Altamaha Sound to Fernandina Beach FL Marine Forecast
| Rest Of Today...Northeast Winds 25 To 30 Knots With Gusts Up To 40 Knots. Seas 5 To 6 Feet, Occasionally To 8 Feet, Building To 5 To 8 Feet, Occasionally To 10 Feet This Afternoon. Wave Detail: Northeast 5 Feet At 5 Seconds And East 3 Feet At 8 Seconds, Becoming Northeast 8 Feet At 7 Seconds And East 2 Feet At 8 Seconds. Intracoastal Waters Very Rough. A Chance Of Showers With A Slight Chance Of Thunderstorms Late This Morning, Then Showers With A Chance Of Thunderstorms This Afternoon. |
| Tonight...Northeast Winds 25 To 30 Knots With Gusts Up To 40 Knots. Seas 7 To 10 Feet, Occasionally To 13 Feet. Wave Detail: Northeast 9 Feet At 8 Seconds. Intracoastal Waters Very Rough. Showers With A Chance Of Thunderstorms. |
| Friday...Northeast Winds 25 To 30 Knots With Gusts Up To 40 Knots. Seas 7 To 10 Feet, Occasionally To 13 Feet. Wave Detail: Northeast 9 Feet At 8 Seconds And Northeast 2 Feet At 4 Seconds. Intracoastal Waters Very Rough. Showers Likely With A Chance Of Thunderstorms. |
| Friday Night...Northeast Winds 25 To 30 Knots With Gusts Up To 40 Knots. Seas 7 To 9 Feet, Occasionally To 11 Feet. Wave Detail: Northeast 9 Feet At 8 Seconds. Intracoastal Waters Very Rough. Showers Likely With A Chance Of Thunderstorms. |
| Saturday...North Winds 25 To 30 Knots With Gusts Up To 40 Knots. Seas 6 To 9 Feet, Occasionally To 11 Feet. Wave Detail: Northeast 9 Feet At 10 Seconds And North 4 Feet At 7 Seconds. Intracoastal Waters Very Rough. A Chance Of Showers With A Slight Chance Of Thunderstorms. |
| Saturday Night...North Winds 25 To 30 Knots With Gusts Up To 40 Knots, Diminishing To 15 To 20 Knots After Midnight. Seas 6 To 9 Feet, Occasionally To 11 Feet. Wave Detail: Northeast 9 Feet At 9 Seconds And North 4 Feet At 6 Seconds. Intracoastal Waters Very Rough. A Slight Chance Of Showers And Thunderstorms In The Evening. |
| Sunday...Northwest Winds 15 To 20 Knots, Diminishing To 10 To 15 Knots. Seas 5 To 7 Feet, Occasionally To 9 Feet, Subsiding To 4 To 5 Feet, Occasionally To 6 Feet After Midnight. Intracoastal Waters Choppy. |
| Monday...Northwest Winds 10 To 15 Knots, Becoming West 5 To 10 Knots. Seas 4 To 5 Feet, Occasionally To 6 Feet. Intracoastal Waters A Moderate Chop. Winds And Waves Higher In And Near Thunderstorms. |
| Area Forecast Discussion National Weather Service Jacksonville FL 136pm EDT Thu Oct 9 2025 Near Term (Through Tonight) Issued at 1223pm EDT Thu Oct 9 2025 Nor'easter conditions will continue to ramp up tonight as high pressure continues to wedge down the SE US coastline and produces a tight pressure gradient with the sharpening coastal trough over the Atlantic waters just offshore the NE FL coast. The strong NE flow will produce sustained winds of 20-30 mph with gusts of 35-45 mph along the Atlantic Coastal counties, with strongest winds at the beachfront locations and Wind Advisory will remain in effect. Over inland locations breezy NE winds will continue with sustained winds around 15 mph with gusts to around 30 mph at times. The low level convergence in the NE flow and mid/upper level lift along with PWATs (Precipitable Waters) approaching 2 inches will continue to ramp up rainfall chances with widespread showers and scattered storms for the Atlantic Coastal counties and I-95 corridor with locally heavy rainfall, especially where stationary convergent rain bands can set up and while recent rainfall amounts have been sparse, still can't rule out the need of a short-fuse Flood Watch depending on where the heavy rainfall sets up. Further inland, expect scattered to numerous showers and isolated storms with some heavy downpours but flooding risk is lower over inland areas, since any heavy rainfall that falls along the Atlantic Coastal areas may also see an enhanced flooding risk due to the above normal tidal values during times of high tide, which may also bring about flash flood potential in urban centers through the upcoming weekend. The N-NE flow will bring down some cooler temps over inland areas with lows falling to around 60F over inland SE GA, 65-70F range over inland NE FL/Coastal SE GA, lower 70s along the NE FL coast. .SHORT TERM... (Friday through Saturday night) Issued at 1223pm EDT Thu Oct 9 2025 Strong high pressure will be to the north northeast on Friday, as an area of low pressure develops off the east coast of central FL. With this pattern, winds will remain elevated across the area. The high to the north will weaken Friday night into Saturday, allowing the low pressure area to move north, placing it to the northeast of the region by Saturday afternoon. The low will move up along the Carolina coast Saturday night, with a trough trailing from it into South FL, as a weaker ridge extends inland from high pressure to the north. With this pattern winds will remain elevated and gusty across the area through Saturday, with highs winds along the coast. As the low pulls away, and