Coastal Flood Advisory

Locations Affected

North Charleston, SC ∙ Charleston, SC ∙ Mount Pleasant, SC ∙ Wadmalaw, SC ∙ Awendaw, SC ∙ Kiawah Island, SC ∙ Edisto Island, SC ∙ Sullivans Island, SC ∙ Bear Swamp Division, SC ∙ Cape Island, SC

Full Alert Message

Coastal Hazard Message National Weather Service Charleston SC 135 PM EDT Fri Aug 22 2025 ...COASTAL FLOOD ADVISORY REMAINS IN EFFECT FROM 7 PM TO 11 PM EDT THIS EVENING... * WHAT...Up to one half foot of inundation above ground level expected along shorelines and tidal waterways (7.3 to 7.5 feet Mean Lower Low Water at Charleston). * WHERE...Coastal Colleton and Charleston Counties. * WHEN...From 7 PM to 11 PM EDT this evening. * IMPACTS...This could result in some roads becoming impassable. * ADDITIONAL DETAILS...High tide will occur around 8:22 PM today at Charleston. Saltwater inundation will be possible 1 to 2 hours before and after high tide. PRECAUTIONARY/PREPAREDNESS ACTIONS... If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property. Visit water.weather.gov for additional water level and flood impact information. && Time of high total tides are approximate to the nearest hour. Charleston Harbor SC MLLW Categories - Minor 7.0 ft, Moderate 7.5 ft, Major 8.0 ft MHHW Categories - Minor 1.2 ft, Moderate 1.7 ft, Major 2.2 ft Total Total Departure Day/Time Tide Tide from Norm Waves Flood ft MLLW ft MHHW ft ft Impact -------- --------- --------- --------- ------- -------- 22/08 PM 7.4 1.6 1.2 N/A Minor 23/09 AM 6.8 1.0 1.3 N/A None 23/09 PM 7.4 1.6 1.3 N/A Minor 24/09 AM 6.6 0.8 1.1 N/A None 24/10 PM 6.8 1.0 0.9 N/A None

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