Altamaha Sound to Fernandina Beach FL Marine Forecast
| Tonight...Southeast Winds 10 To 15 Knots, Diminishing To 5 To 10 Knots After Midnight. Seas 2 To 3 Feet. Wave Detail: East 3 Feet At 9 Seconds And Southeast 2 Feet At 4 Seconds. Intracoastal Waters Becoming Mostly Smooth. |
| Thursday...East Winds 10 To 15 Knots. Seas 2 To 3 Feet. Wave Detail: East 3 Feet At 9 Seconds And Southeast 2 Feet At 5 Seconds. Intracoastal Waters A Light Chop. |
| Thursday Night...East Winds 5 To 10 Knots. Seas 2 To 3 Feet. Wave Detail: East 3 Feet At 9 Seconds And Southeast 2 Feet At 5 Seconds. Intracoastal Waters Mostly Smooth. |
| Friday...East Winds Around 10 Knots. Seas 2 To 3 Feet. Wave Detail: East 3 Feet At 9 Seconds And Southeast 2 Feet At 5 Seconds. Intracoastal Waters A Light Chop. |
| Friday Night And Saturday...Southeast Winds Around 10 Knots. Seas 2 To 3 Feet. Wave Detail: East 3 Feet At 9 Seconds. Intracoastal Waters A Light Chop. |
| Saturday Night...South Winds 5 To 10 Knots, Becoming Southwest After Midnight. Seas 2 To 3 Feet. Wave Detail: East 3 Feet At 9 Seconds. Intracoastal Waters Mostly Smooth. A Slight Chance Of Showers And Thunderstorms In The Evening. |
| Sunday...North Winds 10 To 15 Knots, Becoming Northeast And Increasing To Around 15 Knots During The Afternoon. Seas 3 To 4 Feet, Occasionally To 5 Feet. Intracoastal Waters Becoming A Moderate Chop. A Chance Of Showers With A Slight Chance Of Thunderstorms. |
| Sunday Night And Monday...East Northeast Winds Around 15 Knots. Seas 4 To 5 Feet, Occasionally To 6 Feet. Intracoastal Waters A Moderate Chop. A Chance Of Showers With A Slight Chance Of Thunderstorms. Winds And Waves Higher In And Near Thunderstorms. |
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Area Forecast Discussion National Weather Service Jacksonville FL 254pm EDT Wednesday April 23 2025 ...FEW STRONG TO ISOLATED SEVERE STORMS POSSIBLE THIS EVENING ACROSS INLAND SOUTHEAST GA... ...HOT TEMPERATURES CONTINUE INLAND THROUGH THE WEEKEND... ...BACKDOOR COLD FRONT ARRIVES ON SUNDAY WITH SOME HOPE FOR BENEFICIAL RAINFALL... For the latest NE FL and SE GA Daily Key Messages please visit: https://www.weather.gov/media/jax/briefings/nws-jax-briefing.pdf Synopsis Issued at 254pm EDT Wednesday April 23 2025 Early afternoon surface analysis depicts Atlantic high pressure (1029 millibars) centered to the northeast of Bermuda, with this feature extending its axis southwestward across the FL peninsula. Meanwhile, a weakening frontal boundary was stalling across the Tennessee Valley and the Carolinas. Aloft...ridging has shifted east of the FL peninsula, allowing a more zonal flow pattern developing across the southeastern states. A weak shortwave trough was embedded within this zonal flow pattern across the Deep South, with a stronger shortwave located upstream near the Arklatex region. Multi-layered cloudiness was overhead this afternoon, with a healthy cumulus field inland ahead of the Atlantic sea breeze, while pockets of cirrus and cirrostratus were drifting across our area. Breezy onshore winds for locations east of the I-95 corridor were keeping afternoon temperatures in the upper 70s to around 80, while inland temperatures were climbing to the mid and upper 80s. Dewpoints at inland locations were crashing through the upper 50s and lower 60s as of 19Z, while values in the mid to upper 60s were in place at coastal locations in the wake of the inland moving sea breeze. Near Term (through Tonight) Issued at 254pm EDT Wednesday April 23 2025 Temperatures aloft will cool off through this evening as weak shortwave energy traverses southeast GA. Low level southwesterly flow will increase PWAT (Precipitable Water) values to the 1.25 to 1.5 inch range at inland locations late this afternoon and evening as mid-level temperatures cool to around -15 degrees Celsius at 500 millibars (around 20,000 feet). However, it remains uncertain as to whether the inland moving Atlantic sea breeze will be enough of a trigger for convective development early this evening. Upstream convection over central AL/GA may send outflows southeastward across the Alapaha/Ocmulgee/Altamaha Rivers by around sunset, but short-term, high resolution models continue to indicate only isolated convection developing for locations west and north of Waycross into the early evening hours. The inland moving Atlantic sea breeze may collide with the Gulf coast sea breeze this evening along the I-10 corridor to the west of U.S. Highway 301 to create isolated convection, but higher coverage is expected to remain across interior southeast GA. Although bulk southwesterly shear values around 30-35 knots will be modest, colder mid-level temperatures working into our region later today could cause a few storms to pulse and become strong, mainly for locations west and north of Waycross. Downburst winds of 40-50 mph, small hail, and cloud to ground lightning strikes will be the primary hazards with this activity this evening. Any convection that manages to develop this evening should dissipate by midnight, with patchy to areas of fog possible towards sunrise, mainly for inland southeast GA. Otherwise, high pressure strengthening along the Mid-Atlantic and New England coasts later tonight may provide enough convergence to produce a few coastal showers towards sunrise. Lows tonight will range from the lower 60s inland to the mid and upper 60s at coastal locations, where a light southeasterly breeze will continue overnight and early Thursday morning. .SHORT TERM... (Thursday through Friday night) Issued at 254pm EDT Wednesday April 23 2025 An overall persistent pattern will continue through the short term