City vs city
Alton vs Sioux Center, IA
Sioux Center currently scores 12 points higher overall than Alton, 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
Alton: 32/100 · Sioux Center: 44/100
Sioux Center is 12 points higher.
Flood
Alton: 59/100 · Sioux Center: 60/100
Sioux Center is 1 points higher.
Alton: FEMA NFHL flood zones: 9 features intersect this tile.
Sioux Center: FEMA NFHL flood zones: 2 features intersect this tile.
Wind
Alton: 20/100 · Sioux Center: 20/100
No gap.
Alton: Wind exposure derived from ingested design wind / climatology tiles.
Sioux Center: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Alton: 51/100 · Sioux Center: 51/100
No gap.
Alton: Lightning exposure derived from ingested climatology tiles.
Sioux Center: Lightning exposure derived from ingested climatology tiles.
Tornado
Alton: 8/100 · Sioux Center: 19/100
Sioux Center is 11 points higher.
Alton: Tornado risk derived from NOAA SPC historical reports.
Sioux Center: Tornado risk derived from NOAA SPC historical reports.
Hail
Alton: 34/100 · Sioux Center: 100/100
Sioux Center is 66 points higher.
Alton: Hail risk derived from NOAA SPC historical reports.
Sioux Center: Hail risk derived from NOAA SPC historical reports.
Storm surge
Alton: Unavailable · Sioux Center: Unavailable
A score difference cannot be calculated without both sources.
Alton: Storm surge model is not available for this location yet.
Sioux Center: Storm surge model is not available for this location yet.
Wildfire
Alton: 29/100 · Sioux Center: 33/100
Sioux Center is 4 points higher.
Alton: Wildfire exposure derived from ingested fire potential tiles.
Sioux Center: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Alton: 24/100 · Sioux Center: 23/100
Alton is 1 points higher.
Alton: 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 Center: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.