Marine Weather Net

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


TODAY

N
WINDS
20 - 30
KNOTS

TONIGHT

SW
WINDS
5 - 10
KNOTS

WEDNESDAY

W
WINDS
10 - 15
KNOTS

WEDNESDAY NIGHT

SW
WINDS
10 - 15
KNOTS

The Marine Weather Forecast In Detail:
AMZ470 Forecast Issued: 310 AM EDT Tue Mar 19 2024

GALE WARNING IN EFFECT UNTIL 8 AM EDT THIS MORNING ...SMALL CRAFT ADVISORY IN EFFECT FROM 8 AM THIS MORNING TO 1 PM EDT THIS AFTERNOON...
Today...North Winds 20 To 30 Knots, Diminishing To 10 To 15 Knots In The Afternoon. Seas 5 To 8 Feet, Subsiding To 3 To 5 Feet In The Afternoon. Dominant Wave Period 6 Seconds.
Tonight...Southwest Winds 5 To 10 Knots, Becoming West 10 To 15 Knots After Midnight. Seas 3 To 4 Feet With A Dominant Period 8 Seconds.
Wednesday...West Winds 10 To 15 Knots, Becoming Southwest In The Afternoon. Seas 3 To 4 Feet With A Dominant Period 8 Seconds.
Wednesday Night...Southwest Winds 10 To 15 Knots, Becoming Northwest 5 To 10 Knots After Midnight. Seas 2 To 3 Feet With A Dominant Period 8 Seconds.
Thursday...Northeast Winds Around 5 Knots, Becoming East In The Afternoon. Seas Around 2 Feet With A Dominant Period 8 Seconds.
Thursday Night...Southeast Winds 10 To 15 Knots. Seas 2 To 3 Feet With A Dominant Period 7 Seconds. A Chance Of Showers After Midnight.
Friday...Southeast Winds 20 To 25 Knots. Seas 3 To 5 Feet, Building To 6 To 8 Feet In The Afternoon. Showers With A Slight Chance Of Thunderstorms.
Friday Night...South Winds 20 To 25 Knots, Becoming Southwest 15 To 20 Knots After Midnight. Seas 6 To 8 Feet. Showers Likely With A Chance Of Thunderstorms.
Saturday...West Winds 15 To 20 Knots. Seas 6 To 8 Feet. A Slight Chance Of Showers.
Saturday Night...North Winds 20 To 25 Knots. Seas 6 To 9 Feet. A Slight Chance Of Showers And Thunderstorms. Winds And Seas Higher In And Near Thunderstorms.
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Area Forecast Discussion
National Weather Service Jacksonville FL
352am EDT Tuesday Mar 19 2024

...MUCH COLDER TODAY... ...New NEAR TERM, SHORT TERM, LONG TERM,

Marine
IRE WEATHER,Hydrology
Near Term
(Today through Tonight)

Issued at 340am EDT Tuesday Mar 19 2024

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

Colder and much drier air is pouring through the area with a strong pressure rises of 3-6 mb giving support for the gusty winds that have been 30-40 mph in a few places. Even a 44 mph at NAS JAX and SGJ. Pressure rises have diminish a bit since a few hours ago. Dewpoints have also crashed in the 20s and even a few upper teens just to the northwest of the forecast area. Lowest wind chill readings around 7-8am this morning will be over inland southeast GA and into the Suwannee Valley in the upper 20s to around 30, and elsewhere in the mid to upper 30s.

For Today, mid/upper level trough will move offshore this period with mid level flow slowly becoming more zonal, with 500 mb heigheights slowly rising and a shortwave ridge across TX will move ever so slowly east. Surface high across the ARLATEX area this morning will shift southeast to east, and to a position to across the north Gulf coast with surface ridge extending across north central FL by tonight. Locally, clear skies and below seasonal temps given the cool advection pattern in place, with highs in the 60s most locations, about 10 deg below normal. Onshore flow at the coast may keep them at only about 59-60 today. Winds will be gusty in the morning to 15-25 mph , but will lighten up through late morning and afternoon. Tonight, clear skies and light winds will allow for very good radiational cooling. Will go with a blend of MOS and NBM, leaning toward a bit cooler than NBM. Patchy frost possible well inland were we have some min temps in the middle 30s. Closer to the coast, upper 30s to around 40 as we may a bit off an offshore flow as the high pressure ridge will be toward the FL Big Bend.

