South Santee River to Edisto Beach, SC Marine Forecast
| Today...Sw Winds 10 To 15 Kt With Gusts To 20 Kt. Seas 3 Ft. Wave Detail: S 3 Ft At 4 Seconds And Se 3 Ft At 9 Seconds. |
| Tonight...Sw Winds 10 To 15 Kt. Seas 3 Ft. Wave Detail: S 3 Ft At 4 Seconds And E 2 Ft At 9 Seconds. |
| Fri...Sw Winds 10 To 15 Kt. Seas 3 Ft. Wave Detail: S 3 Ft At 5 Seconds And E 2 Ft At 9 Seconds. |
| Fri Night...Sw Winds 10 To 15 Kt. Seas 2 To 3 Ft. Wave Detail: S 2 Ft At 5 Seconds And Se 2 Ft At 9 Seconds. |
| Sat...Sw Winds 10 To 15 Kt. Seas 2 To 3 Ft. Wave Detail: S 2 Ft At 5 Seconds And Se 2 Ft At 8 Seconds. |
| Sat Night...S Winds 10 To 15 Kt. Seas 3 To 4 Ft. Wave Detail: S 3 Ft At 5 Seconds And Se 2 Ft At 8 Seconds. |
| Sun...Sw Winds 15 To 20 Kt. Seas 3 To 4 Ft. |
| Sun Night...N Winds 20 To 25 Kt With Gusts To 30 Kt. Seas 4 To 5 Ft. |
| Mon...Ne Winds 20 To 25 Kt With Gusts To 30 Kt. Seas 4 To 6 Ft. |
| Mon Night...Ne Winds 15 To 20 Kt. Seas 3 To 4 Ft. |
| Area Forecast Discussion National Weather Service Charleston SC 115pm EDT Fri September 25 2026 .WHAT HAS CHANGED... All Key Messages and sections were updated. .KEY MESSAGES... - 1) Cool weather will linger into the weekend. Near to slightly above normal temperatures return next week. - 2) The coastal flood risk will persist into early next week. KEY MESSAGE 1: Cool weather will linger into the weekend. Near to slightly above normal temperatures return next week. GOES-E visible imagery and 25/17z surface analysis showed the deepening Nor'easter well to the northeast of Cape Hatteras with 1026 hPa high pressure centered over Lake Superior extending into the Southeast U.S. and Deep South. Direct influences from the departing Nor'easter will gradually wane this afternoon with gusty north/northwest winds quickly diminishing as sunset approaches. Tonight looks to favor a solid radiational night. The boundary layer should decouple fairly quickly this evening and with fairly low dewpoints in place, temperatures should steadily fall under clear skies. Typical for radiational nights, the 25/13z NBM looks to exhibit a warm bias through daybreak Sunday which is best highlighted by the large interquartile range (as much as 4-7 degrees) at various observation sites across the Lowcountry and Southeast Georgia. The coldest of the guidance was favored for lows tonight as a result, ranging from the upper 40s/lower 50s inland to the lower 60s at the beaches, with further local adjustments made to account for typical and well know mesoscale influences (i.e. Charleston Harbor, Broad River, Santee-Cooper lakes, Francis Marion National Forest, etc). Temperatures will begin to moderate Saturday as ridging builds aloft and surface high pressure maintains its influence on the region. Highs look to warm into the upper 70s/lower 80s and are fairly consistent with full-sun 850-1000 hPa thickness schemes. Saturday night into Sunday morning will likely be another cool night with strong radiational cooling likely coming into play again within a decoupled boundary layer. The lower side of the guidance envelop was favored with lows ranging from the lower 50s well inland to the lower-mid 60s at the beaches. Dry conditions look to persist into much of next week with broad high pressure prevailing. Temperatures will continue to moderate with near to slightly above average conditions expected. The next chances for rainfall should hold off until Thursday into Friday of next week as net moisture values begin to build back into the area along the backside of subtropical high pressure centered well offshore over the Atlantic. KEY MESSAGE 2: The coastal flood risk will linger into early next week. As a nor'easter churns offshore of the Mid-Atlantic coastline, breezy north-northeasterly flow will continue across the region. The combination of breezy winds with the full moon today will result in minor (possibly moderate) coastal flooding with each high tide cycle through the weekend (esp. for the Charleston Harbor). Charleston Harbor: With the ongoing environmental conditions, tidal levels could reach 7.4 ft MLLW in the Charleston Harbor for this evening's high tide (approx. at 755PM). Therefore, Coastal Flood Advisory has been issued from 6PM to 10PM this evening for Charleston and Colleton Counties. Saltwater inundation will be possible 2 to 3 hours before and after high tide, and will likely result in some roads becoming impassable. Coastal flooding concerns will continue tomorrow (9/26) with the potential to reach moderate flood stage for Charleston and Colleton County with the morning high tide (~8AM). Thereafter, it's likely to see minor coastal flooding conditions through early next week for the Charleston Harbor. Fort Pulaski: Tidal levels could reach 9.4 ft MLLW for this evening's high tide in Fort Pulaski (approx. at 801PM), thus this will be close to yielding minor coastal flooding impacts across lower South Carolina and southeast Georgia. However, as it remains borderline, we will continue to monitor conditions through the next several hours and will issue a Coastal Flood Advisory if it seems warranted. Additionally, guidance indicates tomorrow morning's and Sunday morning's high tide could also see minor coastal flooding. Marine Through Tonight: Winds and seas are steadily diminishing across the local marine area this afternoon a strong Nor'easter remains centered well to the northeast of Cape Hatteras. North winds will settle into the 10-15 kt with gusts to 20 kt range overnight with seas subsiding into the 2-4 ft range across the nearshore waters and 4-6 ft over the offshore waters, highest in the Georgia offshore leg. Small Craft Advisories are poised to end by 8pm over the nearshore waters, but will linger through the night across the Georgia offshore leg due to 6 ft seas. Saturday through Wednesday: Seas 4-6 ft will linger over the Georgia offshore leg through early Saturday evening and a Small Craft Advisory remains in effect there. Otherwise, fairly quiet marine conditions will dominate the coastal waters through the middle of next week. Some localized sea breeze enhancements should return across Charleston Harbor and the land/sea interface by Tuesday, but wind speeds look to remain fairly tame. Rip Currents A moderate risk for rip currents continues for all beaches through this evening. A lingering 10-12s backswell directed towards the Georgia and Florida coasts will support a moderate rip current risk from Tybee Island south to Sapelo Island both Saturday and Sunday. A low risk is anticipated for the lower South Carolina beaches both days. NOAA Charleston SC Office: Watches - Warnings - Advisories GA...None. SC...Coastal Flood Advisory from 6pm to 10pm EDT this evening for SCZ149-150. Marine Small Craft Advisory until 8pm EDT this evening for AMZ360- 362-364. Small Craft Advisory until 8pm EDT Saturday for AMZ384. |
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