City vs city
Charleston vs Port Royal, SC
Charleston currently scores 16 points higher overall than Port Royal, 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 · Port Royal: 45/100
Charleston is 16 points higher.
Flood
Charleston: 89/100 · Port Royal: 92/100
Port Royal is 3 points higher.
Charleston: FEMA NFHL flood zones: 33 features intersect this tile.
Port Royal: FEMA NFHL flood zones: 18 features intersect this tile.
Wind
Charleston: 52/100 · Port Royal: 45/100
Charleston is 7 points higher.
Charleston: Wind exposure derived from ingested design wind / climatology tiles.
Port Royal: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Charleston: 45/100 · Port Royal: 61/100
Port Royal is 16 points higher.
Charleston: Lightning exposure derived from ingested climatology tiles.
Port Royal: Lightning exposure derived from ingested climatology tiles.
Tornado
Charleston: 65/100 · Port Royal: 4/100
Charleston is 61 points higher.
Charleston: Tornado risk derived from NOAA SPC historical reports.
Port Royal: Tornado risk derived from NOAA SPC historical reports.
Hail
Charleston: 100/100 · Port Royal: 24/100
Charleston is 76 points higher.
Charleston: Hail risk derived from NOAA SPC historical reports.
Port Royal: Hail risk derived from NOAA SPC historical reports.
Storm surge
Charleston: 98/100 · Port Royal: 99/100
Port Royal is 1 points higher.
Charleston: Storm surge exposure derived from NOAA SLOSH MOM (AGL) data.
Port Royal: Storm surge exposure derived from NOAA SLOSH MOM (AGL) data.
Wildfire
Charleston: 15/100 · Port Royal: 10/100
Charleston is 5 points higher.
Charleston: Wildfire exposure derived from ingested fire potential tiles.
Port Royal: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Charleston: 26/100 · Port Royal: 21/100
Charleston is 5 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.
Port Royal: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.