Altamaha Sound to Fernandina Beach FL Marine Forecast
| Tonight...Southwest Winds 20 To 25 Knots, Becoming West After Midnight. Seas 5 To 7 Feet, Occasionally To 9 Feet. Wave Detail: East 5 Feet At 12 Seconds And West 4 Feet At 4 Seconds. Intracoastal Waters Rough. A Slight Chance Of Showers This Evening. |
| Thursday...West Winds Around 20 Knots. Seas 4 To 6 Feet, Occasionally To 8 Feet. Wave Detail: Northwest 4 Feet At 4 Seconds And East 4 Feet At 11 Seconds. Intracoastal Waters Choppy. |
| Thursday Night...Northwest Winds Around 20 Knots. Seas 3 To 5 Feet, Occasionally To 6 Feet. Wave Detail: Northwest 4 Feet At 4 Seconds And East 3 Feet At 11 Seconds. Intracoastal Waters Choppy. |
| Friday...Northwest Winds 15 To 20 Knots, Diminishing To 5 To 10 Knots In The Afternoon. Seas 3 To 5 Feet, Occasionally To 6 Feet. Wave Detail: North 4 Feet At 5 Seconds And East 3 Feet At 12 Seconds. Intracoastal Waters Choppy. |
| Friday Night...Northwest Winds 5 To 10 Knots. Seas 3 To 4 Feet, Occasionally To 5 Feet. Wave Detail: East 3 Feet At 11 Seconds And North 2 Feet At 4 Seconds. Intracoastal Waters Light Chop. |
| Saturday And Saturday Night...Northeast Winds 5 To 10 Knots. Seas 2 To 3 Feet. Wave Detail: East 3 Feet At 10 Seconds And North 2 Feet At 4 Seconds. Intracoastal Waters Light Chop. |
| Sunday...Northeast Winds 10 To 15 Knots, Becoming East 15 To 20 Knots. Seas 2 To 4 Feet, Occasionally To 5 Feet. Intracoastal Waters Choppy. A Slight Chance Of Showers And Thunderstorms After Midnight. |
| Monday...Northeast Winds 15 To 20 Knots, Becoming Northwest. Seas 4 To 6 Feet, Occasionally To 8 Feet. Intracoastal Waters Choppy. A Slight Chance Of Showers In The Morning. A Slight Chance Of Thunderstorms Through The Day. A Chance Of Showers In The Afternoon, Then A Slight Chance Of Showers In The Evening. Winds And Waves Higher In And Near Thunderstorms. |
| Area Forecast Discussion National Weather Service Jacksonville FL 648pm EDT Wednesday Oct 29 2025 Issued at 640pm EDT Wednesday Oct 29 2025 Forecast remains on track a cold frontal passage this evening will bring a line of showers with a very brief heavy downpour and wind gusts around 30 mph expected. This activity will push into the Atlantic Coastal waters just after midnight with partial clearing skies and cooler temps with lows in the middle 40s inland SE GA, upper 40s inland NE FL, lower 50s along the Atlantic Coastal areas. Partly to Mostly Sunny and Windy on Thursday with highs only in the mid/upper 60s SE GA and around 70F across NE FL. Northwest winds at 15-25 mph with gusts around 35 mph, still expected to remain just below Wind Advisory criteria at this time. Near Term (through Tonight) An airmass change is already underway today as a highly-amplified upper trough pivots across the southeastern US. As it does, a warming, southerly flow will continue to push a surface warm front through SE GA early this afternoon. The other piece of the frontal system to push through the area will be the attendant cold front that will press west-to-east this evening, pushing off the Atlantic coast around midnight. Given the preceding dry air and short-window of moistening ahead of the front, a significant rain is unlikely despite the strong convergent forcing along the fronts leading edge. That said, latest GOES derived PWATs (Precipitable Waters) indicated a narrow band of moisture pooling right up along the frontal boundary. This moisture will spill into the Big Bend area and across NE FL this evening leading to a few fast-moving and low-topped showers and sprinkles between 6pm-11pm. With a high degree of certainty, there is not a threat thunderstorms with the aforementioned shower given the mid level capping in place. Most notable change tonight will be the clear skies and chilling temperatures falling to the low/mid 40s in SE GA and Suwannee Valley of NE FL, lower 50s in the southern/inland NE FL zones, and low/mid 50s at the beaches. .SHORT TERM...(Thursday through Friday night) Following a cold frontal passage in the early morning hours Thursday, it will be breezy, dry, and chilly across the area Thursday. Highs will only reach the mid to upper 60s generally north of I-10, with lower 70s south of I-10, with westerly winds of 10-15 mph. Winds will calm a bit on Friday, with temperatures staying in the upper 60s to low 70s as a dry front moves through. Overnight, lows Thursday will dip into the 40s for everywhere except the immediate Atlantic coast and St. Johns River basin region, and by Friday night some inland locations may see lows in the upper 30s. At this time there is low to medium potential for patchy frost formation early Saturday morning, mainly over portions of inland areas near Folkston/Nahunta/Hilliard/Macclenny, will keep a close eye on that forecast over the next two days. Long Term (Saturday through next Wednesday) High pressure building to the north will promote an onshore wind shift this weekend with pleasant weather, sunny with highs in the 70s. Saturday night into Sunday morning lows will dip into the 40s inland and 50s along the coast. Rain chances return Monday as a frontal system approaches, as of now these precipitation chances are at about 20-25% area-wide. Still a lot of model uncertainty with timing and thunderstorm impacts with this frontal system. By Tuesday onward it will be dry with high temperatures in the 70s. Marine Light southerly winds shift offshore tonight behind a fast-moving cold which may bring showers across the waters between midnight and sunrise Thursday. Small Craft Advisory conditions are expected with offshore winds with gusts up to 30 knots through Thursday with winds lowering to Caution levels Friday, though elevated seas (6-9 ft) are likely to continue offshore through Friday afternoon. High pressure will build from the west and then north of the waters through the Saturday resulting in fair maritime conditions. By Sunday another Gulf low will send a stationary front to the south northward as a warm front into our waters. As the low develops, strengthening onshore winds to at least Caution levels is expected Sunday into Monday. That same low is expected to lift across the area early next bringing rain and isolated thunderstorms across portions of the local waters Monday. Hydrology A Coastal Flood Advisory for a portion of the St Johns River, extending from downtown Jacksonville to Lake George continues through late this evening with waters levels potential rising to 1.50-1.75 feet Mean-Higher-High-Water. Southerly flow this afternoon followed by a predominant offshore wind tomorrow should lower tidal levels below Minor Flood levels after this evening's high tide cycle. The next perigean spring tide will occur next week, with the full moon occurring Wednesday. This will raise water levels to Minor Flood levels without the influence of onshore or nor'easter-type flow events. With the overall large-scale pattern uncertainty next week as a result of a large cutoff upper low's evolution. This will dictate the development and movement of a surface low which may trigger an onshore wind response, amplifying tidal levels. NOAA Jacksonville FL Office: Watches - Warnings - Advisories FL...High Rip Current Risk until 1am EDT Thursday for FLZ124-125-138- 233-333. Coastal Flood Advisory until 1am EDT Thursday for FLZ132-137- 325-633. GA...None. AM...Small Craft Advisory from 11pm this evening to 5am EDT Friday for AMZ450-452-454. Small Craft Advisory until 2pm EDT Friday for AMZ470-472-474.. |
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