Marine Weather and Tide Forecast for St. Marys, GA

SHORT TERM
(Tuesday through Wednesday night)
Issued at 230 PM EDT Mon Apr 28 2025

Easterly winds continue through Tuesday, shifting to south- southeasterly by Wednesday morning as surface high pressure gradually will shift southeastward along the Atlantic coast from the Carolinas. With the easterly flow, the Atlantic sea breeze is expected to push well inland on Tuesday. Chances of showers along the coast during the morning hours will spread westward through the morning hours. Diurnal heating will bring daytime highs for western locations into the mid 80s, with lower 80s expected for locations eastward of the I-75 corridor. Chances of showers and storms will increase by the afternoon hours as the Atlantic sea breeze meets with the Gulf sea breeze between I-75 and US-301.
Most activity will begin to tamper off with the loss of diurnal heating.

Drier air and subsidence will suppress convection on Wednesday with high pressure over the western Atlantic. Daytime highs will follow a similar pattern as Tuesday, warmer temps in the upper 80s for well inland locations, and highs in the lower to mid 80s from the coast towards US-301.

LONG TERM
(Thursday through next Monday)
Issued at 230 PM EDT Mon Apr 28 2025

The high pressure over the western Atlantic will begin to shift towards the east on Thursday ahead of a trough of low pressure digging into the SE CONUS. The associated frontal boundary will begin to cross into SE GA during the overnight hours on Friday to Saturday. Showers and storms will look to develop ahead of the frontal boundary on Friday afternoon over SE GA, then north of the I-10 corridor and coastal locations by Friday evening. The frontal boundary will push south of north central FL by Saturday evening. Diurnal instability, sea breeze interactions, and left over convergence north of the front will result in isolated to scattered showers/storms on Saturday.Temperatures return to above seasonable for the end of the week.

AVIATION
(18Z TAFS)
Issued at 205 PM EDT Mon Apr 28 2025

A lull in the convection at this time, and the cold frontal looks to be near and south of I-10 corridor at 18z. Expect convergence to lead to some VCSH and possibly VCTS for coastal TAF sites through about 23Z/00z, with VQQ possibly get a TSRA at the site.
For inland at GNV, there is a bit better chance of TSRA have maintained a TEMPO group there and just shifted ahead 1 hour in the updated 18z TAF package. Ongoing convection after about 21z is expected to largely be inland northeast FL. During the mid to late evening, only isolated shower or a storm and at most a VCSH is needed at this time. Early Tuesday morning, some chance for low stratus and fog inland areas and at this time showed scattered low deck at GNV and MVFR vsby at VQQ. Mostly VFR cigs Tuesday after 12z with a few showers developing in the 13z-18z time frame for coastal TAF areas.

MARINE
Issued at 230 PM EDT Mon Apr 28 2025

Breezy easterly winds and building seas expected through tonight with some gradual decrease Tuesday to Tuesday night time frame.
Seas peak by tonight at 4-6 ft. Winds and seas are near Small Craft Exercise Caution into Tonight so these headlines continue.
Weakening gradient will support lower winds and seas Wednesday as a high pressure ridge builds in. Winds turn more southeast Wed night into late week as the ridge drops southward with winds down to 10-15 kt and seas near 3-4 ft.

Rip Currents: Building rough surf from easterly winds will support a high risk of rip currents through Tuesday. Probably still looking at a solid moderate risk on Wednesday.

PRELIMINARY POINT TEMPS/POPS
AMG 63 83 60 86 / 10 20 0 0 SSI 69 80 68 81 / 20 20 0 0 JAX 66 82 62 84 / 20 20 0 0 SGJ 69 81 65 81 / 20 20 0 0 GNV 65 85 60 87 / 30 30 0 0 OCF 66 86 61 88 / 30 40 0 0

JAX WATCHES/WARNINGS/ADVISORIES
FL...High Rip Current Risk through late Tuesday night for FLZ124-125- 138-233-333.

GA...High Rip Current Risk through late Tuesday night for GAZ154-166.

AM...None.