Altamaha Sound, GA to Fernandina Beach, FL 20 - 60 NM Marine Forecast
| Today...East Winds 20 To 25 Knots. Seas 8 To 9 Feet, Occasionally To 11 Feet. Wave Detail: East 9 Feet At 8 Seconds And East 3 Feet At 13 Seconds. A Chance Of Showers With A Slight Chance Of Thunderstorms. |
| Tonight...East Winds 20 To 25 Knots. Seas 8 To 9 Feet, Occasionally To 11 Feet. Wave Detail: East 9 Feet At 9 Seconds And Southeast 5 Feet At 8 Seconds. A Chance Of Showers With A Slight Chance Of Thunderstorms. |
| Monday...East Winds 20 To 25 Knots, Increasing To 25 To 30 Knots In The Afternoon. Seas 8 To 11 Feet, Occasionally To 14 Feet. Wave Detail: East 11 Feet At 9 Seconds And Southeast 4 Feet At 8 Seconds. Showers Likely With A Chance Of Thunderstorms. |
| Monday Night...East Winds 20 To 25 Knots. Seas 8 To 11 Feet, Occasionally To 14 Feet. Wave Detail: East 10 Feet At 9 Seconds And East 2 Feet At 14 Seconds. A Chance Of Showers And Thunderstorms. |
| Tuesday...East Winds 15 To 20 Knots, Increasing To 20 To 25 Knots In The Afternoon. Seas 7 To 9 Feet, Occasionally To 11 Feet. Wave Detail: East 8 Feet At 8 Seconds And East 2 Feet At 13 Seconds. A Slight Chance Of Showers And Thunderstorms. |
| Tuesday Night...East Winds 15 To 20 Knots. Seas 6 To 8 Feet, Occasionally To 10 Feet. Wave Detail: East 8 Feet At 9 Seconds And Northeast 2 Feet At 7 Seconds. A Slight Chance Of Showers. |
| Wednesday And Wednesday Night...East Winds 15 To 20 Knots. Seas 5 To 6 Feet, Occasionally To 8 Feet. A Slight Chance Of Showers. |
| Thursday...Northeast Winds Increasing To Around 25 Knots. Seas Building To 6 To 8 Feet, Occasionally To 10 Feet. A Slight Chance Of Showers In The Morning, Then A Chance Of Showers With A Slight Chance Of Thunderstorms. Winds And Seas Higher In And Near Thunderstorms. |
| Area Forecast Discussion National Weather Service Jacksonville FL 414am EDT Sunday Oct 5 2025 ...New SYNOPSIS, NEAR TERM, SHORT TERM, LONG TERM, Marine trong>Hydrology .KEY MESSAGES... For the latest NE FL and SE GA Daily Key Messages please visit: https://www.weather.gov/media/jax/briefings/nws-jax-briefing.pdf - Minor to Moderate Tidal Flooding Continues this Week. Coastal Flood Warning: Moderate Tidal Flood impacts within the St. Johns River Basin, Coastal Northeast FL & Intracoastal Waterway. Coastal Flood Advisory: Minor Tidal Flood impacts for Coastal Southeast GA & Nassau Co. - Dangerous Beach & Marine Conditions through Tuesday, Returning Late this Week and Extending into Next Weekend. High Rip Current Risk, High Surf & Small Craft Advisories in Effect through Tuesday. - Locally Heavy Rainfall and Localized Flooding Possible on Monday at Coastal Locations. Synopsis Issued at 414am EDT Sunday Oct 5 2025 Overnight surface analysis depicts gradually weakening high pressure (1025 millibars) now centered just offshore of the Mid- Atlantic coast. This feature continues to wedge down the southeastern seaboard, with a sharp coastal trough remaining positioned over our near shore Atlantic waters to the south of this surface ridge. Meanwhile, weak low pressure (1011 millibars) was moving slowly westward across the northwestern Bahamas, with this feature located along a warm front that was lifting slowly northward across the FL Keys towards south FL. Otherwise, another weak low pressure center (1009 millibars) was situated along this same warm front in the Gulf to the south of coastal Louisiana. Aloft...ridging was positioned over coastal VA and NC, while a cutoff trough was located over the northern Gulf. Latest GOES-East derived Total Precipitable Water imagery indicates that tropical moisture has returned to locations south of the Interstate 10 corridor, where PWATs (Precipitable Waters) have risen to around 2 inches. Meanwhile, PWATs (Precipitable Waters) were closer to early October climatology across southeast GA, where values were generally in the 1.5 - 1.75 inch range. Coastal troughing continues to generate scattered showers over the Atlantic coastal waters that were occasionally moving onshore, with widely scattered light to moderate showers extending inland to the U.S. Highway 301 corridor in southeast GA, while only isolated showers were generally confined