.SHORT TERM... (Wednesday through Thursday night) Issued at 340am EDT Tuesday Mar 19 2024

A surface high dominates the region for Wednesday before making its way off the Atlantic Coast Wednesday night. This will create mostly clear skies with temperatures in the low to mid 70s, cooling into the mid to upper 40s inland overnight with coastal temperatures in the low 50s. Thursday, day time temperatures will be in the upper 70s staying a few degrees cooler along the coast. A surface low will begin to form in the Gulf Thursday night with some upper level instability (shortwave troughs) providing chances for overnight rain showers and thunderstorms late Thursday night into Friday morning.

Long Term
(Friday through Monday) Issued at 340am EDT Tuesday Mar 19 2024

The low pressure that formed in the Gulf will continue to push into the region Friday and make its way though NE FL and SE GA overnight. Scattered showers and thunderstorms will be expected area wide with temperatures staying mostly in the upper 60s for SE GA and low 70s for NE FL. Conditions will begin to clear behind the front with PWAT (Precipitable Water) values dropping under an inch by Sunday with temperatures warming into the mid to upper 70s by Monday.

Marine
Issued at 340am EDT Tuesday Mar 19 2024

Strong northwest to north winds expected through the early morning hours with the gale warning remaining in effect. Will tack on a small craft advisory as the gale expires this morning by about 8 AM, with the near-shore SCA (Small Craft Advisory) lasting only a short time, only about 2-3 hours, and the offshore lasting through late morning or early afternoon. with the highest seas expected well offshore waters of Flagler and St Johns counties near 7-8 ft. Winds and seas relax significantly otherwise by tonight as high pressure moves into the region, and the high will shift further south by late Wednesday. A weak backdoor front moves into the Carolinas Thursday, and may drop into southeast GA by Thursday afternoon and probably will stall. A storm system will be develop Thursday into early Friday morning over the GOMEX, with winds becoming more southeasterly Thursday night and increasing and seas building to small craft advisory levels, especially offshore waters. For now, it looks like the low pressure system is forecast to move across the FL peninsula Friday night. The low will move offshore to the northeast Saturday morning and afternoon. The period of small craft advy headlines looks to start Friday morning and continue through the weekend. In fact, winds look to flirt with gale warning criteria Sat night and Sunday.

Rip Currents
Moderate risk of rip currents along area northeast FL beaches with the flow more offshore or along shore for southeast GA beaches so low risk was placed there.

Fire Weather
Issued at 340am EDT Tuesday Mar 19 2024

After last nigheights cold front, high pressure is building into the region with a drier airmass in place. MinRH values will drop down into the upper teens and 20s this afternoon and into the 20 to 30 percent range on Wednesday, however low wind speeds and wet fuels will keep fire conditions from reaching elevated levels. On Thursday, some moisture recovery will occur with min RHs in the 30s. Overall, there are no fire weather concerns other than the low RH values expected across the region.

Hydrology
Issued at 340am EDT Tuesday Mar 19 2024

On the Altamaha River, moderate flooding is occurring at Baxley (and may have already has peaked) and is forecast at Everett City for later today, with rest of river at minor flooding. Minor flooding is now occurring for Satilla River at Atkinson. These levels will remain elevated into late week.

NOAA Jacksonville FL Office: Watches - Warnings - Advisories
FL...None. GA...None. AM...Gale Warning until 8am EDT this morning for AMZ450-452-454-470- 472-474.

Small Craft Advisory from 8am to 10am EDT this morning for AMZ450-452-454.

Small Craft Advisory from 8am this morning to 1pm EDT this afternoon for AMZ470-472-474.