City vs city
Gregory vs Sioux Falls, SD
Sioux Falls currently scores 10 points higher overall than Gregory, with the largest gap in lightning.
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
Gregory: 40/100 · Sioux Falls: 50/100
Sioux Falls is 10 points higher.
Flood
Gregory: Unavailable · Sioux Falls: 52/100
A score difference cannot be calculated without both sources.
Gregory: Flood model is not available for this location yet.
Sioux Falls: FEMA NFHL flood zones: 17 features intersect this tile.
Wind
Gregory: 21/100 · Sioux Falls: 20/100
Gregory is 1 points higher.
Gregory: Wind exposure derived from ingested design wind / climatology tiles.
Sioux Falls: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Gregory: 32/100 · Sioux Falls: 46/100
Sioux Falls is 14 points higher.
Gregory: Lightning exposure derived from ingested climatology tiles.
Sioux Falls: Lightning exposure derived from ingested climatology tiles.
Tornado
Gregory: 46/100 · Sioux Falls: 58/100
Sioux Falls is 12 points higher.
Gregory: Tornado risk derived from NOAA SPC historical reports.
Sioux Falls: Tornado risk derived from NOAA SPC historical reports.
Hail
Gregory: 100/100 · Sioux Falls: 100/100
No gap.
Gregory: Hail risk derived from NOAA SPC historical reports.
Sioux Falls: Hail risk derived from NOAA SPC historical reports.
Storm surge
Gregory: Unavailable · Sioux Falls: Unavailable
A score difference cannot be calculated without both sources.
Gregory: Storm surge model is not available for this location yet.
Sioux Falls: Storm surge model is not available for this location yet.
Wildfire
Gregory: 40/100 · Sioux Falls: 51/100
Sioux Falls is 11 points higher.
Gregory: Wildfire exposure derived from ingested fire potential tiles.
Sioux Falls: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Gregory: Unavailable · Sioux Falls: 21/100
A score difference cannot be calculated without both sources.
Gregory: Air quality model is not available for this location yet.
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.