to the I-95 corridor in northeast FL. Multi-laytered cloudiness continues to prevail throughout our region, with pockets of low stratus cloudiness expanding in coverage early this morning across inland locations that are along and north of I-10. Temperatures at 08Z ranged from around 70 across inland portions of southeast GA and the Suwannee Valley to the upper 70s along the northeast FL coast. Dewpoints ranged from the mid 60s across inland portions of southeast GA to the mid 70s at coastal locations. Near Term (Today and Tonight) Issued at 414am EDT Sunday Oct 5 2025 Low level flow will veer to southeasterly today in between high pressure situated off the Mid-Atlantic coast and lowering pressures over the Gulf and southeast FL, with coastal troughing remaining in place over our near shore waters. Meanwhile, ridging aloft centered along the Carolina coast will direct the cutoff trough over the northern Gulf slowly northward. This weather pattern will allow for deeper tropical moisture to gradually overspread our area through tonight, with strengthening isentropic lift to the north of a lifting warm front and the presence of persistent coastal troughing resulting in gradually increasing rain chances by this afternoon and evening from south to north. The deeper moisture advecting into our region could allow for a few isolated thunderstorms to develop later today and tonight over the northeast FL Atlantic waters and across north central FL. Brisk low to mid level flow should keep activity moving at a 20-30 mph clip, likely limiting potential for heavy rainfall totals. Onshore surface winds will remain breezy at coastal locations as a tight local pressure gradient remains in place, keeping highs in the low to mid 80s at coastal locations. Lower stratus ceilings expanding early this morning across inland locations will lift by the mid to late morning hours, with breaks in the multi-layered cloud cover allowing inland highs to climb to the mid and upper 80s, with humid conditions this afternoon pushing heat index values to the low and mid 90s across most of north central and northeast FL. Scattered convection over inland north central and northeast FL this afternoon will shift to coastal locations tonight as brisk onshore winds and the persistent coastal trough over our near shore waters continues to generate scattered to numerous fast moving showers. Lower stratus ceilings may once again expand at inland locations during the overnight and predawn hours due to the tropical air mass that will continue to overspread our area. Lows will remain in the 70s area-wide. .SHORT TERM... (Monday through Tuesday night) Issued at 414am EDT Sunday Oct 5 2025 High pressure pushes offshore along the mid Atlantic coast as coastal troughing lingers over the local waters at the start of the new week. Breezy northeasterly-easterly onshore flow will continue to push in showers onshore through the day on Monday with scattered to numerous showers highlighted in the forecast with higher chances over NE FL. Elevated moisture levels with PWATs around the 2" range could see some showers produce heavy downpours which could lead to flooding in low lying and urban locations, which could be problematic if any heavy downpours occurs over locations which are already experiencing ongoing coastal flooding due to the elevated onshore winds. By Tuesday, precipitation chances will start to trend downward as drier air begins to move into the area from the Atlantic as the high pressure continues to move off into the Atlantic and the coastal trough flattens. Enough lingering moisture will still bring about isolated to scattered showers with higher chances along the coast and inland NE FL, but chances of precipitation will continue to trend downward through the overnight hours Tuesday Night. Daytime highs will be in 80s with warmer temps away from the coast, slightly warmer temps on Tuesday. Overnight lows in the 70s with warmer temps along coastal locations Monday Night. Tuesday Night, upper 60s over inland SE GA and the Suwannee Valley Region of NE FL, lower 70s along the coast and inland locations of NE FL aside from the Suwannee Valley Region. Long Term (Wednesday