Marine Weather Net

Altamaha Sound to Fernandina Beach FL Marine Forecast


TODAY

WNW
WINDS
5 - 10
KNOTS

TONIGHT

SW
WINDS
10
KNOTS

WEDNESDAY

NW
WINDS
5 - 10
KNOTS

WEDNESDAY NIGHT

SE
WINDS
5 - 10
KNOTS

The Marine Weather Forecast In Detail:
AMZ450 Forecast Issued: 218 AM EDT Tue Jul 14 2020

Today...West Northwest Winds 5 To 10 Knots Becoming South Southeast In The Afternoon. Seas 1 To 2 Feet. Dominant Period 8 Seconds. Inland Waters A Light Chop. A Chance Of Showers And Thunderstorms.
Tonight...South Southwest Winds Around 10 Knots Becoming West After Midnight. Seas 1 To 2 Feet. Dominant Period 8 Seconds. Inland Waters A Light Chop. A Slight Chance Of Showers And Thunderstorms.
Wednesday...Northwest Winds 5 To 10 Knots Becoming East Southeast In The Afternoon. Seas 1 To 2 Feet. Dominant Period 8 Seconds. Inland Waters A Light Chop.
Wednesday Night...Southeast Winds 5 To 10 Knots. Seas 1 To 2 Feet. Dominant Period 8 Seconds. Inland Waters A Light Chop.
Thursday...East Winds 10 To 15 Knots. Seas 1 To 2 Feet. Dominant Period 8 Seconds. Inland Waters A Light Chop.
Thursday Night...East Southeast Winds 10 To 15 Knots. Seas 2 To 3 Feet. Showers And Thunderstorms Likely.
Friday...East Southeast Winds 10 To 15 Knots. Seas 2 To 3 Feet. Showers And Thunderstorms Likely.
Saturday...East Southeast Winds 10 To 15 Knots. Seas 2 To 3 Feet. Showers And Thunderstorms Likely.
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AMZ400: Synopsis for Altamaha Sound GA to Flagler Beach FL out to 60 nm
218 AM EDT Tue Jul 14 2020

Weak troughing will remain situated just north of the Georgia waters through midweek, resulting in prevailing offshore winds during the overnight and morning hours that will shift to onshore during the afternoon. Scattered showers and thunderstorms will be possible through midweek, especially during the afternoon and evening hours in the near shore waters. High pressure will then build over the Canadian Maritime region late this week and will slowly expand down the southeastern seaboard, shifting winds to a prevailing onshore direction through the weekend. An easterly wave may cross our local waters on Saturday, potentially increasing shower and thunderstorm coverage throughout our local waters.

Gulf Stream
The approximate location of the west wall of the Gulf Stream as of Jul 14, 2020 at 1200 UTC...
- 59 nautical miles east of Flagler Beach.
- 72 nautical miles east southeast of Saint Augustine Beach.
- 67 nautical miles east northeast of Jacksonville Beach.
- 71 nautical miles east southeast of St Simons Island.
Area Forecast Discussion
National Weather Service Jacksonville FL
720am EDT Tuesday July 14 2020

Near Term - Through Tonight
Predominantly south-southwesterly flow today with scattered showers and thunderstorms building throughout the day, largely in conjunction with the advancing sea breeze as it progresses towards the east. A sea breeze collision is possible in the late afternoon, occuring near the eastern coastline and east of the I-95 corridor. Most of the convection is expected to disperse in the evening with a possibility of lingering convection over inland Georgia later in the evening. High temperatures for the day are expected to be in the mid to upper 90s with heat index values ranging between 100 - 110 degrees. Overnight low temperatures are expected to be in the mid and upper 70s.

.SHORT TERM [Wednesday Through Thursday]... Models are struggling with transition to a more onshore easterly steering flow pattern as High Pressure builds NE of the region over the Carolinas, with main diffs being the amount of deep moisture over the region as the GFS model is much drier than the ECMWF (European Centre for Medium-Range Weather Forecasts) by the Thu afternoon time frame. Medium confidence in at least scattered showers and storms over mainly inland areas on Wednesday afternoon and evening with Hot and Humid conds continuing and Highs in the lower to middle 90s and Heat Indices around 105 degrees. Lower confidence in Thursday afternoon forecast as current scattered showers and storms over inland areas could be even less than expected as drier airmass aloft builds in from the NE and expect the onshore easterly flow to keep the Atlc Coastal areas mainly dry with Max Temps slightly cooler around 90 degrees along the I-95 corridor with lower to middle 90s pushed further inland.

Long Term - Friday Through Tuesday
Longer range models suggesting a return to a wetter pattern, especially across NE FL as mid/upper level trough over the Bahamas will push westward into the FL Peninsula on Fri/Sat with deep moisture and a return to more numerous showers/storms across NE FL with lesser convection over SE GA. Temps will be closer to normal values with Highs mainly in the lower 90s. The mid/upper level trough and moisture will track into the Gulf of Mexico for Sun/Mon with a slight reduction in rainfall chances but at least climo/scattered type afternoon showers/storms will continue with the best chances over inland areas as steering flow remains out of the East/Southeast as weak High Pressure ridge axis remains just north of the area across South GA. Temps continue near normal levels through the period.

Marine
Weak troughing will remain situated just north of the Georgia waters through midweek, resulting in prevailing offshore winds during the overnight and morning hours that will shift to onshore during the afternoon. Scattered showers and thunderstorms will be possible through midweek, especially during the afternoon and evening hours in the near shore waters. High pressure will then build over the Canadian Maritime region late this week and will slowly expand down the southeastern seaboard, shifting winds to a prevailing onshore direction through the weekend. An easterly wave may cross our local waters on Saturday, potentially increasing shower and thunderstorm coverage throughout our local waters.

Rip Currents
Mild Risk

Fire Weather
A slightly more moist southwest flow is expected today with a return to scattered afternoon showers and thunderstorms and continued hot and humid conditions with highs into the 90s and heat indices over 100 degrees. Surface flow becomes more southerly on Wednesday with local southeast sea breeze along the Atlantic Coast and expected scattered to possibly numerous showers and storms to continue. Humidities will remain above critical values.

NOAA Jacksonville FL Office: Watches - Warnings - Advisories
FL...None. GA...None. AM...None.