City vs city
Charleston vs Marion, SC
Charleston currently scores 7 points higher overall than Marion, with the largest gap in wildfire.
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 · Marion: 54/100
Charleston is 7 points higher.
Flood
Charleston: 89/100 · Marion: 42/100
Charleston is 47 points higher.
Charleston: FEMA NFHL flood zones: 33 features intersect this tile.
Marion: FEMA NFHL flood zones: 14 features intersect this tile.
Wind
Charleston: 52/100 · Marion: 38/100
Charleston is 14 points higher.
Charleston: Wind exposure derived from ingested design wind / climatology tiles.
Marion: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Charleston: 45/100 · Marion: 67/100
Marion is 22 points higher.
Charleston: Lightning exposure derived from ingested climatology tiles.
Marion: Lightning exposure derived from ingested climatology tiles.
Tornado
Charleston: 65/100 · Marion: 73/100
Marion is 8 points higher.
Charleston: Tornado risk derived from NOAA SPC historical reports.
Marion: Tornado risk derived from NOAA SPC historical reports.
Hail
Charleston: 100/100 · Marion: 65/100
Charleston is 35 points higher.
Charleston: Hail risk derived from NOAA SPC historical reports.
Marion: Hail risk derived from NOAA SPC historical reports.
Storm surge
Charleston: 98/100 · Marion: Unavailable
A score difference cannot be calculated without both sources.
Charleston: Storm surge exposure derived from NOAA SLOSH MOM (AGL) data.
Marion: Storm surge model is not available for this location yet.
Wildfire
Charleston: 15/100 · Marion: 71/100
Marion is 56 points higher.
Charleston: Wildfire exposure derived from ingested fire potential tiles.
Marion: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Charleston: 26/100 · Marion: 25/100
Charleston is 1 points higher.
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.
Marion: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.