the high builds Saturday night, inland winds will subside, as the coast still remains gusty. Precipitation chances will be across the whole forecast area on Friday due to the proximity of low pressure, with greatest chances near the coast. These chances will then gradually decrease Friday night through Saturday, as the low tracks away. Temperatures will trend below normal during the days, and near during the nigheights this period. Long Term (Sunday through next Thursday) Issued at 1223pm EDT Thu Oct 9 2025 As weak high pressure builds across the area Sunday, a trough will extend down the east coast from the low over the northeastern US. Subsidence under the ridge should provide for a mainly clear and dry day Sunday. There could be lingering clouds though along east coast due to the trough. With sunshine expected temperatures will moderate to near normal highs. Weak high pressure ridging will remain in place over region through Monday. A trough extending from northeastern low will move southeast across the area Monday night, but a dry passage is expected. There are some discrepancies in longer term guidance for Wednesday into Thursday, with regards to whether troughing leads to precipitation chances. At this time continuing to trend with drier solution. Marine Issued at 1223pm EDT Thu Oct 9 2025 Northeast winds will continue to strengthen as a coastal trough develops over the near shore waters tonight. Showers and embedded storms will begin to increase in coverage through Friday. Gale Warning will remain posted through Saturday night with frequent gusts to gale force are expected. Low pressure will then develop along the frontal boundary over the Gulf Stream waters adjacent to our region on Friday, with this feature gradually strengthening as it moves northward towards the Carolinas this weekend. Strong north-northeasterly winds and building, very rough surf will create dangerous conditions throughout our local waters through early Sunday. Northerly winds will gradually subside late this weekend into early next week, with elevated seas also likely slow to subside across our local waters. Rip Currents High risk of rip currents and high surf advisory conditions will ramp upwards through tonight and continue through the upcoming weekend as surf/breakers build into the 7-10 ft range from Friday onward into the weekend. Severe beach erosion is expected during times of high tide through the upcoming weekend. Hydrology Issued at 1223pm EDT Thu Oct 9 2025 Minor Coastal/Tidal flooding levels are expected through tonight for all NE FL/SE GA beachfront locations and along the St. Johns River Basin as the Northeast flow continue to ramp upwards and will keep Coastal Flood Advisory in place. Will upgrade the Coastal Flood Watch to a Coastal Flood Warning, starting with the late morning high tide cycle on Friday and continuing for each high tide cycle through Saturday Night, and may need to be extended into Sunday, depending on how quickly the winds diminish and shift more offshore late in the weekend. The latest 06Z/12Z PETSS/ETSS guidance still looks a bit too high on the actual peak tidal values of almost 4 feet MHHW on the beachfront and close to 3 feet MHHW on the St. Johns River, but despite the high bias at later time frames, still expect at least Moderate Coastal/Tidal flooding values of close to 3 ft MHHW for NE FL/SE GA beachfront locations (highest since Hurricane Nicole in November 2022) and into the 2.0 to 2.5 ft MHHW range on the St. Johns River Basin (highest since Hurricane Milton from last October). Any heavy rainfall that falls into the St. Johns River Basin during this event will only help exacerbate these values and likely lingering tidal flooding well into next week for the St. Johns River Basin, while the Atlantic beachfront locations should fall back closer to astronomical tidal levels by early next week as the wind flow becomes more offshore. NOAA Jacksonville FL Office: Watches - Warnings - Advisories FL...Coastal Flood Advisory until 10am EDT Friday for FLZ038-124-125- 132-137-138-225-233-325-333-633. Wind Advisory until 5am EDT Sunday for FLZ038-124-125-138-233- 325-333-433-533-633. Coastal Flood Warning from 10am Friday to 6am EDT Sunday for FLZ038-124-125-132-137-138-225-233-325-333-633. High Rip Current Risk through late Saturday night for FLZ124-125- 138-233-333. High Surf Advisory until 6am EDT Sunday for FLZ124-125-138-233- 333. GA...Coastal Flood Advisory until 10am EDT Friday for GAZ154-166. Wind Advisory until 5am EDT Sunday for GAZ154-166. Coastal Flood Warning from 10am Friday to 6am EDT Sunday for GAZ154-166. High Rip Current Risk through late Saturday night for GAZ154-166. High Surf Advisory until 6am EDT Sunday for GAZ154-166. AM...Small Craft Advisory until 2pm EDT this afternoon for AMZ450- 452-454-470-472-474. Gale Warning until 6am EDT Sunday for AMZ450-452-454-470-472- 474. |
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