Marine Weather and Tide Forecast for Whitemarsh Island, GA

NEAR TERM /THROUGH TONIGHT/
Today: Expansive subtropical ridging centered over the southwest Gulf will build across the Southeast U.S. today as large high pressure off the North Carolina Outer Banks maintains its influence on the region. The most favorable convective parameters will remain displaced well to the south and southwest.
Modified soundings show a weak subsidence inversion around 800 hPa holding through the day even as dewpoints surge a bit with the passage of the sea breeze later this afternoon. Some weak, surface based instability does develop over interior Southeast Georgia later this afternoon, but with the ridge building aloft, rain-free conditions will prevail. Low-level thickness schemes support highs in the lower-mid 80s across the interior with temperatures across the coastal counties being somewhat muted by a progressive pure sea breeze circulation. The beaches will only peak in the lower-mid 70s.

Tonight: The overall synoptic pattern will change little overnight. The boundary layer should decouple by mid-late evening as the sea breeze decays as it propagates into east- central Georgia, the CSRA and Southern Midlands. Clear skies and calm/light winds will support modest radiational cooling. Lows were trended down slightly as a result, ranging from the mid- upper 50s inland to the upper 60s/near 70 at the beaches and Downtown Charleston.

SHORT TERM /WEDNESDAY THROUGH FRIDAY/
A deep layered ridge will prevail Wednesday through Thursday, then weaken by Friday as a series of shortwaves approaches.
Temps will remain several degrees above normal with inland highs reaching the middle 80s. A robust sea breeze each afternoon will maintain considerably cooler temps along the coast.
Isolated showers and tstms will be possible Friday afternoon as moisture increases and a shortwave drops in from the northwest.

LONG TERM /FRIDAY NIGHT THROUGH MONDAY/
A cold front will drop south into the area Friday night and Saturday, then continue to push south by Sunday while dry high pressure builds from the north. Scattered to numerous showers and tstms expected Friday night and Saturday as the front moves through. Cooler, drier air will move in late weekend into early next week.

AVIATION /06Z TUESDAY THROUGH SATURDAY/
29/06 TAF Discussion: KCHS/KJZI/KSAV: VFR through 06z Wednesday.

Extended Aviation Outlook: Largely VFR. Showers and a few thunderstorms are possible Friday into Saturday and might lead to brief flight restrictions during that time.

MARINE
Through Tonight: There are no concerns. East winds will veer to the southeast this afternoon into tonight as high pressure off the North Carolina Outer Banks maintains its influence on the region. A slight surge in the Charleston Harbor and along the land/sea interface will accompany the pure sea breeze this afternoon, but winds should remain 15 kt or less. Seas 3-5 ft this morning will subside to 2-4 ft later today and linger into tonight.

Wednesday through Sunday: High pressure will prevail Wednesday through Friday, then a cold front will drop through on Saturday.
Conditions expected to remain below advisory levels.

Rip Currents: East to southeasterly flow along with easterly swell of 2 ft every 8 seconds will maintain a moderate rip current risk for all beaches today. A low risk returns for Wednesday.

TIDES/COASTAL FLOODING
Another round of coastal flooding is expected again late this evening across Charleston and Coastal Colleton counties. A Coastal Flood Advisory will likely be needed as tides should breach minor flood thresholds in the Charleston Harbor. Tide levels at Fort Pulaski should remain below minor flood thresholds so no meaningful issues are expected for the remainder of the lower South Carolina coast into coastal Georgia.

CHS WATCHES/WARNINGS/ADVISORIES
GA...None.
SC...None.
MARINE...None.