Fernandina Beach to St. Augustine, FL Out 20 NM Marine Forecast
| Rest Of Tonight...South Winds 15 To 20 Knots, Becoming South Southwest And Diminishing To 10 To 15 Knots Late. Seas 3 To 5 Feet, Occasionally To 6 Feet. Wave Detail: Southeast 4 Feet At 5 Seconds And East 2 Feet At 9 Seconds. Intracoastal Waters Becoming A Light Chop. |
| Thursday...Southwest Winds Around 15 Knots, Becoming Northwest And Increasing To 20 To 25 Knots In The Afternoon. Seas 3 To 4 Feet, Occasionally To 5 Feet. Wave Detail: Southeast 4 Feet At 9 Seconds And South 3 Feet At 6 Seconds. Intracoastal Waters Becoming Rough. Showers And Thunderstorms Likely, Mainly During The Afternoon. A Few Strong Storms Are Possible, With Frequent Lightning Strikes And Briefly Gusty Winds. |
| Thursday Night...North Winds 25 To 30 Knots, Becoming Northeast After Midnight. Occasional Gusts To Gale Force Are Possible. Seas 4 To 6 Feet, Occasionally To 8 Feet, Building To 6 To 8 Feet, Occasionally To 10 Feet After Midnight. Wave Detail: Northeast 6 Feet At 8 Seconds And North 5 Feet At 5 Seconds, Becoming Northeast 8 Feet At 7 Seconds. Intracoastal Waters Very Rough. A Chance Of Showers, Mainly Early In The Evening. |
| Friday...Northeast Winds Around 20 Knots, Diminishing To 10 To 15 Knots In The Afternoon. Seas 5 To 7 Feet, Occasionally To 9 Feet. Wave Detail: Northeast 7 Feet At 8 Seconds. Intracoastal Waters Becoming A Light Chop. A Slight Chance Of Showers During The Afternoon. |
| Friday Night And Saturday...East Northeast Winds 5 To 10 Knots, Increasing To 10 To 15 Knots During The Afternoon. Seas 3 To 5 Feet, Occasionally To 6 Feet. Wave Detail: Northeast 5 Feet At 8 Seconds. Intracoastal Waters A Light Chop. A Slight Chance Of Showers. |
| Saturday Night...East Southeast Winds Around 10 Knots. Seas 2 To 4 Feet, Occasionally To 5 Feet. Wave Detail: East 4 Feet At 8 Seconds. Intracoastal Waters A Light Chop. A Slight Chance Of Showers And Thunderstorms In The Evening, Then A Chance Of Showers And Thunderstorms After Midnight. |
| Sunday...South Southeast Winds 10 To 15 Knots. Seas 2 To 4 Feet, Occasionally To 5 Feet. Intracoastal Waters A Light Chop. Showers Likely With A Chance Of Thunderstorms. |
| Sunday Night And Monday...South Winds 15 To 20 Knots, Becoming Southwest Around 15 Knots During The Afternoon. Seas 3 To 4 Feet, Occasionally To 5 Feet. Intracoastal Waters A Moderate Chop. Showers And Thunderstorms Likely. Winds And Waves Higher In And Near Thunderstorms. |
| Area Forecast Discussion National Weather Service Jacksonville FL 839pm EDT Wednesday Mar 11 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 thunderstorms on Thursday. Isolated severe storms are possible for inland southeast GA on Thursday morning, with wind gusts of 40-60 mph and small hail possible. Strong storms are possible elsewhere, with frequent lightning and wind gusts of 40-50 mph possible. Beneficial rainfall expected area-wide (0.25 - 1 inch with locally higher totals possible). - Small craft advisory conditions from late Thursday afternoon through Friday morning. Gale force wind gusts possible on Thursday night. - Beneficial rainfall and strong storms possible on Sunday and Monday. - Frost possible for inland Southeast GA on Tuesday night and early Wednesday morning. Near Term - Through Thursday Night Main Highligheights through Tonight: - Potential for strong to isolated severe thunderstorms Thursday, mainly across southeast GA. Low level flow will continue to increase into tonight as the next cold front will be approaching the region, moving to a line from eastern GA to the western FL panhandle by about 7am Thursday. Latest guidance from HRRR, NSSL, and NAM show precipitation still west of of our forecast area by 7am Thursday. Therefore, we don't anticipate any precipitation to the area until daytime Thursday so no POPs tonight. The main forecast issue will be patchy to areas of fog that may develop across the western zones late tonight and early Thursday. This fog may not be much of a visibility problem and rather just low stratus layer given that winds just a couple hundred feet up may be around 10-12 kt. This should limit the dense fog potential. Lows will fall into the mid 60s. Showers and storms associated with an incoming front will begin just after daybreak Thursday for southeast Georgia, quickly