City vs city
Johnston vs Polk City, IA
Johnston currently scores 4 points higher overall than Polk City, 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 is a current EPA AirNow signal; 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: 51/100 · Polk City: 47/100
Johnston is 4 points higher.
Flood
Johnston: 52/100 · Polk City: 82/100
Polk City is 30 points higher.
Johnston: FEMA NFHL flood zones: 8 features intersect this tile.
Polk City: FEMA NFHL flood zones: 8 features intersect this tile.
Wind
Johnston: 18/100 · Polk City: 18/100
No gap.
Johnston: Wind exposure derived from ingested design wind / climatology tiles.
Polk City: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Johnston: 58/100 · Polk City: 58/100
No gap.
Johnston: Lightning exposure derived from ingested climatology tiles.
Polk City: Lightning exposure derived from ingested climatology tiles.
Tornado
Johnston: 73/100 · Polk City: 15/100
Johnston is 58 points higher.
Johnston: Tornado risk derived from NOAA SPC historical reports.
Polk City: Tornado risk derived from NOAA SPC historical reports.
Hail
Johnston: 100/100 · Polk City: 100/100
No gap.
Johnston: Hail risk derived from NOAA SPC historical reports.
Polk City: Hail risk derived from NOAA SPC historical reports.
Storm surge
Johnston: Unavailable · Polk City: Unavailable
A score difference cannot be calculated without both sources.
Johnston: Storm surge model is not available for this location yet.
Polk City: Storm surge model is not available for this location yet.
Wildfire
Johnston: 24/100 · Polk City: 28/100
Polk City is 4 points higher.
Johnston: Wildfire exposure derived from ingested fire potential tiles.
Polk City: Wildfire exposure derived from ingested fire potential tiles.
Current air quality
Johnston: 30/100 · Polk City: 30/100
No gap.
Johnston: Air quality signal derived from the latest EPA AirNow combined AQI grid.
Polk City: Air quality signal derived from the latest EPA AirNow combined AQI grid.