Altamaha Sound, GA to Fernandina Beach, FL 20 - 60 NM Marine Forecast
| Rest Of Today...Southeast Winds Around 15 Knots. Seas 3 To 5 Feet, Occasionally To 6 Feet. Wave Detail: Southeast 4 Feet At 6 Seconds. |
| Tonight...Southeast Winds 10 To 15 Knots. Seas 3 To 5 Feet, Occasionally To 6 Feet. Wave Detail: Southeast 4 Feet At 8 Seconds. |
| Sunday...Southeast Winds 10 To 15 Knots. Seas 4 To 5 Feet, Occasionally To 6 Feet. Wave Detail: Southeast 4 Feet At 8 Seconds. |
| Sunday Night...Southeast Winds 10 To 15 Knots. Seas 3 To 4 Feet, Occasionally To 5 Feet. Wave Detail: Southeast 4 Feet At 8 Seconds. |
| Monday And Monday Night...South Winds 10 To 15 Knots. Seas 3 To 4 Feet, Occasionally To 5 Feet. Wave Detail: Southeast 4 Feet At 8 Seconds. |
| Tuesday...Southeast Winds 10 To 15 Knots. Seas 3 To 4 Feet, Occasionally To 5 Feet. Wave Detail: Southeast 4 Feet At 8 Seconds And Southeast 2 Feet At 4 Seconds. |
| Wednesday...Southeast Winds 10 To 15 Knots. Seas 3 To 4 Feet, Occasionally To 5 Feet. Wave Detail: Southeast 4 Feet At 8 Seconds And Southeast 2 Feet At 4 Seconds. |
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Area Forecast Discussion National Weather Service Jacksonville FL 117pm EDT Sat April 19 2025 Near Term (through Tonight)... Persistent pattern in place with an upper ridge extended across the region and an axis of high pressure situated laying directly across the area. This will continue a moist southeasterly (onshore) flow today and increase near-ground moisture. This may lead to shallow, patchy fog this morning but an extensive or dense fog is unlikely. Skies will be mostly clear, aside from a scattered afternoon cumulus, offering abundant sunshine and warming temperatures. Highs this afternoon will push into the mid/upper 80s inland and hover the low/mid 80s near the Atlantic coast with the cooling onshore flow. Tonight, no considerable pattern changes except increasing moisture aloft as cirrus begins to slide overhead and across the top of the upper ridge. It appears that the thicker shield of cirrus will remain west through tonight and fill in from west to east after daybreak Sunday. Due to the multiple days of onshore flow, there will be increasing chances for fog and low stratus particularly along the I-95, some of which could be dense. Lows will cool close to near 60 degrees inland while staying more mild at the coast, with readings in the upper 60s to near 70. .SHORT TERM...(Sunday through Monday night) Sunday, deep ridging will be directly over the region as a potent, compact shortwave rides to the north of the ridge aloft eastward from southeast Ontario into Newfoundland by afternoon while another, negatively tilted shortwave trough emerges from the southern Rockies and lifts into the central plains. The deep ridging will keep Atlantic high pressure in control as a ridge axis extends WSW from Bermuda into NE FL and SE GA. The clockwise flow around the high will allow the Atlantic seabreeze to move well inland, but dry conditions under the strong subsidence aloft will preclude any showers, with only high cirrus clouds spilling over the ridge. Highs will reach the upper 80s to near 90 degrees inland, west of US-17 with upper 70s to around 80 at the beaches. Monday, the deep ridge will slowly shift southward into the northern Bahamas to the southeast as the negatively tilted shortwave travels NE across the upper Midwest into the western Great Lakes. Atlantic high pressure axis will remain over the area as the center of the high nudges closer to the area from Bermuda. Onshore southeasterly winds will rise to 10-15 mph along the coast into the St Johns river while staying more southerly 5-10 mph inland. The moist low level airmass under high level clouds will allow for mild, above normal overnight lows Sunday and Monday night into the Long Term (Tuesday through Friday) Tuesday, mid level ridging sinks over the central Bahamas as a result of the shortwave traveling over the ridge across the upper Midwest, through the Great Lakes and into southern Ontario. A frontal boundary will cross the the Appalachian mountains and stall north of the area while the Atlantic high pressure weakens. Wednesday into Friday, the mid to to upper level pattern will become more flattened