Marine Weather Net

South Santee River to Edisto Beach, SC Marine Forecast


TONIGHT

SW
WINDS
10
KNOTS

SAT

S
WINDS
5 - 10
KNOTS

SAT NIGHT

S
WINDS
10
KNOTS

SUN

SW
WINDS
5 - 10
KNOTS

The Marine Weather Forecast In Detail:
AMZ350 Forecast Issued: 1001 PM EDT Fri Aug 07 2020

Tonight...Sw Winds 10 Kt. Seas 2 To 3 Ft. A Slight Chance Of Showers And Tstms.
Sat...S Winds 5 To 10 Kt. Seas 2 Ft. A Slight Chance Of Tstms. A Slight Chance Of Showers.
Sat Night...S Winds 10 Kt. Seas 2 Ft. A Slight Chance Of Tstms. A Slight Chance Of Showers In The Evening, Then A Chance Of Showers After Midnight.
Sun...Sw Winds 5 To 10 Kt, Becoming S In The Afternoon. Seas 2 Ft. A Slight Chance Of Tstms. A Chance Of Showers, Mainly In The Morning.
Sun Night...Sw Winds 5 To 10 Kt. Seas 2 Ft. A Chance Of Showers With A Slight Chance Of Tstms.
Mon...Sw Winds 5 To 10 Kt. Seas 2 Ft. A Slight Chance Of Showers And Tstms In The Morning, Then A Chance Of Showers And Tstms In The Afternoon.
Mon Night...Sw Winds 5 To 10 Kt. Seas 2 Ft. A Chance Of Showers And Tstms.
Tue...S Winds 5 To 10 Kt. Seas 2 Ft. A Chance Of Showers And Tstms.
Tue Night...S Winds 5 To 10 Kt. Seas 2 Ft. A Chance Of Showers And Tstms.
Wed...S Winds 5 To 10 Kt. Seas 2 Ft. A Chance Of Showers And Tstms.
Wed Night...S Winds 5 To 10 Kt. Seas 2 To 3 Ft. A Chance Of Showers And Tstms. Mariners Are Reminded That Winds And Seas Higher In And Near Tstms.
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Area Forecast Discussion
National Weather Service Charleston SC
1019pm EDT Fri August 7 2020

Synopsis
A stationary front will linger to the west through the weekend before dissipating. The region will then be positioned between Atlantic high pressure centered offshore and an inland area of broad low pressure.

Near Term - Through Saturday
The combination of a short wave aloft, plenty of moisture (PWat in excess of 2 inches), sufficient instability and lingering boundaries will generate isolated to scattered showers and t-storms through the night. Increasing convergence from off the ocean and the proximity to the inland stationary front off to the northwest, will result in the better chances over the Charleston quad-county region.

Locally heavy rains and gusty winds will be the primary hazards that occur.

Otherwise, convective debris clouds will gradually diminish, as scattered to perhaps locally broken stratocumulus will occur throughout.

Where cloud cover shrinks enough, there could be some fog in locations that received rainfall Friday afternoon and evening. But given that condensation pressure deficits aren't that low, we did not include in the latest forecast.

Min temperatures will be in the low to mid 70s far inland and upper 70s along the coast.

Short Term - Saturday Night Through Monday
Saturday: It is possible that a few remnant showers from this evening's convection over the Midlands will linger until the daylight hours Saturday. However, HREF indicates that convection, if any remains, will be very light. The forecast will generally focus on the formation of the sea breeze during the late morning hours, drifting inland during the afternoon and evening. Given the combination of deep moisture, moderate instability, and a sea breeze, Probability of Precipitation are forecast to peak between 40-50 percent during the afternoon. High temperatures are forecast to range from the low 90s across the SC Lowcountry to the mid 90s across SE GA. Heat index values across the SE GA coastal counties may peak around 105 degrees Saturday afternoon. Saturday night, near term models indicate that the axis of a H5 trough will approach from the west. Weak forcing associated with the trough is expected to arrive Saturday night, a few showers and thunderstorms may develop and persist over the waters. Low temperatures are forecast to range in the mid to upper 70s.

Sunday and Monday: The axis of a H5 trough will slowly ripple over the region. Forecast soundings indicate slightly cooler mid-level temps and steeper lapse rates. Given lingering moisture, scattered to numerous thunderstorms are expected each afternoon and evening across the forecast area, especially across SE GA. High temperatures and heat index values should not vary by more than a couple of degrees from the values on Saturday.

Long Term - Monday Night Through Friday
The mid-level weakness is forecast to amplify by mid-week, possibly briefly cutting off over central South Carolina and Georgia as weak shortwave ridging develops to its north and a pronounced shortwave passes north over the Ohio Valley and Mid-Atlantic. This should help increase the amount of showers/tstms each afternoon within a ribbon of tropical moisture (PWATs (Precipitable Waters) at or above 2.25") with rain chances lingering through the night. probability of precipitation 50-60% Tuesday will increase to 60- 70% both Wednesday and Thursday when the weakness/upper low makes its closest approach. Highs are expected to top out in the lower-mid 90s Tuesday, then lower into the upper 80s/lower 90s by mid-week as afternoon heating will be limited by numerous showers/tstms. Isolated strong tstms will be possible and there will be a risk for localized flooding, especially in low-lying and poor drainage areas. Lows will range from the lower-mid 70s inland with upper 70s/lower 80s at the coast and Downtown Charleston, although daily lows could be augmented at times by convective influences.

Marine
Tonight: Between Atlantic high pressure and an inland stationary front, winds will remain S or SW at or below 15 kt, with seas generally 2-3 feet. A few of the t-storms could still produce gusty winds and heavy rainfall.

Saturday through Tuesday: The surface pattern will feature high pressure centered over the western Atlantic and broad low pressure inland. This pattern should generally support south winds between 10 to 15 kt and seas between 1-2 ft. The formation of land breeze circulations will be possible during early morning hours resulting in a light westerly wind around sunrise. This feature could be a focus for waterspouts during mid-late morning hours for the next several days.

NOAA Charleston SC Office: Watches - Warnings - Advisories
GA...None. SC...None. MARINE...None.