Edisto Beach, SC to Savannah, GA Marine Forecast
| This Afternoon...N Winds 20 To 25 Kt With Gusts To 30 Kt. Seas 7 To 10 Ft. Wave Detail: E 8 Ft At 16 Seconds And E 4 Ft At 9 Seconds. A Chance Of Showers. |
| Tonight...N Winds 20 To 25 Kt With Gusts To 30 Kt. Seas 7 To 10 Ft, Subsiding To 6 To 9 Ft. Wave Detail: E 10 Ft At 15 Seconds, Becoming E 9 Ft At 15 Seconds. |
| Wed...Ne Winds 15 To 20 Kt With Gusts To 25 Kt. Seas 6 To 8 Ft, Subsiding To 5 To 7 Ft. Wave Detail: E 8 Ft At 15 Seconds, Becoming E 7 Ft At 13 Seconds. |
| Wed Night...Ne Winds 20 To 25 Kt With Gusts To 30 Kt. Seas 5 To 8 Ft. Wave Detail: E 7 Ft At 11 Seconds, Becoming E 8 Ft At 11 Seconds. |
| Thu...Ne Winds 20 To 25 Kt, Increasing To 25 To 30 Kt In The Afternoon. Seas 6 To 8 Ft. Wave Detail: E 8 Ft At 7 Seconds And E 8 Ft At 10 Seconds. A Slight Chance Of Showers In The Afternoon. |
| Thu Night...Ne Winds 25 To 30 Kt. Seas 7 To 9 Ft. Wave Detail: E 9 Ft At 8 Seconds And E 1 Foot At 15 Seconds. A Chance Of Showers. |
| Fri...Ne Winds 20 To 25 Kt. Seas 6 To 8 Ft. A Chance Of Showers. |
| Fri Night...Ne Winds 20 To 25 Kt. Seas 5 To 7 Ft. A Chance Of Showers And Tstms. |
| Sat...Ne Winds 20 Kt. Seas 5 To 6 Ft. A Chance Of Showers With A Slight Chance Of Tstms. |
| Sat Night...E Winds 15 To 20 Kt. Seas 5 To 6 Ft. A Chance Of Showers And Tstms. Winds And Seas Higher In And Near Tstms. |
| Area Forecast Discussion National Weather Service Charleston SC 209pm EDT Tuesday September 30 2025 Synopsis Hurricane Imelda will move northeast away from the Southeast U.S. coast through Wednesday. High pressure will then prevail through the end of the week. Near Term - Through Tonight Hurricane Imelda located well offshore of the Southeast U.S. will continue to move the northeast into Wednesday. Drier air noted over the Delmarva and the Virginia Tidewater this afternoon is forecast to drop quickly south and expand over the region tonight which will bring a change in airmass over the region. Light rain showers this evening will end by late afternoon/early evening as the drier air begins to advect south. Cloud ceilings will steadily lift with high clouds mainly dominating for the overnight period. Lows tonight will range from the lower 60s well inland to around 70 at the beaches. Breezy conditions along the beaches may diminish a bit overnight as winds back more northerly. What is now Hurricane Imelda will be pushing out to sea by Wednesday morning, with drier air being advected across the region leading to a dry forecast. In fact, dew points in the upper 50s to lower 60s will be common before an afternoon sea- breeze attempts to push ashore, possibly bringing dew points into the mid 60s alongshore. Without all of the moisture to heat up, h850 temps of near 15 deg C will bring the region back into the lower to mid 80s, accompanied by breezy northeast winds. Overnight into Thursday, a closed off upper level low opens up into a trough as it approaches the southern portion of the east coast, with a surface high pressure expanding along the northern portion of the east coast. Cold-air advection at the h850 level will keep afternoon highs on the cooler side in the mid 70s to lower 80s, so it'll certainly feel like fall out there! Unfortunately the surface pressure gradient will remain fairly consistent, keeping northeasterly winds on the breezier side with gusts into the lower to mid 20s. Shortwaves from the aforementioned trough begin to move across our Georgia coast during the late afternoon and evening hours, so can't rule out a few showers or even a thunderstorm, with chances expanding northwards up along the South Carolina coast by sunrise Friday. Overnight into Friday morning, the region looks to firmly be in a surface pressure wedging scenario, keeping us on the cooler side of normal with highs in the upper 70s to lower 80s. Breezy winds will also be continuing, gusting into the teens to lower 20s throughout the day. Long Term - Friday Night Through Monday Surface high pressure wedging is expected to continue into the weekend, though the high pressure itself will be shifting eastwards into the Atlantic waters. This will continue our similar conditions since Thursday, though winds will be slightly more east than northeastwards. Given the slight shift in wind direction, it does tend to allow for a sea-breeze to form, which will aid in creating scattered showers and thunderstorms