Fernandina Beach to St. Augustine, FL Out 20 NM Marine Forecast
| Rest Of Tonight...South Winds Around 5 Knots. Seas Around 2 Feet. Intracoastal Waters Smooth. |
| Wednesday...South Winds 5 To 10 Knots. Seas Around 2 Feet. Wave Detail: Southeast 2 Feet At 4 Seconds. Intracoastal Waters Light Chop. A Slight Chance Of Showers And Thunderstorms In The Morning, Then A Chance Of Showers And Thunderstorms In The Afternoon. |
| Wednesday Night...South Winds 10 To 15 Knots. Seas Around 2 Feet. Wave Detail: Southeast 2 Feet At 4 Seconds. Intracoastal Waters A Moderate Chop. A Slight Chance Of Showers And Thunderstorms In The Evening. |
| Thursday...South Winds 5 To 10 Knots, Becoming Southeast 10 To 15 Knots In The Afternoon. Seas 2 To 3 Feet. Wave Detail: Southeast 2 Feet At 4 Seconds. Intracoastal Waters A Moderate Chop. A Chance Of Showers And Thunderstorms In The Afternoon. |
| Thursday Night...South Winds 10 To 15 Knots, Becoming Southwest 5 To 10 Knots After Midnight. Seas 2 To 3 Feet. Wave Detail: Southeast 3 Feet At 4 Seconds. Intracoastal Waters A Moderate Chop. A Chance Of Showers And Thunderstorms, Mainly In The Evening. |
| Friday...South Winds 5 To 10 Knots, Becoming Southeast 10 To 15 Knots In The Afternoon. Seas 2 To 3 Feet. Wave Detail: Southeast 2 Feet At 5 Seconds. Intracoastal Waters A Moderate Chop. A Chance Of Showers And Thunderstorms In The Afternoon. |
| Friday Night...South Winds 10 To 15 Knots, Diminishing To 5 To 10 Knots After Midnight. Seas 2 To 3 Feet. Intracoastal Waters A Moderate Chop. A Chance Of Thunderstorms. Showers Likely, Mainly In The Evening. |
| Saturday...East Winds 5 To 10 Knots. Seas Around 2 Feet. Intracoastal Waters Light Chop. A Chance Of Showers And Thunderstorms. Winds And Waves Higher In And Near Thunderstorms. |
| Sunday...East Winds 5 To 10 Knots. Seas Around 2 Feet. Intracoastal Waters Light Chop. A Chance Of Showers And Thunderstorms. Winds And Waves Higher In And Near Thunderstorms. |
| Area Forecast Discussion National Weather Service Jacksonville FL 235am EDT Wednesday August 26 2026 .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 - Scattered to Numerous Afternoon & Evening TStorms Each Day capable of locally heavy rain and flooding. Isolated strong storms possible. - Moderate Rip Current Risk Continues at All Area Beaches Near Term - Through Tonight Highligheights through Tonight: - Isolated strong thunderstorms with locally gusty winds and heavy downpours is expected across SE GA early this afternoon and along the I-95 corridor during the late afternoon. A wavy stalled frontal zone remains to the north today while troughing exists aloft. Similar to yesterday, a mellow low level steering flow will favor a southwesterly direction through most of the day, which will pin and slow the Atlantic sea breeze as it develops. There appears to be a higher chance of more isolated coverage during the morning and early afternoon hours across eastern and southern zones of NE FL as a wedge of drier air over the eastern Gulf advects northward. Further north, high precipitable water (2"+) will fuel convection across SE GA and the Suwannee River valley early in the day, with thunderstorms developing along the Big Bend and pushing into the Suwannee River during the late morning hours. As more deeper moisture builds and outflows from the west begin to interact with the Atlantic sea breeze during the late afternoon and early evening scattered thunderstorms will develop and likely propagate southwestward as storm- relative inflow trends southerly. With the loss of daytime heating, there will be a quick decline in thunderstorm activity this evening. Primary concerns with today's storm activity will be gusty outflow winds and locally heavy rainfall which may lead to flooding, particularly in low-lying, poor-drainage, or generally flood-prone locations. Temperatures will have more time to heat up today, especially across NE FL and North Central FL, with highs pushing into the low 90s. The earlier start to convection for the Suwannee Valley and north into SE GA will limit todays highs to the upper 80s or right at 90 degrees due to the rain-cooled air and mostly cloudy conditions. Overall this will keep heat index in the upper 90s to low 100s this afternoon. A standard mild, muggy night will follow todays typical August heat as temperatures fall to the low 70s. Short Term - Thursday Through Friday Night Main Highligheights This Period: - Chance for a isolated strong to severe storms each afternoon and evening Thursday & Friday Summertime pattern for diurnal bouts of showers and thunderstorms will continue through the end of the week as a prevailing southwesterly flow remains in place between the frontal zone to the north and high pressure ridging extending over Florida from out of the east. Daytime high temperatures will be in the lower 90s for inland areas on Thursday and Friday, with max temps in the upper 80s and lower 90s along the coast. Overnight low temperatures will drop down into the lower 70s over inland areas and in the mid 70s for areas along the coast and near the St Johns River. Heat index values will rise to be over 100 during this period with a potential for some areas to reach heat advisory levels on Wednesday. The passage of upper level short waves through this period could lead to stronger thunderstorm developments in the afternoon and evening hours. Long Term - Saturday Through Tuesday Main Highligheights This Period: - Chances For Isolated Strong to Severe Storms Continues Each Afternoon and Evening Prevailing flow will shift about to become more out of the southwest and west by the end of the weekend and into next week as the frontal zone to the north becomes less defined and high pressure builds in closer to the southeast US. Otherwise, the pattern for diurnal showers and storms will remain fairly consistent through the period with the potential for stronger storms occurring with possible passing upper level short waves. Temperatures will trend slightly above average through the weekend and into the beginning of next week with daily high temperatures reaching into the lower 90s. Heat index values will rise to be over 100 during this period but are expected to remain below heat advisory criteria each day. Marine A stalled frontal boundary positioned just north of the Georgia waters will remain in place during the next several days. Thunderstorms developing over coastal locations will push across our local waters through the upcoming weekend, mainly during the late afternoon and evening hours, with strong to isolated severe storms possible. Offshore winds will otherwise prevail during the overnight and morning hours, with the Atlantic sea breeze shifting winds to onshore each afternoon across the near shore waters. Southerly winds will then surge each evening, with speeds briefly approaching Caution speeds around sunset outside of ongoing thunderstorm activity. Stronger high pressure building over New England this weekend will shift prevailing winds to onshore across our local waters. Rip Currents Following the sea breeze a lower end Moderate Risk is expected at all area beaches each afternoon during the next through the end of the week. Fire Weather A frontal zone will remain nearly stationary across southern GA through the end of the week, persisting elevated chances for showers and thunderstorms each day, mainly during the daytime hours. Weak high pressure ridging across and just south of the region will keep the flow direction generally out of the south to southwest, with winds peaking during the evening and overnight hours. Another frontal boundary drops southward towards area waters this upcoming weekend, maintaining an active pattern. Fog Potential: Significant fog is unlikely over the next several days. Gusty and erratic winds can be expected in and near thunderstorms. NOAA Jacksonville FL Office: Watches - Warnings - Advisories FL...None. GA...None. Marine None. |
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