Altamaha Sound to Fernandina Beach FL Marine Forecast
| Tonight...West Winds 10 To 15 Knots. Seas 2 To 3 Feet. Wave Detail: Southwest 2 Feet At 4 Seconds. Intracoastal Waters A Moderate Chop. A Chance Of Showers And Thunderstorms This Evening. |
| Thursday...West Winds 10 To 15 Knots, Becoming South 5 To 10 Knots In The Afternoon. Seas 2 To 3 Feet. Wave Detail: West 2 Feet At 4 Seconds. Intracoastal Waters A Moderate Chop. A Slight Chance Of Showers And Thunderstorms In The Afternoon. |
| Thursday Night...Southwest Winds 5 To 10 Knots. Seas Around 2 Feet. Wave Detail: South 2 Feet At 4 Seconds. Intracoastal Waters Light Chop. A Chance Of Showers And Thunderstorms In The Evening. |
| Friday...Southwest Winds 5 To 10 Knots, Becoming Southeast In The Afternoon. Seas Around 2 Feet. Wave Detail: South 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. |
| Friday Night...Southwest Winds 5 To 10 Knots. Seas Around 2 Feet. Wave Detail: South 2 Feet At 3 Seconds. Intracoastal Waters Light Chop. A Chance Of Showers And Thunderstorms In The Evening. |
| Saturday And Saturday Night...Southwest Winds 10 To 15 Knots. Seas 2 To 3 Feet. Wave Detail: South 3 Feet At 5 Seconds. Intracoastal Waters A Moderate Chop. A Chance Of Showers And Thunderstorms. |
| Sunday...South Winds 15 To 20 Knots. Seas 2 To 4 Feet, Occasionally To 5 Feet. Intracoastal Waters Choppy. Showers With Thunderstorms Likely. Winds And Waves Higher In And Near Thunderstorms. |
| Monday...South Winds 15 To 20 Knots. Seas 2 To 4 Feet, Occasionally To 5 Feet. Intracoastal Waters Choppy. Showers With Thunderstorms Likely. Winds And Waves Higher In And Near Thunderstorms. |
| Area Forecast Discussion National Weather Service Jacksonville FL 226pm EDT Wednesday July 29 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 - Dangerously Hot & Humid Weather Continues Today. Extreme Heat Warning & Heat Advisory Today, Heat Indices: 110-115 - Strong to Severe Thunderstorms on This Afternoon and Evening. Damaging Wind Gusts up to 50-70 mph, Frequent Lightning Strikes, and - Localized Flooding Due to Heavy Downpours Possible - Numerous Mainly Afternoon & Evening TStorms through Monday. Daily Rounds of Heavy Downpours Could Result in Localized Flooding Near Term - Through Tonight Main Highligheights ForToday And Tonight - Near Record Heat with Dangerous Heat Indices of 108-115F Today and Extreme Heat Warnings and Heat Advisories are now in effect. - Scattered Severe Storms late this afternoon through tonight with damaging winds of 50-70 mph possible along with heavy downpours and localized flooding Extremely high temperatures building in over the region today followed by storms and showers building in from out of the north ahead of an advancing frontal boundary. Front is expected to stall in the vicinity of southern Georgia and northeast Florida with a moist primarily easterly prevailing flow settling over the forecast area. Showers and storms will develop from west to east today with a potential for stronger storms to become severe and being capable of producing destructive winds, frequent lightning, and potential localized flooding for areas affected by extended periods of rainfall. Lingering convection may continue through the night and on into Thursday morning, with the majority of overnight storm developments occurring south of the I-10 corridor. High temperatures today will reach up into the mid to upper 90s for much of the forecast area with overnight low temperatures dropping into the mid 70s for inland areas and into the upper 70s along the coast. Heat index values will rise upwards into the 110 to 115 range this afternoon. Short Term - Thursday Through Friday Night Main Highligheights This Period: - Rounds of Showers and Thunderstorms, Isolated Strong to Severe Storms Possible - Near Heat Advisory conditions Thursday for Northeast FL & the Coast By Thursday, the cold front will be draped across SE GA, with the majority of showers and storms south across NE FL, with limited chances over SE GA as drier air filters in behind the boundary. Convective activity may begin to develop during the morning to afternoon hours for portions of north central FL, with further development by the afternoon to evening hours closer to stalled boundary over SE GA. Heavy downpours and strong downbursts will again be possible with any showers and storms