during the afternoon hours on Saturday and again on Sunday. Given little change in the pattern Saturday and Sunday, training thunderstorms (thunderstorms going over the same location) may be capable of leading to rainfall totals adding up to 2+ inches. While this alone won't lead to any minor flooding concerns, if a local area did see a stronger storm that is able to produce higher rainfall, minor flooding may be possible, which WPC agrees with and has a Marginal risk (level 1 out of 4) for excessive rainfall. Marine Tonight: Hazardous marine conditions are in place across the waters this afternoon with north to northeast of 20-25 kt with gusts to 30 kt prevailing. There have been some local wind minimums observed at times today, which have been hard to both diagnose and depict in the gridded forecasts. Overall, 20-25 kt with gusts to 30 kt should prevail through the night as winds turn more northerly all areas overnight. Seas will reach 6-10 ft across the nearshore waters and 10-13 ft over the Georgia offshore waters. Small Craft Advisories will remain in place for all legs through tonight. For the Charleston Harbor, winds will remain rather marginal for an advisory, but the advisory was maintained for 15-20 kt with gusts to 25 kt and waves 1-2 ft. Wednesday through Sunday: Breezy north-northeasterly winds at 20 to 25 kt with gusts up to 30-33 kt will likely hold through the middle of the week, given the increased surface pressure gradient from Hurricanes Imelda and Humberto over the Atlantic and a surface high pressure building down from Canada. In addition, swells from Imelda with long-period swell from Humberto will continue to build into the local waters through the weekend causing seas to slowly increase to 8 to 10 ft in the nearshore waters, and 10 to 11 ft in the outer Georgia waters on Wednesday and Thursday. By Friday, the swell should begin to taper off some, but seas will remain quite volatile into the weekend with waves +6 ft across all marine zones. Therefore, Small Craft Advisories (SCAs) have been issued for all marine zones through the end of the week, though the Charleston Harbor will likely need to be ended sooner) due the combination of high winds and seas. Rip Currents/High Surf: Tonight: Local surf shops and public reports show breakers at Folly Beach have been 4-5 ft with sets as high as 6-7 ft at times over at the Wash Out. NWPS wave breaking guidance suggest breaking waves may increase by about one more foot through tonight. The High Surf Advisory and High Rip Current Risk were maintained. Tuesday through Saturday: A High Risk of rip currents is expected into Thursday at all beaches due to large, long-period swells and strong winds. In addition, large breaking waves of 5+ feet are expected through much of the week and a High Surf Advisory remains in effect. Tides / Coastal Flooding The Coastal Flood Advisory for Charleston and Coastal Colleton Counties has been cancelled. Northerly winds should keep tidal departures less than 1.5 ft at high tide, which would tide levels below the minor flood threshold of 7.0 ft in the Charleston Harbor. As astronomical tides increase later this week, the risk for minor coastal flooding will persist for mainly Charleston and Coastal Colleton Counties. Heading into this weekend and early next week, astronomical tides will increase due to the upcoming Full Moon (Oct 7) and Perigee (Oct 8). This in combination with the anticipation of continued northeasterly flow will cause the possibility of coastal flooding to become more likely along the entire coastline, including both Downtown Charleston and Fort Pulaski. Saltwater inundation could then occur during both the morning and evening high tide cycles during this time. Although there is considerable uncertainty this far out, persistent favorable winds have the potential to produce up to major coastal flooding. NOAA Charleston SC Office: Watches - Warnings - Advisories GA...High Risk for Rip Currents through Wednesday evening for GAZ117-119- 139-141. High Surf Advisory until 8am EDT Saturday for GAZ117-119-139- 141. SC...High Risk for Rip Currents through Wednesday evening for SCZ048>051. High Surf Advisory until 8am EDT Saturday for SCZ048>051. Marine Small Craft Advisory until 2am EDT Wednesday for AMZ330. Small Craft Advisory until 6am EDT Monday for AMZ350-352-354- 374. |
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