South Santee River to Edisto Beach, SC Marine Forecast
|Tonight...S Winds 5 To 10 Kt, Becoming Sw 10 To 15 Kt. Seas 2 To 4 Ft.|
|Tue...W Winds 10 To 15 Kt, Becoming Sw 5 To 10 Kt In The Afternoon. Seas 4 To 5 Ft.|
|Tue Night...Sw Winds 5 To 10 Kt. Seas 4 To 5 Ft, Subsiding To 3 To 4 Ft After Midnight.|
|Wed...S Winds 5 To 10 Kt. Seas 3 To 4 Ft.|
|Wed Night...S Winds 10 To 15 Kt. Seas 3 To 4 Ft.|
|Thu...Sw Winds 10 To 15 Kt. Seas 3 To 4 Ft.|
|Thu Night...S Winds 10 To 15 Kt. Seas 3 Ft.|
|Fri...S Winds 10 Kt. Seas 3 Ft.|
|Fri Night...Se Winds 10 Kt. Seas 3 Ft.|
|Sat...E Winds 10 To 15 Kt. Seas 2 Ft. A Slight Chance Of Showers.|
|Sat Night...E Winds 10 To 15 Kt. Seas 2 Ft.|
Area Forecast Discussion|
National Weather Service Charleston SC
313pm EDT Monday September 23 2019
A weak cold front will move into the area Tuesday and then slowly dissipate through mid week. High pressure will then return this weekend.
.NEAR TERM Through Tonight
A powerful upper low over southern Ontario will approach New England tonight. A shortwave trailing to its south will help push a weak cold front across the southern Appalachians and into the Carolina Piedmont overnight. The front looks to remain north of the local area through daybreak as high pressure sinks to the south across the northern Gulf States.
Diurnal cumulus will quickly dissipate after sunset with the loss of insolation yielding clear skies. A few thin cirrus could brush the southern South Carolina zones after midnight, but should contribute little to the total cloud cover. Expect the boundary layer to decouple across the interior later this evening. Clear skies, low dewpoints and calm/light winds will support another night of solid radiational cooling. Most statistical guidance has been running a bit too warm over the past few nights, especially across the interior. The expanding drought/dry soil conditions could be contributing to this. Have adjusted lows down several degrees for the updated low temperature forecast. Lows are expected to fall into the lower 60s inland, mid-upper 60s at the coast to the lower 70s at the beaches.
Short Term - Tuesday Through Thursday
A relatively dry, hot pattern is anticipated Tuesday through Thursday. A weak cold front will drop into the area late Tuesday, then stall before dissipating. Wednesday afternoon a weak surface trough is expected to move through the northern portion of the area. There could be just enough instability Wednesday afternoon to support an isolated shower or thunderstorm. Although the entire period will feature above- normal high temps, Thursday looks the hottest due to downslope flow producing adiabatic heating.
Long Term - Thursday Night Through Sunday
Moderate confidence this period. No significant concerns with high pressure generally prevailing. Given the lack of strong instability/forcing we aren't expecting much rain. Temperatures will stay above normal through the period, with heat indices likely peaking near 100 degrees inland Friday (especially in GA).
Tonight: No concerns. Winds will veer to the southwest overnight and increase slightly ahead of an approaching cold front. Speeds will remain 10 kt or less. Seas will build by about a foot and will continue to be dominated by mostly easterly swell.
Tuesday through Saturday: A relatively quiet pattern will continue Tuesday into the weekend as high pressure persists. Swells from distant TC Jerry will continue to impact the waters, especially Tuesday and Wednesday, with a few 5 footers possible over the offshore GA waters.
Long period easterly swell with elevated wave energy will result in a moderate rip current risk for all beaches through Tuesday. An elevated risk will likely continue much of this week, mainly due to astronomical influences and swells.
Tides / Coastal Flooding
Increasing astronomical influences from the upcoming perigee and new moon will result in elevated tide cycles mid to late this week. Although it is too early to pin down with much certainty, the potential for northeast winds late in the weekend into early next week, combined with the highest of the astronomical tides, could result in Moderate coastal flooding.
NOAA Charleston SC Office: Watches - Warnings - Advisories
GA...None. SC...None. MARINE...None.