City vs city
Boulder Canyon vs Sioux Falls, SD
Sioux Falls currently scores 3 points higher overall than Boulder Canyon, with the largest gap in tornado.
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
Boulder Canyon: 47/100 · Sioux Falls: 50/100
Sioux Falls is 3 points higher.
Flood
Boulder Canyon: 47/100 · Sioux Falls: 52/100
Sioux Falls is 5 points higher.
Boulder Canyon: FEMA NFHL flood zones: 2 features intersect this tile.
Sioux Falls: FEMA NFHL flood zones: 17 features intersect this tile.
Wind
Boulder Canyon: 19/100 · Sioux Falls: 20/100
Sioux Falls is 1 points higher.
Boulder Canyon: Wind exposure derived from ingested design wind / climatology tiles.
Sioux Falls: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Boulder Canyon: 26/100 · Sioux Falls: 46/100
Sioux Falls is 20 points higher.
Boulder Canyon: Lightning exposure derived from ingested climatology tiles.
Sioux Falls: Lightning exposure derived from ingested climatology tiles.
Tornado
Boulder Canyon: 0/100 · Sioux Falls: 58/100
Sioux Falls is 58 points higher.
Boulder Canyon: Tornado risk derived from NOAA SPC historical reports.
Sioux Falls: Tornado risk derived from NOAA SPC historical reports.
Hail
Boulder Canyon: 100/100 · Sioux Falls: 100/100
No gap.
Boulder Canyon: Hail risk derived from NOAA SPC historical reports.
Sioux Falls: Hail risk derived from NOAA SPC historical reports.
Storm surge
Boulder Canyon: Unavailable · Sioux Falls: Unavailable
A score difference cannot be calculated without both sources.
Boulder Canyon: Storm surge model is not available for this location yet.
Sioux Falls: Storm surge model is not available for this location yet.
Wildfire
Boulder Canyon: 63/100 · Sioux Falls: 51/100
Boulder Canyon is 12 points higher.
Boulder Canyon: Wildfire exposure derived from ingested fire potential tiles.
Sioux Falls: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Boulder Canyon: 28/100 · Sioux Falls: 21/100
Boulder Canyon is 7 points higher.
Boulder Canyon: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.
Sioux Falls: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.