City vs city
Columbia vs Harbor Island, SC
Harbor Island currently scores 1 points higher overall than Columbia, 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
Columbia: 46/100 · Harbor Island: 47/100
Harbor Island is 1 points higher.
Flood
Columbia: 37/100 · Harbor Island: 85/100
Harbor Island is 48 points higher.
Columbia: FEMA NFHL flood zones: 7 features intersect this tile.
Harbor Island: FEMA NFHL flood zones: 13 features intersect this tile.
Wind
Columbia: 24/100 · Harbor Island: 49/100
Harbor Island is 25 points higher.
Columbia: Wind exposure derived from ingested design wind / climatology tiles.
Harbor Island: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Columbia: 72/100 · Harbor Island: 52/100
Columbia is 20 points higher.
Columbia: Lightning exposure derived from ingested climatology tiles.
Harbor Island: Lightning exposure derived from ingested climatology tiles.
Tornado
Columbia: 12/100 · Harbor Island: 0/100
Columbia is 12 points higher.
Columbia: Tornado risk derived from NOAA SPC historical reports.
Harbor Island: Tornado risk derived from NOAA SPC historical reports.
Hail
Columbia: 83/100 · Harbor Island: 4/100
Columbia is 79 points higher.
Columbia: Hail risk derived from NOAA SPC historical reports.
Harbor Island: Hail risk derived from NOAA SPC historical reports.
Storm surge
Columbia: Unavailable · Harbor Island: 98/100
A score difference cannot be calculated without both sources.
Columbia: Storm surge model is not available for this location yet.
Harbor Island: Storm surge exposure derived from NOAA SLOSH MOM (AGL) data.
Wildfire
Columbia: 67/100 · Harbor Island: 16/100
Columbia is 51 points higher.
Columbia: Wildfire exposure derived from ingested fire potential tiles.
Harbor Island: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Columbia: 26/100 · Harbor Island: 24/100
Columbia is 2 points higher.
Columbia: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.
Harbor 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.