Altamaha Sound to Fernandina Beach FL Marine Forecast
| Rest Of Tonight...East Winds Around 5 Knots, Becoming West After Midnight. Waves 1 Foot Or Less. Intracoastal Waters Smooth. Areas Of Fog This Evening. Widespread Dense Fog Developing After Midnight. |
| Friday...West Winds Around 5 Knots, Becoming Southeast 5 To 10 Knots In The Afternoon. Waves 1 Foot Or Less. Intracoastal Waters Mostly Smooth. Widespread Dense Fog In The Morning. |
| Friday Night...South Winds 5 To 10 Knots, Becoming Southwest After Midnight. Seas Around 2 Feet. Intracoastal Waters Mostly Smooth. |
| Saturday...Southwest Winds 5 To 10 Knots. Seas Around 2 Feet. Intracoastal Waters Mostly Smooth. |
| Saturday Night...West Winds 10 To 15 Knots, Becoming Northwest After Midnight. Seas Around 2 Feet. Intracoastal Waters A Light Chop. |
| Sunday...Northwest Winds Around 10 Knots, Becoming Northeast 10 To 15 Knots During The Afternoon. Seas Around 2 Feet. Wave Detail: Northeast 2 Feet At 7 Seconds. Intracoastal Waters A Light Chop. |
| Sunday Night And Monday...Northeast Winds 10 To 15 Knots, Becoming East Northeast During The Afternoon. Seas Around 2 Feet. Wave Detail: Northeast 2 Feet At 7 Seconds. Intracoastal Waters A Light Chop. |
| Monday Night...East Winds 10 To 15 Knots, Becoming Southeast Around 10 Knots After Midnight. Seas 2 To 3 Feet. Intracoastal Waters A Light Chop. |
| Tuesday...South Winds 5 To 10 Knots, Becoming Southeast 10 To 15 Knots During The Afternoon. Seas 2 To 3 Feet. Intracoastal Waters A Light Chop. |
| Area Forecast Discussion National Weather Service Jacksonville FL 923pm EST Thu Nov 20 2025 .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 - Dense Fog Possible Late Tonight and Early Friday Morning. Areas Potentially Impacted: Southeast GA, I-95 & U.S.-301 Corridors in Northeast & North Central FL. Additional Rounds of Morning Fog Likely at Inland Locations this Weekend. - Near Record Warmth Continues at Inland Locations into Next Week. - Extended Dry Spell Continues through Early Next Week. Severe to Extreme Drought Expanding Across Inland Southeast GA & the Suwannee Valley. Evening surface analysis depicts slowly weakening high pressure (1019 millibars) centered along the FL Nature Coast, or just north of Tampa Bay. Meanwhile, a weak frontal boundary has wedged southward down the Carolina coast to the Savannah River Valley due to another high pressure center (1023 millibars) positioned along the Mid-Atlantic coast and New England. Aloft...stout ridging extends across the southern Gulf and the FL peninsula. Otherwise, a potent shortwave trough was becoming negatively tilted as it pivots across the southern Rockies towards the southern Plains states. Latest GOES-East derived Total Precipitable Water imagery indicates that a seasonably dry airmass remains entrenched across our region, with PWATs (Precipitable Waters) uniformly around 1 inch. Ridging over the Gulf and FL peninsula was keeping deep west-northwesterly flow in place across our region, with thin cirrus traversing inland southeast GA and fair skies in place elsewhere. Temperatures and dewpoints at 02Z generally ranged from the upper 50s to the mid 60s across our area. Fair skies and diminishing winds will allow for temperatures and dewpoints to fall to the 55-60 range overnight, setting the stage for fog and low stratus clouds to expand across much of our region by the predawn and early morning hours on Friday. HRRR (High-Resolution Rapid Refresh) and SREF guidance both favor dense fog development after midnight initially along the I-95 corridor in southeast GA, with dense fog then gradually expanding south and southwestward across the rest of southeast GA and then along the I-95 corridor in northeast FL by the predawn hours. Dense fog and low stratus ceilings should reach the U.S. Highway 301 corridor in northeast and north central FL. Deep west-northwesterly flow should advect thin, high altitude cirrus cloud cover over the Suwannee Valley and portions of inland southeast GA by the predawn and early morning hours, which may ultimately limit dense fog and low stratus cloud formation along the I-75 corridor later tonight. However, patchy to areas of radiation fog may still develop in these areas during the predawn and early morning hours given the strongly subsident environment in place. Near Term - Through Friday Weak high pressure ridge will be over the region Tonight. Dewpoints over the coastal waters will rise to levels that will be at or above the water temperature. This setup will lead to fog development after sunset along the coast, with this fog spreading inland through the night. Beach front communities could have low visibilities beginning as early as sunset. Dense fog advisories may become