City vs city
Charleston vs Sullivan's Island, SC
Charleston currently scores 5 points higher overall than Sullivan's Island, with the largest gap in hail.
Use this comparison for relocation decisions, insurance shopping, and hazard-prioritized mitigation planning.
Hazard breakdown
Scores describe each city’s reference grid tile, not every property. A missing model is unavailable, not zero risk. Air quality uses an ingested EPA AirNow snapshot and may not reflect current conditions; other factors describe baseline exposure. The overall score blends different hazards and is not a probability of damage. Read the scoring methodology and sources.
Overall
Charleston: 61/100 · Sullivan's Island: 56/100
Charleston is 5 points higher.
Flood
Charleston: 89/100 · Sullivan's Island: 69/100
Charleston is 20 points higher.
Charleston: FEMA NFHL flood zones: 33 features intersect this tile.
Sullivan's Island: FEMA NFHL flood zones: 18 features intersect this tile.
Wind
Charleston: 52/100 · Sullivan's Island: 53/100
Sullivan's Island is 1 points higher.
Charleston: Wind exposure derived from ingested design wind / climatology tiles.
Sullivan's Island: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Charleston: 45/100 · Sullivan's Island: 43/100
Charleston is 2 points higher.
Charleston: Lightning exposure derived from ingested climatology tiles.
Sullivan's Island: Lightning exposure derived from ingested climatology tiles.
Tornado
Charleston: 65/100 · Sullivan's Island: 77/100
Sullivan's Island is 12 points higher.
Charleston: Tornado risk derived from NOAA SPC historical reports.
Sullivan's Island: Tornado risk derived from NOAA SPC historical reports.
Hail
Charleston: 100/100 · Sullivan's Island: 74/100
Charleston is 26 points higher.
Charleston: Hail risk derived from NOAA SPC historical reports.
Sullivan's Island: Hail risk derived from NOAA SPC historical reports.
Storm surge
Charleston: 98/100 · Sullivan's Island: 98/100
No gap.
Charleston: Storm surge exposure derived from NOAA SLOSH MOM (AGL) data.
Sullivan's Island: Storm surge exposure derived from NOAA SLOSH MOM (AGL) data.
Wildfire
Charleston: 15/100 · Sullivan's Island: 11/100
Charleston is 4 points higher.
Charleston: Wildfire exposure derived from ingested fire potential tiles.
Sullivan's Island: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Charleston: 26/100 · Sullivan's Island: 26/100
No gap.
Charleston: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.
Sullivan's Island: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.