that develop as there will still be a good amount of moisture aloft south the stalled boundary. Storm Prediction Center currently has a Marginal Risk for Severe Storms for locations along the boundary in SE GA and south of the boundary across NE FL. With the boundary shifting a bit north along the Altamaha River, a similar pattern will be in place once again on Friday with coverage of numerous and widespread showers and storms once again mainly over NE FL, with isolated strong to severe downbursts possible. Temperatures will be a bit cooler on Thursday and Friday, but still will still rise into the lower to mid 90s. While it is close, Heat Index values currently aren't hitting Heat Advisory criteria on Thursday, will hold off on issuing a Heat Advisory for Thursday at this time and will reassess with the next package. Long Term - Saturday Through Wednesday Main Highligheights This Period: - Daily Rounds of Mainly Afternoon and Evening Thunderstorms, Isolated Strong to Severe Storms Possible The pattern looks to remain active for the upcoming weekend and likely into next week as well, as a frontal zone lingers just north of the region and energy from another upper trough affects the southeastern states. This regime as well as abundant moisture each day will support at least numerous showers and t'storms daily, as well as strong downburst and heavy rainfall potential. Temperatures overall trend near to slightly below normal during the long term period given the more active convective pattern. Marine Active weather pattern develops today with a surge of southwest winds to Small Craft Exercise Caution levels which will continue through tonight. A frontal boundary will then sink into the Deep South late this week, with this feature becoming stationary during the weekend. Strong to severe thunderstorms will be possible well in advance of this front this afternoon and evening, with stronger storms potentially producing damaging wind gusts, waterspouts, frequent lightning strikes, and torrential downpours. Scattered to numerous thunderstorms will continue across the northeast Florida waters on Thursday and Friday, with less coverage currently forecast for the Georgia waters. Waves of showers and thunderstorms will then overspread all of our local waters during the upcoming weekend. Outside of expected thunderstorm activity, southwesterly winds will prevail with Caution conditions likely through the upcoming weekend. Rip Currents Low to marginal moderate risk of rip currents is expected through the end of the week at NE FL and SE GA beaches with surf/breakers of only 1-2 feet due to the offshore flow. Fire Weather - Patchy High Daytime Dispersions Inland Through Thursday - Isolated to Widely Scattered Severe Storms Possible Rest of Week A frontal boundary will remain over SE GA through Tonight, with showers and thunderstorms expected to persist into the evening hours. An active pattern looks to persist into this weekend as another frontal boundary approaches the region, with daily showers and storms over the area. Mixing of slightly drier air over interior southeast GA through Friday will drop minRH values to around 35-40%, but above any critical thresholds. Patchy high dispersions will be possible on Thursday over southeast GA. Fog Potential: Significant fog development is not expected during the next several mornings. As mentioned above, isolated to widely scattered strong to severe thunderstorms are possible through the rest of today. Gusts up to 40-60 mph will be possible in these storms as well as erratic winds in/nearby any storms. Climate Daily record high temperatures and record warm minimum temperatures at our designated climate sites on Wednesday: July 29: KJAX: 101/2025 80/1877 KGNV: 100/2025 79/2025 KAMG: 99/2025 77/2017 KCRG: 101/2016 79/2017 NOAA Jacksonville FL Office: Watches - Warnings - Advisories FL...Extreme Heat Warning until 8pm EDT this evening for FLZ021- 023-024-030-031-035-120-124-125-132-136-137-220-225-232- 233-236-237-322-325-333-422-425-433-522-533-633. Heat Advisory until 8pm EDT this evening for FLZ038-138-140- 240-340. GA...Extreme Heat Warning until 8pm EDT this evening for GAZ153- 154-162-163-165-166-264-350-364. Heat Advisory until 8pm EDT this evening for GAZ132>136-149- 151-152-250. Marine None.. |
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