Marine Weather Net

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


TODAY

N
WINDS
20
KNOTS

TONIGHT

N
WINDS
15 - 20
KNOTS

WEDNESDAY

N
WINDS
15 - 20
KNOTS

WEDNESDAY NIGHT

N
WINDS
10 - 15
KNOTS

The Marine Weather Forecast In Detail:
AMZ470 Forecast Issued: 220 AM EST Tue Jan 14 2025

SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS EVENING
Today...North Winds Around 20 Knots. Seas 4 To 6 Feet, Occasionally To 8 Feet. Wave Detail: North 4 Feet At 5 Seconds.
Tonight...North Winds 15 To 20 Knots. Seas 3 To 5 Feet, Occasionally To 6 Feet. Wave Detail: North 4 Feet At 5 Seconds And East 2 Feet At 13 Seconds.
Wednesday...North Winds 15 To 20 Knots. Seas 4 To 6 Feet, Occasionally To 8 Feet. Wave Detail: North 5 Feet At 6 Seconds And East 2 Feet At 12 Seconds.
Wednesday Night...North Winds 10 To 15 Knots. Seas 3 To 5 Feet, Occasionally To 6 Feet. Wave Detail: Northeast 4 Feet At 7 Seconds And East 2 Feet At 12 Seconds.
Thursday And Thursday Night...Northwest Winds 15 To 20 Knots. Seas 3 To 4 Feet, Occasionally To 5 Feet. Wave Detail: Northwest 4 Feet At 4 Seconds And Northeast 4 Feet At 7 Seconds.
Friday...North Winds 10 To 15 Knots, Becoming South. Seas 2 To 4 Feet, Occasionally To 5 Feet. Wave Detail: South 3 Feet At 4 Seconds And Northwest 3 Feet At 4 Seconds. A Slight Chance Of Showers Through The Night.
Saturday...Southwest Winds 15 To 20 Knots. Seas 3 To 5 Feet, Occasionally To 6 Feet. A Chance Of Showers In The Morning, Then Showers.
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Area Forecast Discussion
National Weather Service Jacksonville FL
558am EST Tuesday Jan 14 2025

Near Term
Issued at 220am EST Tuesday Jan 14 2025

For the latest NE FL and SE GA Daily Key Messages please visit: https://www.weather.gov/media/jax/briefings/nws-jax-briefing.pdf

Temperatures still hovering near 40F for locations across northern SE GA early this morning. Skies are beginning to clear as low ceilings continue to shift southward as high pressure builds into the region behind the cold front. Patchy fog will also look to develop as low winds will be present for a couple of hours prior to sunrise, with localized dense fog possible. Will continue to monitor temperatures through the early morning hours, as some patchy/areas of frost in addition to icy conditions over the roadways may begin to develop if temperatures continue to lower to near freezing for locations in northern SE GA.

With high pressure building into the region, northwesterly- northerly winds will continue to bring cold air into the area. Daytime highs will remain in the mid to upper 50s for most locations, with the exception being those locations in north central Florida reaching into the lower 60s. By the overnight hours, temperatures will again dip close to the lower 30s over most of SE GA and into the mid 30s over NE FL. Some patchy frost may again be possible. Lows currently are expected to remain just above freezing and widespread frost is not expected as cloud cover looks to move in near sunrise on Wednesday, keeping confidence low for a need for any Frost/Freeze products at this time. Will re- evaluate during the next forecast package.

.SHORT TERM... (Wednesday through Thursday night) Issued at 220am EST Tuesday Jan 14 2025

Wednesday...High pressure ridge and dry northwest flow remain in place across the region. Dry and cooler than normal conditions will continue with highs only in the 50s under partly sunny skies as high clouds continue to stream across the region.

Wednesday Night...High pressure ridge will remain in place at the surface with a Northwest steering flow. Aloft there will still be abundant moisture streaming in mid/high clouds across the FL Peninsula with mostly cloudy skies across NE FL and even a slight chance of showers with enough mid level moisture, mainly south of the I-10 corridor. Lows will generally be in the mid/upper 30s across NE FL, with the atmosphere likely just warm enough to support cold rain showers late at night in this region. Further north across SE GA, less cloudiness is expected with low temps closer to 30F and a light freeze is expected once again. Frost is expected but coverage will depend on cloud cover around sunrise Thursday Morning.

Thursday...High pressure ridge settles further south across the North Gulf and across the FL Peninsula at the surface and this will also shift the high cloudiness to the south with Mostly sunny skies developing along with dry conditions and continued below normal temps with highs still only in the 50s.

Thursday Night...High pressure ridge nudges closer to the region and expect mostly clear skies and near calm winds to provide for the coldest night of the week. Low temps will fall into the upper 20s across SE GA and near 30F across inland NE FL with widespread light freeze and frost expected for all areas except the Atlantic beachfront locations, where temps fall into the middle 30s.

Long Term
(Friday through Monday) Issued at 220am EST Tuesday Jan 14 2025

Friday...High pressure overhead will lead to mostly sunny skies, light winds and temps rebounding closer to normal values in the lower 60s. Not as cold Friday Night as high pressure pushes into the Atlantic and light south winds develop along with an increase in high clouds and seasonably cool low temps in the 40s.

Saturday...Long range models in decent agreement in bringing next round of rainfall by late Saturday into Saturday Night with some model rainfall amounts 1-2 inches or so area-wide, still mostly on the beneficial side due to longer term deficit in rainfall so far this winter. Max temps will surge briefly to above normal levels ahead of the rainfall into the 65-70F range across SE GA and into the 70-75F range across NE FL, which will be accompanied by breezy South to Southwest winds at 15-25 mph with gusts of 30-35 mph expected. Just ahead of the lagging frontal passage expect above normal lows only in the 50s Saturday Night.

Sunday...Confidence in forecast decreases in this time frame as the ECMWF (European Centre for Medium-Range Weather Forecasts) lags the trailing frontal passage much slower than the latest and faster GFS (Global Forecast System) solution with potential for lingering rainfall chances and highs remaining in the 60s. More confidence that the trailing frontal boundary should clear the region by Sunday Night with temps falling into the 40s.

Monday...Very low confidence by early next week as the GFS rapidly brings moisture from the Gulf back into the area by Monday Night, while the ECMWF remains dry with cooler than normal temps. For now the forecast will call for below normal temps with highs in the 50s and lows in the 30s with slight chances for rainfall, but will need to keep a close eye on potential Gulf low development which was shown in previous runs, which could result in frozen precipitation chances for some of the local forecast area, but of course way too soon for any details.

Marine
Issued at 220am EST Tuesday Jan 14 2025

An area of low pressure is currently in place south of the local waters, bringing northerly winds or around 20 knots and gusts up to 30 knots for portions of the local waters today and tonight. A Small Craft Advisory will be in place until Tuesday evening for most of the local waters, while Small Craft Exercise Caution for near shore waters from Altamaha Sound, GA to Fernandina Beach, FL. High pressure begins to build into the region by midweek into the end of the week.

Rip Currents
Moderate risk of rip currents for local beaches through Wednesday.

NOAA Jacksonville FL Office: Watches - Warnings - Advisories
FL...None. GA...Freeze Warning until 9am EST this morning for GAZ132>136-149.

Frost Advisory until 9am EST this morning for GAZ151>153-162- 163-250.

AM...Small Craft Advisory until 7pm EST this evening for AMZ452-454- 470-472-474.