City vs city
Alton vs St. Louis, MO
Alton currently scores 1 points higher overall than St. Louis, 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
Alton: 39/100 · St. Louis: 38/100
Alton is 1 points higher.
Flood
Alton: 43/100 · St. Louis: 32/100
Alton is 11 points higher.
Alton: FEMA NFHL flood zones: 2 features intersect this tile.
St. Louis: FEMA NFHL flood zones: 4 features intersect this tile.
Wind
Alton: 15/100 · St. Louis: 16/100
St. Louis is 1 points higher.
Alton: Wind exposure derived from ingested design wind / climatology tiles.
St. Louis: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Alton: 94/100 · St. Louis: 39/100
Alton is 55 points higher.
Alton: Lightning exposure derived from ingested climatology tiles.
St. Louis: Lightning exposure derived from ingested climatology tiles.
Tornado
Alton: 4/100 · St. Louis: 15/100
St. Louis is 11 points higher.
Alton: Tornado risk derived from NOAA SPC historical reports.
St. Louis: Tornado risk derived from NOAA SPC historical reports.
Hail
Alton: 50/100 · St. Louis: 100/100
St. Louis is 50 points higher.
Alton: Hail risk derived from NOAA SPC historical reports.
St. Louis: Hail risk derived from NOAA SPC historical reports.
Storm surge
Alton: Unavailable · St. Louis: Unavailable
A score difference cannot be calculated without both sources.
Alton: Storm surge model is not available for this location yet.
St. Louis: Storm surge model is not available for this location yet.
Wildfire
Alton: 39/100 · St. Louis: 38/100
Alton is 1 points higher.
Alton: Wildfire exposure derived from ingested fire potential tiles.
St. Louis: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Alton: 26/100 · St. Louis: 27/100
St. Louis 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.
St. Louis: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.