City vs city
O'Fallon vs Salem, IL
O'Fallon currently scores 4 points higher overall than Salem, 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
O'Fallon: 40/100 · Salem: 36/100
O'Fallon is 4 points higher.
Flood
O'Fallon: Unavailable · Salem: 43/100
A score difference cannot be calculated without both sources.
O'Fallon: Flood model is not available for this location yet.
Salem: FEMA NFHL flood zones: 4 features intersect this tile.
Wind
O'Fallon: 16/100 · Salem: 15/100
O'Fallon is 1 points higher.
O'Fallon: Wind exposure derived from ingested design wind / climatology tiles.
Salem: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
O'Fallon: 35/100 · Salem: 50/100
Salem is 15 points higher.
O'Fallon: Lightning exposure derived from ingested climatology tiles.
Salem: Lightning exposure derived from ingested climatology tiles.
Tornado
O'Fallon: 73/100 · Salem: 15/100
O'Fallon is 58 points higher.
O'Fallon: Tornado risk derived from NOAA SPC historical reports.
Salem: Tornado risk derived from NOAA SPC historical reports.
Hail
O'Fallon: 100/100 · Salem: 85/100
O'Fallon is 15 points higher.
O'Fallon: Hail risk derived from NOAA SPC historical reports.
Salem: Hail risk derived from NOAA SPC historical reports.
Storm surge
O'Fallon: Unavailable · Salem: Unavailable
A score difference cannot be calculated without both sources.
O'Fallon: Storm surge model is not available for this location yet.
Salem: Storm surge model is not available for this location yet.
Wildfire
O'Fallon: 30/100 · Salem: 15/100
O'Fallon is 15 points higher.
O'Fallon: Wildfire exposure derived from ingested fire potential tiles.
Salem: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
O'Fallon: 29/100 · Salem: 30/100
Salem is 1 points higher.
O'Fallon: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.
Salem: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.