Marine Weather and Tide Forecast for Yemassee, SC

NEAR TERM /THROUGH TONIGHT/
Convection continues to dwindle across the coastal waters, and as of early afternoon, rainfree conditions prevail across land areas. There is still hope for a few showers on the sea breeze and differential heating boundaries, such as the one that is across interior Georgia where temperatures have warmer into the lower 80s. We have tweaked a few high temperatures higher given a bit more sunshine. There sea breeze will continue to enhance the synoptic onshore flow, resulting in gusts of 15 or 20 mph inland, and up to 20 or 25 mph closer to the coast.

Rest to today: The back edge of the widespread convection associated with the MCV are continuing to pull further off the coast, with mainly rainfree conditions across the vast majority of the forecast region. Given NVA aloft in wake of the convection, and the stationary front to the south of the region, the potential for any additional showers and t-storms remains low. We continue to show isolated to scattered PoPs this afternoon, mainly along the sea breeze and leftover boundaries from the previous convection. The best chances are south of I-16 in Georgia where there is deeper moisture and higher Theta-E air aligned with the better upward omega fields. While any rain further north will b isolated, the Charleston Tri-County region will remain rainfree given lower dew point air. With an onshore flow and an early start to the sea breeze courtesy of surface high pressure centered not far from the Great Dismal Swamp, will limit highs to the upper 70s and lower 80s inland, and the mid 70s along the coast.

Tonight: Lingering convection should quickly wane this evening with the loss of insolation. High pressure offshore the North Carolina Outer Banks will maintain its influence on the region overnight. The boundary layer should largely decouple after midnight once the inland moving sea breeze circulation dissipates. This will yield a calm/light wind field under mostly clear skies. The cooler guidance as favored for lows Tuesday morning given the modest radiational cooling expected. Lows will range from the mid 50s well inland to the upper 60s at the beaches. Some lower 50s could occur over the Francis Marion National Forest. Some shallow ground fog could develop early Tuesday morning, but is not expected to yield any meaningful impacts.

SHORT TERM /TUESDAY THROUGH THURSDAY/
Deep layered ridging will prevail Tuesday through Thursday.
Above normal temperatures expected except at the coast where a robust sea breeze each afternoon will keep temps 5-10 degrees cooler. No precipitation anticipated.

LONG TERM /THURSDAY NIGHT THROUGH SUNDAY/
The upper ridge will break down late in the week with a more progressive upper pattern developing into the weekend. A cold front is expected to drop into the area Friday, then stall over the southern part of the area through the weekend. Rain chances will increase considerably, though dry high pressure building from the north over the weekend could push the greatest rain potential into southeast GA, with southern SC mostly dry.
Temperatures will be closer to normal by Saturday.

AVIATION /18Z MONDAY THROUGH SATURDAY/
KCHS/KJZI/KSAV: Vfr will prevail through 29/18Z at all sites.
Gusty easterly winds will continue into early this evening (peaking around 20 kt), before dropping off tonight.

Extended Aviation Outlook: Prevailing VFR.

MARINE
Through Tonight: The pressure gradient over the waters will remain somewhat enhanced, although it will not be as tight as what was observed Sunday. Still expect east winds of 15-20 kt to prevail, with gusts close to 25 kt at times. But not strong enough to raise any Small Craft Advisories. Seas will be up to 3-5 feet throughout. Easterly winds will diminish to 10-15 kt tonight as the pressure gradient relaxes even more with high pressure nosing into the region. Seas will hold in the 3-5 ft range. The heavier and steadier convection will continue to wane, and we show diminishing coverage on the Georgia waters into this afternoon, before it completely ends by tonight.

Tuesday through Saturday: High pressure will prevail Tuesday through Thursday night, then a cold front will drop into the area Friday into the weekend. Winds and seas expected to remain well below advisory levels.

Rip Currents: Breezy conditions and a continued easterly swell of 2 ft every 8 seconds will keep the rip current risk enhanced today. Local rip current calculations push the rip risk into the high category for the Georgia beaches with Tybee Island reporting several moderate to strong rip currents Sunday. The risk was limited to a high-end moderate for the South Carolina beaches given no reports have been received from any of those beaches yet. A moderate risk for rip currents remains in place for all beaches for Tuesday.

TIDES/COASTAL FLOODING
Another round of coastal flooding is expected with this evening's high tide. Coastal Flood Advisories will likely be needed for most, if not all, of the coastal counties (excluding Tidal Berkeley). Coastal flooding will again be possible with the Tuesday evening high tide, likely only for Charleston County and coastal Colleton County.

CHS WATCHES/WARNINGS/ADVISORIES
GA...High Risk for Rip Currents until 8 PM EDT this evening for GAZ117- 119-139-141.
Coastal Flood Advisory from 7 PM to 11 PM EDT this evening for GAZ117-119-139-141.
SC...Coastal Flood Advisory from 7 PM to 11 PM EDT this evening for SCZ048>051.
MARINE...None.