South Santee River to Edisto Beach, SC Marine Forecast
| Rest Of Today...Sw Winds 10 To 15 Kt With Gusts To 20 Kt, Increasing To 15 To 20 Kt. Seas 2 To 3 Ft, Building To 3 To 4 Ft. Wave Detail: Se 3 Ft At 7 Seconds, Becoming Sw 3 Ft At 4 Seconds And Se 3 Ft At 7 Seconds. |
| Tonight...Sw Winds 10 To 15 Kt With Gusts To 20 Kt. Seas 3 To 4 Ft. Wave Detail: S 3 Ft At 6 Seconds. |
| Fri...Sw Winds 10 To 15 Kt. Seas 3 To 4 Ft. Wave Detail: S 3 Ft At 6 Seconds. |
| Fri Night...Sw Winds 10 To 15 Kt. Seas 3 Ft. Wave Detail: Sw 2 Ft At 5 Seconds And Se 2 Ft At 8 Seconds. |
| Sat...Sw Winds 10 To 15 Kt, Increasing To 15 To 20 Kt In The Afternoon. Seas 3 Ft. Wave Detail: Sw 3 Ft At 5 Seconds And Se 2 Ft At 8 Seconds. |
| Sat Night...Sw Winds 15 To 20 Kt, Becoming W 10 To 15 Kt After Midnight. Seas 3 To 4 Ft, Subsiding To 2 To 3 Ft After Midnight. Wave Detail: Sw 3 Ft At 5 Seconds And Se 2 Ft At 8 Seconds. A Slight Chance Of Tstms In The Evening. A Slight Chance Of Showers. |
| Sun...W Winds 5 To 10 Kt. Seas 2 To 3 Ft. |
| Sun Night...Sw Winds 5 To 10 Kt. Seas 2 Ft. |
| Mon...Ne Winds 5 To 10 Kt. Seas 2 Ft. |
| Mon Night...S Winds 5 To 10 Kt. Seas 2 Ft. Winds And Seas Higher In And Near Tstms. |
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Area Forecast Discussion National Weather Service Charleston SC 1208pm EDT Thu May 15 2025 Synopsis Broad high pressure will remain across the area into the weekend. A weak cold front could approach the region Sunday, with high pressure returning thereafter. Near Term - Through Tonight The forecast looks on track. Dewpoints are mixing out a bit more than anticipated. Some slight adjustments were made to account for this. The axis of a H5 ridge will ripple across the Deep South today, resulting in rising height across the forecast area. At the sfc, a high centered over the western Atlantic will extend west across northern FL and GA. Given warm llevel thicknesses and strong insolation, high temperatures are forecast to range from the upper 80s to low 90s, mid 90s possible across extreme SE GA. A slow moving sea breeze should drift inland during the mid to late afternoon. Forecast soundings indicate a subsidence inversion centered at H85, resulting in a thin layer of CIN through this afternoon. The sea breeze may support a thin line of shallow cumulus. The forecast will remain dry today. Tonight: The axis of the H5 ridge is timed to move over the CWA by late tonight. Satellite and HREF simulated water vapor indicates that a plume of high and mid level moisture, supporting at least partly cloudy conditions late tonight. Given increasing cloud cover and warm llevel thicknesses, low temperatures should range around 70 degrees. Short Term - Friday Through Sunday High pressure will be the dominant feature on Friday, both a the surface and aloft. A dry forecast has been maintained, with plentiful sunshine. A summer-like airmass will take up residence over the forecast area on Friday, with dew points surging to the upper 60s to low 70s and high temperatures in the low to mid 90s. This will yield heat index values around 100-105; shy of Heat Advisory criteria, but the region's first shot of summer-like temperatures. Record high temperatures could be tied/exceeded at some of the local climate sites, see the Climate section for more details. Overnight temperatures will be very mild, only dropping into the upper 60s to low 70s. The flow aloft on Saturday will shift from ridging to zonal flow. At the surface high pressure will remain just off the southeastern coast while a trough develops along the SC Midlands. Another dry forecast is in store, with above normal temperatures. While dew points are forecast to be slightly lower than on Friday, therefore yielding lower heat index values, high temperatures are still expected to reach into the low to mid 90s. Another mild night Saturday night, with lows in the upper 60s to low 70s. The zonal flow aloft will prevail on Sunday, with a weak shortwave rippling across the southeastern states. At the surface a weak cold front will attempt to push into the region. Models are in disagreement in regards to precipitation chances associated with the front, with the ECMWF (European Centre for Medium-Range Weather Forecasts) and NBM dry and the GFS/GEFS showing isolated showers/tstorms. The current forecast is a middle ground solution, with Probability of Precipitation <20% across zones generally west of I-95. Temperatures will once again be above normal, with low to mid 90s expected. Long Term - Sunday Night Through Wednesday The flow aloft will shift from zonal flow to ridging early in the week, with high pressure prevailing at the surface. The summer-like conditions will persist with daytime highs and overnight lows well above normal. The forecast does not feature precipitation chances until mid-week when isolated to scattered showers/tstorms are possible. Marine Winds in the Charleston Harbor were nudged into the 15-20 kt range this afternoon given the expected sea breeze surge. Gusts should largely remain below 25 kt and below Small Craft Advisory levels. Today and tonight, broad surface high pressure will gradually build across the marine zones. The pattern should support southwest winds between 10 to 15 kts, with gusts around 20 kts during the afternoon hours following a sea breeze. Seas are forecast to range from 2 to 4 ft. Friday through Tuesday: High pressure will remain the dominant feature across the marine zones through the weekend and into early next week. Southerly winds less than 15 knots are expected, with seas averaging 2 to 3 ft. Rip Currents Sea breeze surging along the Charleston County beaches will push the rip current risk into the moderate category for today. Low risk was maintained for the far southern South Carolina and Georgia beaches. Climate Record High Temperatures: May 16: KCHS: 94/1941 KSAV: 95/1915 May 17: KCHS: 96/1963 KCXM: 94/1899 KSAV: 97/1899 May 18: KSAV: 97/1899 Record High Minimum Temperatures: May 16: KCHS: 71/2018 KSAV: 74/1915 May 17: KCHS: 74/1995 KCXM: 75/1998 KSAV: 74/1995 May 18: KCHS: 75/1995 KCXM: 77/1991 KSAV: 74/1899 NOAA Charleston SC Office: Watches - Warnings - Advisories GA...None. SC...None. Marine None. |
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