period, which will feature high pressure in the low levels to the north and east of the region as a backdoor cold front weakens and essentially dissipates to our north. Thursday, the onshore sea breeze progressing inland as well as some possible lingering outflow boundaries from Wednesday Evening/Night convection could be enough for a few showers and thunderstorms to develop, especially over inland southeast GA as plenty of dry air lingers in the mid levels, especially over northeast FL. In addition, a mid level impulse moving across north and central GA Thursday evening will also provide some marginal lift/dynamics for convective initiation where moisture is sufficient. Generally above average temperatures continue Friday, especially away from the coast where mid to upper 80s will be expected and perhaps a few readings in the 90s. Low 80s will be more common east of about I-95. Some convective activity will likely linger Thursday Night as well as mid and high clouds with mild lows in the 60s area- wide. High pressure remains in control Friday, though a fairly strong moisture gradient will persist aloft as the high pressure ridge will be draped across the Florida peninsula. Therefore, southeast GA will once again have the best chance for isolated showers or thunderstorms Friday afternoon and evening, though expecting these chances to be lower than Wednesday and Thursday - generally in the 10% range north of about I-10. Temperature wise will be very similar Friday and Friday Night: Mostly in the mid to upper 80s to near 90 inland and low 80s east of I-95 to the coast, falling mostly into the 60s Friday Night. Long Term (Saturday through next Wednesday) Issued at 254pm EDT Wednesday April 23 2025 High pressure will start to break down on Saturday as a stronger cold front starts to approach from the north, moving across the region Saturday Night and through Sunday and south of the region by Monday and Tuesday. The front will bring increased chances for showers and thunderstorms for most of the region, especially Sunday and into Monday. High pressure wedges down the eastern seaboard Sunday Night and Monday before the associated high moves off the Carolinas and resume its position north and east of the region. This will return a more northeast to southeasterly onshore flow towards the end of the long term period after a weaker flow Saturday and Saturday Night. Temperatures will remain near normal for most of the long term period with the main exception being Monday post cold front in a stronger flow from the northeast to east, quickly starting to moderate again Tuesday with veering flow. Marine Issued at 254pm EDT Wednesday April 23 2025 High pressure building to the north of a stalled front will briefly wedge down the southeastern seaboard on Thursday afternoon, creating breezy onshore winds through Thursday evening. This high pressure center will push offshore of the Mid-Atlantic and New England coasts on Thursday night ahead of a cold front that will move across the southeastern states on Saturday afternoon and evening. This front may bring scattered showers and thunderstorms to our local waters from Saturday night through Monday. Seas of 2 to 4 feet will prevail both near shore and offshore through Saturday night. Strong high pressure building over the Great Lakes states in the wake of this front during the weekend will shift towards the southeastern seaboard early next week, with winds shifting to northeasterly and strengthening across our local waters by Sunday afternoon, with seas expected to gradually build to Caution levels of 4 to 6 feet offshore from Sunday through Monday. Seas near shore will build to the 3-5 foot range. Rip Currents A persistent easterly ocean swell will combine with breezy onshore winds will keep a lower end moderate risk in place at all area beaches through the upcoming weekend. A high risk is possible early next week as onshore winds strengthen and surf becomes increasingly rough. Fire Weather Issued at 1235pm Wednesday April 23 2025 Scattered showers and thunderstorms are expected to develop late this afternoon and early this evening and again on Thursday afternoon and evening across inland portions of southeast GA and possibly northern portions of the Suwannee Valley. Activity should become isolated across these inland locations on Friday afternoon and evening. Otherwise, increasingly hot temperatures at inland locations will drop minimum relative humidity values to the 30-35 percent range for locations west of I-95 corridor this afternoon and again on Thursday afternoon. Breezy easterly surface and transport winds will overspread the I-95 corridor this afternoon, and fair to good daytime dispersion values are forecast area-wide. Breezy easterly surface and transport winds will develop during the late morning hours at coastal locations on Thursday, with these winds spreading inland during the afternoon hours, creating mostly good daytime dispersion values across our region. Elevated mixing heigheights and southeasterly surface and transport winds on Friday will create good daytime dispersion values at most locations on Friday, with marginally high values possible across north central FL. Climate Issued at 1235pm Wednesday April 23 2025 DAILY RECORD HIGHS WED THU FRI SAT SUN JAX 92 (1970) 93 (1999) 92 (1958) 92 (2011) 94 (1986) GNV 92 (1970) 94 (1999) 93 (1896) 93 (1908) 96 (2011) AMG 94 (1968) 93 (1999) 91 (1958) 93 (1986) 96 (1986) CRG 89 (2020) 92 (1999) 91 (2006) 91 (1989) 93 (2011) NOAA Jacksonville FL Office: Watches - Warnings - Advisories FL...None. GA...None. AM...None. |
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