City vs city
Port Royal vs Rock Hill, SC
Port Royal currently scores 3 points higher overall than Rock Hill, 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
Port Royal: 45/100 · Rock Hill: 42/100
Port Royal is 3 points higher.
Flood
Port Royal: 92/100 · Rock Hill: 33/100
Port Royal is 59 points higher.
Port Royal: FEMA NFHL flood zones: 18 features intersect this tile.
Rock Hill: FEMA NFHL flood zones: 13 features intersect this tile.
Wind
Port Royal: 45/100 · Rock Hill: 19/100
Port Royal is 26 points higher.
Port Royal: Wind exposure derived from ingested design wind / climatology tiles.
Rock Hill: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Port Royal: 61/100 · Rock Hill: 46/100
Port Royal is 15 points higher.
Port Royal: Lightning exposure derived from ingested climatology tiles.
Rock Hill: Lightning exposure derived from ingested climatology tiles.
Tornado
Port Royal: 4/100 · Rock Hill: 19/100
Rock Hill is 15 points higher.
Port Royal: Tornado risk derived from NOAA SPC historical reports.
Rock Hill: Tornado risk derived from NOAA SPC historical reports.
Hail
Port Royal: 24/100 · Rock Hill: 100/100
Rock Hill is 76 points higher.
Port Royal: Hail risk derived from NOAA SPC historical reports.
Rock Hill: Hail risk derived from NOAA SPC historical reports.
Storm surge
Port Royal: 99/100 · Rock Hill: Unavailable
A score difference cannot be calculated without both sources.
Port Royal: Storm surge exposure derived from NOAA SLOSH MOM (AGL) data.
Rock Hill: Storm surge model is not available for this location yet.
Wildfire
Port Royal: 10/100 · Rock Hill: 52/100
Rock Hill is 42 points higher.
Port Royal: Wildfire exposure derived from ingested fire potential tiles.
Rock Hill: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Port Royal: 21/100 · Rock Hill: 24/100
Rock Hill is 3 points higher.
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.
Rock Hill: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.