City vs city
Alton vs Jerseyville, IL
Jerseyville currently scores 3 points higher overall than Alton, with the largest gap in flood.
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 · Jerseyville: 37/100
Jerseyville is 3 points higher.
Flood
Alton: 0/100 · Jerseyville: 33/100
Jerseyville is 33 points higher.
Alton: FEMA NFHL flood zones: 0 features intersect this tile.
Jerseyville: FEMA NFHL flood zones: 2 features intersect this tile.
Wind
Alton: 16/100 · Jerseyville: 16/100
No gap.
Alton: Wind exposure derived from ingested design wind / climatology tiles.
Jerseyville: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Alton: 53/100 · Jerseyville: 53/100
No gap.
Alton: Lightning exposure derived from ingested climatology tiles.
Jerseyville: Lightning exposure derived from ingested climatology tiles.
Tornado
Alton: 27/100 · Jerseyville: 42/100
Jerseyville is 15 points higher.
Alton: Tornado risk derived from NOAA SPC historical reports.
Jerseyville: Tornado risk derived from NOAA SPC historical reports.
Hail
Alton: 91/100 · Jerseyville: 76/100
Alton is 15 points higher.
Alton: Hail risk derived from NOAA SPC historical reports.
Jerseyville: Hail risk derived from NOAA SPC historical reports.
Storm surge
Alton: Unavailable · Jerseyville: Unavailable
A score difference cannot be calculated without both sources.
Alton: Storm surge model is not available for this location yet.
Jerseyville: Storm surge model is not available for this location yet.
Wildfire
Alton: 16/100 · Jerseyville: 12/100
Alton is 4 points higher.
Alton: Wildfire exposure derived from ingested fire potential tiles.
Jerseyville: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Alton: 35/100 · Jerseyville: 27/100
Alton is 8 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.
Jerseyville: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.