through Saturday) Issued at 414am EDT Sunday Oct 5 2025 Dry air will continue to limit the amount of precipitation across the area midweek, with isolated to scattered chances for the southern and coastal locations of NE FL. By Thursday, an approaching frontal boundary will begin to shift over the northern portions of SE GA. Northeast onshore flow begins to ramp up once again ahead of the frontal boundary. As this will still coincide with the Full Moon and higher tides, the onshore northeasterly flow will likely continue the risk of coastal hazards of rip currents, coastal flooding, dangerous maritime boating conditions, and rough surf during the back half of the upcoming week and next weekend. Marine Issued at 414am EDT Sunday Oct 5 2025 High pressure centered along the Mid-Atlantic coast will continue to wedge down the southeastern seaboard, while coastal troughing remains situated over our near shore waters through Tuesday. Gusty easterly winds and Small Craft Advisory conditions featuring rough, elevated seas will continue across our local waters through Tuesday. Seas of 6-9 feet through tonight will build to 7-11 feet on Monday and Monday night as easterly winds increase to 20-30 knots. Meanwhile, waves of showers and a few embedded thunderstorms will increase in coverage by Sunday night and Monday as weak low pressure traversing the Bahamas moves towards southeast Florida. High pressure will then shift further offshore of the Mid-Atlantic coast by Tuesday night and Wednesday, allowing coastal troughing to weaken over our local waters. Onshore winds and seas will gradually subside, briefly falling back to Caution levels of 15-20 knots and 4-6 foot seas on Wednesday and Wednesday night. A cold front entering the southeastern states on Wednesday will then shift slowly southward across our local waters by Thursday night and Friday. Strong northeasterly winds will redevelop late this week as another high pressure center building over New England wedges down the southeastern seaboard. Hydrology Issued at 414am EDT Sunday Oct 5 2025 Persistent onshore winds will continue to "trap" tides within the St. Johns River basin, with an increasingly astronomical influence to local tides this week due to Tuesday's "Harvest" Full Moon, with minor to moderate tidal flooding continuing throughout the upcoming week. Coastal Flood Warning: includes the St. Johns River Basin, Intracoastal Waterway (ICWW) and the northeast FL coast from Mayport to Flagler Beach. Tidal levels will continue to crest generally between 2 to 2.5 ft above Mean Higher High Water (MHHW) within the St. Johns River basin, with values around 2 feet above MHHW and along the Atlantic coast south of Mayport and within the ICCW. Moderate tidal flooding impacts include flooding of low- lying roads and water surrounding some vulnerable structures. Coastal Flood Advisory: includes coastal Nassau County and coastal southeast GA. Water levels of 1.5 - 2 feet above MHHW around times of high tide will mainly cause minor tidal flooding impacts, including flooding of some boat ramps, docks, over-topping of bulkheads and some tidal-prone roads in low-lying areas. This will be and extended duration coastal / tidal flood event, as astronomical tides will not peak until the mid to late part of next week. With brisk onshore flow continuing through Monday and then potentially re-strengthening late next week, we can expect Coastal Flood Advisories / Watches / Warnings to continue into next weekend for the St. Johns River basin and possibly along portions of coastal northeast FL. NOAA Jacksonville FL Office: Watches - Warnings - Advisories FL...Coastal Flood Advisory until 5pm EDT Tuesday for FLZ124. High Rip Current Risk through Tuesday afternoon for FLZ124-125- 138-233-333. High Surf Advisory until 5pm EDT Tuesday for FLZ124-125-138-233- 333. Coastal Flood Warning until 5pm EDT Tuesday for FLZ125-132-137- 138-225-233-325-333-633. GA...Coastal Flood Advisory until 5pm EDT Tuesday for GAZ154-166. High Rip Current Risk through Tuesday afternoon for GAZ154-166. AM...Small Craft Advisory until 5pm EDT Tuesday for AMZ450-452-454- 470-472-474. |
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