City vs city
Mount Vernon vs Rapid City, SD
Mount Vernon and Rapid City are tied on overall score, with the biggest factor difference 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
Mount Vernon: 42/100 · Rapid City: 42/100
No gap.
Flood
Mount Vernon: 41/100 · Rapid City: 49/100
Rapid City is 8 points higher.
Mount Vernon: FEMA NFHL flood zones: 2 features intersect this tile.
Rapid City: FEMA NFHL flood zones: 5 features intersect this tile.
Wind
Mount Vernon: 21/100 · Rapid City: 20/100
Mount Vernon is 1 points higher.
Mount Vernon: Wind exposure derived from ingested design wind / climatology tiles.
Rapid City: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Mount Vernon: 49/100 · Rapid City: 24/100
Mount Vernon is 25 points higher.
Mount Vernon: Lightning exposure derived from ingested climatology tiles.
Rapid City: Lightning exposure derived from ingested climatology tiles.
Tornado
Mount Vernon: 23/100 · Rapid City: 8/100
Mount Vernon is 15 points higher.
Mount Vernon: Tornado risk derived from NOAA SPC historical reports.
Rapid City: Tornado risk derived from NOAA SPC historical reports.
Hail
Mount Vernon: 71/100 · Rapid City: 100/100
Rapid City is 29 points higher.
Mount Vernon: Hail risk derived from NOAA SPC historical reports.
Rapid City: Hail risk derived from NOAA SPC historical reports.
Storm surge
Mount Vernon: Unavailable · Rapid City: Unavailable
A score difference cannot be calculated without both sources.
Mount Vernon: Storm surge model is not available for this location yet.
Rapid City: Storm surge model is not available for this location yet.
Wildfire
Mount Vernon: 47/100 · Rapid City: 67/100
Rapid City is 20 points higher.
Mount Vernon: Wildfire exposure derived from ingested fire potential tiles.
Rapid City: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Mount Vernon: Unavailable · Rapid City: 29/100
A score difference cannot be calculated without both sources.
Mount Vernon: Air quality model is not available for this location yet.
Rapid City: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.