshore of the Carolina Atlantic Coast Wednesday. The high will linger offshore of the southeast Atlantic coast through the end of the week with an extended period of easterly flow over the local waters.

Gulf Stream
The approximate location of the west wall of the Gulf Stream as of Mar 06, 2021 at 1200 UTC...
- 59 nautical miles east of Flagler Beach.
- 68 nautical miles east of Saint Augustine Beach.
- 83 nautical miles east of Jacksonville Beach.
- 88 nautical miles east southeast of St Simons Island.
Area Forecast Discussion
National Weather Service Jacksonville FL
315pm EST Monday Mar 8 2021

Near Term - Through Tonight
Sunny skies have allowed temperatures to rise into the low to mid 60s areawide amid a cool, breezy onshore flow. Surface high pressure will consolidate along the southeastern coast tonight as ridge axis aloft noses northeastward from the Gulf of Mexico. As this occurs, surface gradients will loosen slightly resulting in light to near calm winds tonight. Clear skies and near calm conditions will allow excellent radiational cooling overnight which will help lows fall to well below normal readings. Lows are will be in the low to mid 30s across inland southeast GA, upper 30s to low 40s across inland northeast FL, and in the low 50s along the immediate coast with the onshore flow. Some areas across north may touch the freezing mark but this is expected to brief and localized, so opted against any freeze headlines. That said, similar to this morning, areas of frost will be possible across inland locations of southeast GA Tonight, thus a Frost Advisory has been headlined.

Short Term - Tuesday Through Wednesday Night
Lower tropospheric high pressure will become centered across southeast GA on Tuesday, weakening flow . Meanwhile, a weak mid- level impulse will drift eastward toward the Mid-Atlantic region through Tuesday night. This will escort mid and high level cloud cover into and across the area through Wednesday morning. Under clear skies along with persistent onshore flow, temperatures will trend a bit warmer with highs in the upper 60s and low 70s Tuesday afternoon. High clouds will limit radiative cooling Tuesday night, keeping lows right around normal.

High pressure and ridging aloft will continue to dominate through Wednesday as it expands and broadens eastward into the western Atlantic. This will increase the onshore flow component as surface winds veer more easterly through Wednesday. High clouds will continue to drift overhead through Wednesday atop the apex of the ridge aloft. Increasing onshore flow will trend dewpoints upward and may allow for scattered stratocumulus along the coast. Temperatures will continue to trend toward normal and may rise a degree or two above normal by Wednesday afternoon.

Long Term - Thursday Through Monday
Dry conditions and warming temperatures will continue through the weekend as layered ridging dominates the pattern. Prolonged moistening onshore flow and light winds increase fog potential each morning late this week and into the weekend. Our next shot at rain will be early next week as a broad cutoff upper low across the southern Plains ejects northward ahead of another potent upstream system, digging across the western US. That said, there is considerable uncertainty with the associated surface front, which may stall north of the area. Temperatures will trend warmer and eventually above normal by the weekend.

Onshore flow will continue to weaken through mid week as near-stationary high pressure centers itself slightly west of the area waters across southeastern Georgia. Wind and combined seas will continue to decrease, alleviating hazardous small craft conditions. Fair boating conditions and lighter onshore winds are expected to continue through the week and into the weekend as high pressure expands into the the western Atlantic.

RIP CURRENTS: High Risk at northeast Florida beaches through Tuesday while a Moderate Risk is expected along the southeast Georgia beaches.

Fire Weather
Dispersion will decrease to lower end values across southeast GA on Tuesday as high pressure becomes centered over the area, limiting transport winds. Meanwhile daytime dispersion further south across northeast FL will be more favorable, generally ranging from 30-60 units. Transport flow will increase Wednesday as high pressure expands into the western Atlantic. Afternoon RH will remain near critical across portions of southeast GA on Wednesday. Considerably RH increase is expected through the week with prolonged period of moistening onshore flow, which may lead to morning fog potential late in the week.

NOAA Jacksonville FL Office: Watches - Warnings - Advisories
FL...High Rip Current Risk through Tuesday evening for Coastal Duval- Coastal Flagler-Coastal Nassau-Coastal St. Johns.

GA...Frost Advisory from 4am to 8am EST Tuesday for Appling- Atkinson-Bacon-Brantley-Clinch-Coffee-Inland Camden-Inland Glynn-Jeff Davis-Northeastern Charlton-Northern Ware-Pierce- Southern Ware-Wayne-Western Charlton.