over the region with weak embedded shortwaves traveling from the WSW across the deep south. This will also deprive the frontal boundary of its ability to press further south and should remain north of the area through the start of next weekend. These impulses will help spur some isolated T'storm development over SE GA areas as Gulf and Atlantic seabreezes merge inland near highway 301 in a weak southerly low level flow regime with just enough moisture as PWAT (Precipitable Water) values of 1.25-1.50 inches pool north of the FL/GA state line, but remain around 1.00 over NE FL, likely preventing any convection or shower development there. High temperatures will warm through the week inland from the upper 80s to the lower 90s by midweek with some mid 90s potentially, helping reach near daily record high values (see climate) into Friday while the coast warms into the low 80s at the beachfront to the mid to upper 80s along I-95 and low 90s just west of US-17. Lows will rise slowly from the low 60s inland into the mid 60s and to the upper 60s at the coast and along the St Johns river. Long Term (Tuesday through Friday) Tuesday, mid level ridging sinks over the central Bahamas as a result of the shortwave traveling over the ridge across the upper Midwest, through the Great Lakes and into southern Ontario. A frontal boundary will cross the the Appalachian mountains and stall north of the area while the Atlantic high pressure weakens. Wednesday into Friday, the mid to to upper level pattern will become more flattened over the region with weak embedded shortwaves traveling from the WSW across the deep south. This will also deprive the frontal boundary of its ability to press further south and should remain north of the area through the start of next weekend. These impulses will help spur some isolated T'storm development over SE GA areas as Gulf and Atlantic seabreezes merge inland near highway 301 in a weak southerly low level flow regime with just enough moisture as PWAT (Precipitable Water) values of 1.25-1.50 inches pool north of the FL/GA state line, but remain around 1.00 over NE FL, likely preventing any convection or shower development there. High temperatures will warm through the week inland from the upper 80s to the lower 90s by midweek with some mid 90s potentially, helping reach near daily record high values (see climate) into Friday while the coast warms into the low 80s at the beachfront to the mid to upper 80s along I-95 and low 90s just west of US-17. Lows will rise slowly from the low 60s inland into the mid 60s and to the upper 60s at the coast and along the St Johns river. Marine A stagnant ridge of high pressure will remain stretched across the region this weekend, continuing southeasterly flow. Small craft exercise caution level winds will develop offshore during the afternoons behind the sea breeze. Next week, a front will stall to the north and local winds will be driven by the sea breeze each afternoon. Headlines are not expected through the next week. Rip Currents Given the increased crowds this holiday weekend coupled with the surf uptick with the enhanced sea breeze, have issued a High Risk for the NE FL beaches. This may be needed on Sunday as well but held at a Moderate Risk. For SE GA beaches, a Moderate Risk continues. Fire Weather Issued at 222am EDT Sat April 19 2025 High pressure will extend west southwest from Bermuda across our area today into Sunday with southeasterly winds 10-15 mph near the coast and winds decreasing to 5-10 mph inland and mostly sunny skies. Min RH values over inland locations west of highway 301 will lower to the 30-35 percent range while higher along the coast. With high mixing heigheights west of US-17 and elevated transport winds, patchy dispersions are expected today and Sunday across inland Northeast Florida. Climate DAILY RECORD HIGHS TUES WED THUR FRI JAX 93 (1995) 92 (1970) 93 (1999) 92 (1958) GNV 94 (1968) 92 (1970) 94 (1999) 93 (1896) AMG 92 (1970) 94 (1968) 93 (1999) 91 (1958) CRG 89 (2002) 89 (2020) 92 (1999) 91 (2006) NOAA Jacksonville FL Office: Watches - Warnings - Advisories FL...High Rip Current Risk through late tonight for FLZ124-125-138- 233-333. GA...None. AM...None. |
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