City vs city
Alton vs South Roxana, IL
South Roxana currently scores 4 points higher overall than Alton, 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
Alton: 34/100 · South Roxana: 38/100
South Roxana is 4 points higher.
Flood
Alton: 0/100 · South Roxana: Unavailable
A score difference cannot be calculated without both sources.
Alton: FEMA NFHL flood zones: 0 features intersect this tile.
South Roxana: Flood model is not available for this location yet.
Wind
Alton: 16/100 · South Roxana: 16/100
No gap.
Alton: Wind exposure derived from ingested design wind / climatology tiles.
South Roxana: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Alton: 53/100 · South Roxana: 48/100
Alton is 5 points higher.
Alton: Lightning exposure derived from ingested climatology tiles.
South Roxana: Lightning exposure derived from ingested climatology tiles.
Tornado
Alton: 27/100 · South Roxana: 42/100
South Roxana is 15 points higher.
Alton: Tornado risk derived from NOAA SPC historical reports.
South Roxana: Tornado risk derived from NOAA SPC historical reports.
Hail
Alton: 91/100 · South Roxana: 97/100
South Roxana is 6 points higher.
Alton: Hail risk derived from NOAA SPC historical reports.
South Roxana: Hail risk derived from NOAA SPC historical reports.
Storm surge
Alton: Unavailable · South Roxana: Unavailable
A score difference cannot be calculated without both sources.
Alton: Storm surge model is not available for this location yet.
South Roxana: Storm surge model is not available for this location yet.
Wildfire
Alton: 16/100 · South Roxana: 29/100
South Roxana is 13 points higher.
Alton: Wildfire exposure derived from ingested fire potential tiles.
South Roxana: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Alton: 35/100 · South Roxana: 33/100
Alton is 2 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.
South Roxana: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.