necessary, especially for coastal counties. Lows will trend above seasonal averages Tonight. Short Term - Friday Night Through Saturday Night High pressure over the area begins to shift away from the FL peninsula on Friday as a frontal boundary begins to push towards the southeastern CONUS. The frontal boundary pushes into the area on Saturday. Lingering fog along coastal locations will begin to lift and clear by the mid morning hours on Friday. The persistent southwesterly flow ahead of the front will continue to bring in moisture from the and warmer temperatures across the area on Friday. There will be an increase in cloud cover compared to the past couple of days. Friday daytime highs will again reach into the low and mid 80s across inland locations, while upper 70s along the coast as a weak sea breeze develops during the afternoon hours. Overnight lows in the mid to upper 50s across inland locations and the lower 60s along the coast. Another night of patchy to areas of fog will be in Friday night as lingering moisture from the Gulf will allow for some fog to develop along the I-75 corridor during the early predawn hours on Saturday, with some locally dense fog. Southwest winds will steadily shift to be northwesterly during the overnight hours into Sunday. A similar spread of daytime temperatures compared to Friday with highs in the lower to mid 80s. With the cold front pushing through, overnight lows will be cooler across SE GA locations with lows in the mid to upper 50s and lows in the lower 60s across NE FL. Long Term - Sunday Through Thursday Frontal boundary will clear the area on Sunday. Winds shift to become northeasterly behind the front. Highs on Sunday will mostly be in the upper 70s for most locations, with lower 80s along the I- 75 corridor. The northeast to easterly onshore flow will shift to become southwest-southerly during the start of the next week as high pressure centered over the Carolinas extends south towards the southeast CONUS. Guidance is indicating the next frontal boundary to arrive towards the local area by midweek of the upcoming week as the high pressure moves off towards the Atlantic sometime on Tuesday. This front could bring some showers over SE GA and south towards locations along the I-10 corridor in NE FL Wednesday morning. Otherwise, fog development will continue to be of concern during the upcoming week as moisture continues to be brought into the area due to the southerly flow. Marine Weakening high pressure will continue to shift slowly east- southeastward across the Florida peninsula through Saturday. Dense sea fog is expected to develop overnight across the Georgia waters, with this fog potentially extending to the near shore waters adjacent to northeast Florida on Friday morning before dissipating by early afternoon. A weakening and mostly dry frontal boundary will then push southward through the Georgia waters on Saturday night, with this boundary pushing across the northeast FL waters early on Sunday morning. High pressure will build eastward from the Ozarks on Sunday towards the Mid-Atlantic states by Monday afternoon, with breezy onshore winds developing across our local waters from Sunday afternoon through Monday afternoon. A stronger cold front may then push eastward across the southeastern states on Wednesday and Wednesday night, with southerly winds expected to develop ahead of this front beginning on Tuesday evening. Fire Weather Persistent weather pattern of dry, warm temperatures, and rising afternoon humidity into the upcoming weekend as the drought continues. Lingering low level moisture from the Gulf will continue to bring the potential for morning fog, with some locations with dense fog. Poor afternoon dispersions will also be in play as minimal surface and transport winds remain Friday and Saturday. Breezy southwesterly winds will start to increase with gusts up to 15 mph across southeast GA on Friday afternoon as a weak cold front slowly approaches from the northwest. Breezy southwesterly winds will spread across the entire area Saturday as the aforementioned front pushes into and through the region overnight Saturday into Sunday. Northeasterly winds behind the front Sunday will trend easterly by Monday. Another cold front will pass through the area during the middle of next week which may offer breezy winds and low relative humidity in its wake. Climate Record High Temperatures through Saturday, November 22: Friday, November 21: KJAX: 84/1991 KGNV: 86/1973 KAMG: 83/2011 KCRG: 82/2004 Saturday, November 22: KJAX: 84/1973 KGNV: 86/1906 KAMG: 83/2011 KCRG: 81/1997. NOAA Jacksonville FL Office: Watches - Warnings - Advisories FL...None. GA...None. Marine None. |
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