City vs city
Hilton Head Island vs Rock Hill, SC
Hilton Head Island currently scores 11 points higher overall than Rock Hill, 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
Hilton Head Island: 53/100 · Rock Hill: 42/100
Hilton Head Island is 11 points higher.
Flood
Hilton Head Island: 77/100 · Rock Hill: 33/100
Hilton Head Island is 44 points higher.
Hilton Head Island: FEMA NFHL flood zones: 19 features intersect this tile.
Rock Hill: FEMA NFHL flood zones: 13 features intersect this tile.
Wind
Hilton Head Island: 46/100 · Rock Hill: 19/100
Hilton Head Island is 27 points higher.
Hilton Head Island: Wind exposure derived from ingested design wind / climatology tiles.
Rock Hill: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Hilton Head Island: 58/100 · Rock Hill: 46/100
Hilton Head Island is 12 points higher.
Hilton Head Island: Lightning exposure derived from ingested climatology tiles.
Rock Hill: Lightning exposure derived from ingested climatology tiles.
Tornado
Hilton Head Island: 31/100 · Rock Hill: 19/100
Hilton Head Island is 12 points higher.
Hilton Head Island: Tornado risk derived from NOAA SPC historical reports.
Rock Hill: Tornado risk derived from NOAA SPC historical reports.
Hail
Hilton Head Island: 87/100 · Rock Hill: 100/100
Rock Hill is 13 points higher.
Hilton Head Island: Hail risk derived from NOAA SPC historical reports.
Rock Hill: Hail risk derived from NOAA SPC historical reports.
Storm surge
Hilton Head Island: 99/100 · Rock Hill: Unavailable
A score difference cannot be calculated without both sources.
Hilton Head Island: Storm surge exposure derived from NOAA SLOSH MOM (AGL) data.
Rock Hill: Storm surge model is not available for this location yet.
Wildfire
Hilton Head Island: 5/100 · Rock Hill: 52/100
Rock Hill is 47 points higher.
Hilton Head Island: Wildfire exposure derived from ingested fire potential tiles.
Rock Hill: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Hilton Head Island: 21/100 · Rock Hill: 24/100
Rock Hill is 3 points higher.
Hilton Head 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.
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.