City vs city
Johnston City vs Mount Vernon, IL
Johnston City currently scores 19 points higher overall than Mount Vernon, 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
Johnston City: 48/100 · Mount Vernon: 29/100
Johnston City is 19 points higher.
Flood
Johnston City: 76/100 · Mount Vernon: 47/100
Johnston City is 29 points higher.
Johnston City: FEMA NFHL flood zones: 9 features intersect this tile.
Mount Vernon: FEMA NFHL flood zones: 4 features intersect this tile.
Wind
Johnston City: 15/100 · Mount Vernon: 15/100
No gap.
Johnston City: Wind exposure derived from ingested design wind / climatology tiles.
Mount Vernon: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Johnston City: 48/100 · Mount Vernon: 46/100
Johnston City is 2 points higher.
Johnston City: Lightning exposure derived from ingested climatology tiles.
Mount Vernon: Lightning exposure derived from ingested climatology tiles.
Tornado
Johnston City: 27/100 · Mount Vernon: 15/100
Johnston City is 12 points higher.
Johnston City: Tornado risk derived from NOAA SPC historical reports.
Mount Vernon: Tornado risk derived from NOAA SPC historical reports.
Hail
Johnston City: 100/100 · Mount Vernon: 29/100
Johnston City is 71 points higher.
Johnston City: Hail risk derived from NOAA SPC historical reports.
Mount Vernon: Hail risk derived from NOAA SPC historical reports.
Storm surge
Johnston City: Unavailable · Mount Vernon: Unavailable
A score difference cannot be calculated without both sources.
Johnston City: Storm surge model is not available for this location yet.
Mount Vernon: Storm surge model is not available for this location yet.
Wildfire
Johnston City: 39/100 · Mount Vernon: 19/100
Johnston City is 20 points higher.
Johnston City: Wildfire exposure derived from ingested fire potential tiles.
Mount Vernon: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Johnston City: 30/100 · Mount Vernon: 30/100
No gap.
Johnston City: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.
Mount Vernon: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.