progressing and expanding southeastward through the day. Rain chances are high area-wide, with scattered thunderstorms expected. By sunset, most of the convection will exit the area, with some activity lingering near coastal northeast Florida through midnight. Can't rule out a couple strong thunderstorms (especially in the morning over inland southeast Georgia) with gusty winds as the primary hazard given decent shear, but instability will struggle. There will be a large range of of high temperatures due to the front's passage on Thursday, with inland southeast Georgia staying in the 70s, and Flagler county rising into the upper 80s. Lows Thursday night will be a bit cooler than this past week, with inland southeast Georgia dipping into the lower to mid 40s. Short Term - Friday Through Saturday Night Friday will be mostly dry, with rain chances at about 15-20% for portions of northeast Florida south of St. Augustine as an inverted trough develops near the Atlantic coast. Temperatures Friday will be a little cooler behind the front, but still impressively at or above normal in the 70s to low 80s. Shower chances remain over northeast Florida Saturday as the aforementioned front dissipated over central Florida. Onshore winds Saturday will keep coastal highs in the mid to upper 70s, with 80s inland. Long Term - Sunday Through Wednesday Main Highligheights This Period: - Increased thunderstorm chances Sunday into Monday By Sunday, another front will approach from the northwest, bringing numerous showers and storms Sunday through Monday night. Temperatures will warm up further on Sunday ahead of the front with the help of southerly winds. Much cooler temperatures are expected Monday night through Wednesday, with highs Tuesday staying in the upper 50s to mid 60s. Low temperatures at this time will remain above light freeze concerns, but frost may be possible for inland portions of southeast GA late on Tuesday night and early on Wednesday morning, where lows could fall to the mid and upper 30s. Lows elsewhere should fall to the 40s. Marine South and southwest winds will increase through tonight as a cold front moves to a line from north Georgia to the west Florida panhandle. Winds increase tonight and reach exercise caution levels. The cold front will move into the area waters by midday Thursday, accompanied by showers and a few thunderstorms. Strengthening northwest and north winds expected in the wake of this frontal passage and will create Small Craft Advisory conditions with gale force gusts throughout our local waters by late Thursday afternoon, with these conditions continuing on Thursday night through late Friday morning as high pressure briefly builds over the Mid-Atlantic states. Winds will quickly shift to the northeast Thursday night and speeds gradually diminish on Friday afternoon and evening. The front will move back north as a warm front Saturday night into Sunday morning. Another cold front is expected Monday. Rip Currents A moderate risk expected on Thursday due to mostly offshore flow and generally weak easterly swells. Fire Weather - Areas Of High Dispersions Thursday A line of showers and thunderstorms will move through beginning Thursday morning and continue into the afternoon/evening hours. An isolated strong thunderstorm will be possible with this line mainly in the morning hours in inland southeast GA. Southwesterly winds increase on Thursday ahead of the front resulting in areas of high dispersions across northeast Florida mainly along the St Johns river basin. Friday into Saturday, high pressure will build just north of the region as the cold front exits to the south with drier conditions. Min RHs will drop to 30-35 percent over inland portions of Southeast Georgia on Saturday. FOG POTENTIAL AND OTHER REMARKS: Patchy fog near the I-75 corridor is possible late tonight into early Thursday morning. NOAA Jacksonville FL Office: Watches - Warnings - Advisories FL...High Risk for Rip Currents until 4am EDT Thursday for FLZ124-125- 138-233-333. GA...High Risk for Rip Currents until 4am EDT Thursday for GAZ154-166. Marine Small Craft Advisory from 4pm Thursday to 11am EDT Friday for AMZ450-452-454. Small Craft Advisory from 4pm Thursday to 6pm EDT Friday for AMZ470-472-474. |
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