Marine Weather Net

South Santee River to Edisto Beach, SC Marine Forecast


TONIGHT

SW
WINDS
20 - 25
KNOTS

THU

SW
WINDS
15 - 20
KNOTS

THU NIGHT

SW
WINDS
15 - 20
KNOTS

FRI

SW
WINDS
10 - 15
KNOTS

The Marine Weather Forecast In Detail:
AMZ350 Forecast Issued: 724 PM EDT Wed Jul 17 2024

SMALL CRAFT ADVISORY IN EFFECT UNTIL 6 AM EDT THURSDAY
Tonight...Sw Winds 20 To 25 Kt. Seas 3 To 4 Ft, Building To 4 To 5 Ft. Wave Detail: S 4 Ft At 5 Seconds And Se 2 Ft At 8 Seconds, Becoming S 5 Ft At 5 Seconds And Se 2 Ft At 8 Seconds. A Chance Of Showers And Tstms Late This Evening.
Thu...Sw Winds 15 To 20 Kt. Seas 4 To 5 Ft, Subsiding To 3 To 4 Ft In The Afternoon. Wave Detail: S 5 Ft At 7 Seconds, Becoming S 4 Ft At 6 Seconds And Se 2 Ft At 9 Seconds. A Chance Of Showers And Tstms.
Thu Night...Sw Winds 15 To 20 Kt With Gusts To 25 Kt. Seas 3 To 4 Ft. Wave Detail: S 4 Ft At 5 Seconds And Se 2 Ft At 9 Seconds. Showers And Tstms Likely.
Fri...Sw Winds 10 To 15 Kt. Seas 3 To 4 Ft. Wave Detail: Se 3 Ft At 7 Seconds. Showers And Tstms Likely.
Fri Night...Sw Winds 10 To 15 Kt. Seas 3 Ft. Wave Detail: S 3 Ft At 5 Seconds And Se 2 Ft At 9 Seconds. Showers And Tstms Likely.
Sat...Sw Winds 10 To 15 Kt. Seas 3 Ft. Wave Detail: S 3 Ft At 5 Seconds And Se 3 Ft At 8 Seconds. Showers And Tstms Likely.
Sat Night...S Winds 10 To 15 Kt. Seas 3 Ft. Showers And Tstms Likely, Mainly In The Evening.
Sun...Sw Winds 10 Kt. Seas 3 Ft. A Chance Of Showers And Tstms.
Sun Night...S Winds 10 To 15 Kt. Seas 3 To 4 Ft. A Chance Of Showers And Tstms.
Mon...S Winds 10 Kt. Seas 3 To 4 Ft. A Chance Of Showers And Tstms.
Mon Night...S Winds 10 To 15 Kt. Seas 3 To 4 Ft. A Chance Of Showers And Tstms. Winds And Seas Higher In And Near Tstms.
SHARE THIS PAGE:           
Area Forecast Discussion
National Weather Service Charleston SC
754pm EDT Wednesday July 17 2024

Synopsis
High pressure will persist offshore, while a weak trough resides inland. A cold front will approach the region late week and likely stall nearby, before High pressure returns next week.

Near Term - Until 6am Thursday Morning
Latest Storm Prediction Center mesoanalysis indicated a large pocket of instability across the SC Lowcountry. Isolated to scattered showers and thunderstorms should continue to develop across the region well into this evening. In addition, remnant stratiform rain across SE GA should continue for a couple hours, then dissipating later this evening. The forecast update will feature areas of rain- cooled air across SE GA and portions of the SC Lowcountry. In addition, adjustments were made to the hourly sky cover and PoPs.

Lows tonight will range from the lower-mid 70s across the interior to around 80 at the beaches and Downtown Charleston.

Short Term - 6am Thursday Morning Through Saturday
The mid-levels will consist of broad troughing prevailing over the eastern half of the U.S. Thursday and Friday. High pressure begins to build into the region from the east on Saturday. At the surface, High pressure will persist offshore, while a weak trough resides inland on Thursday. A cold front will approach the region Friday, likely stalling nearby into the weekend. Though, it appears to be closest to our region on Friday. There will be deep moisture across the region, with PWATs (Precipitable Waters) over 2". High temperatures are expected to be in the lower to middle 90s each day across most of our area, except cooler at the beaches. This heat and moisture will combine to generate plenty of instability, causing scattered to numerous convection each afternoon and evening. Though, the most coverage and intensity appears to be on Friday. Given the time of year, a strong to marginally severe thunderstorm is certainly possible each day, with the main concern being damaging winds. Locally heavy rainfall is also possible in areas where there is storm training. Though, steering flow may help move the storms along each day. As for heat indices, they are expected to approach 105-108 degrees along the coast each day. But the duration and coverage may not be enough to warrant Heat Advisories, especially considering afternoon convection will cool temperatures down. Overnight lows will remain in the 70s.

Long Term - Saturday Night Through Wednesday
A summertime pattern will persist with High pressure in the western Atlantic and troughing along or near the Southeast U.S. This synoptic flow will keep abundant moisture across the region. With highs in the 90s, instability will generate afternoon convection, trending lower during the overnight hours.

Marine
Tonight: Pressure gradient will remain a bit tight across the coastal waters through much of tonight, supporting 15 to 20 knot sustained winds. Gusts to around 25 knots will continue over the South Santee-Savannah River nearshore legs through much of tonight (where Small Craft Advisories are in effect), and in Charleston Harbor until early this evening. Seas will build 3-5 ft.

Extended Marine: High pressure will persist near Bermuda, while a weak trough is inland Thursday. A cold front will approach the region Friday, stalling nearby through the weekend. There should be a surge of winds Thursday afternoon. It'll be borderline whether Small Craft Advisories will be needed, mainly for the Charleston waters. Otherwise, expect mainly southerly winds 10-15 kts, stronger along the land/sea interface with the formation of the afternoon sea breeze. Some nocturnal jetting is also possible. Seas should average 2-4 ft.

Rip Currents
Thursday: The combination of a 2 ft swell every 8-9 seconds and gusty onshore winds will support a Moderate Risk for rip currents at all of our beaches.

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

Marine
Small Craft Advisory until midnight EDT tonight for AMZ330. Small Craft Advisory until 6am EDT Thursday for AMZ350-352.