City vs city
Johnston vs Sioux City, IA
Johnston currently scores 12 points higher overall than Sioux City, 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 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 · Sioux City: 39/100
Johnston is 12 points higher.
Flood
Johnston: 52/100 · Sioux City: 4/100
Johnston is 48 points higher.
Johnston: FEMA NFHL flood zones: 8 features intersect this tile.
Sioux City: FEMA NFHL flood zones: 2 features intersect this tile.
Wind
Johnston: 18/100 · Sioux City: 20/100
Sioux City is 2 points higher.
Johnston: Wind exposure derived from ingested design wind / climatology tiles.
Sioux City: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Johnston: 58/100 · Sioux City: 52/100
Johnston is 6 points higher.
Johnston: Lightning exposure derived from ingested climatology tiles.
Sioux City: Lightning exposure derived from ingested climatology tiles.
Tornado
Johnston: 73/100 · Sioux City: 38/100
Johnston is 35 points higher.
Johnston: Tornado risk derived from NOAA SPC historical reports.
Sioux City: Tornado risk derived from NOAA SPC historical reports.
Hail
Johnston: 100/100 · Sioux City: 86/100
Johnston is 14 points higher.
Johnston: Hail risk derived from NOAA SPC historical reports.
Sioux City: Hail risk derived from NOAA SPC historical reports.
Storm surge
Johnston: Unavailable · Sioux City: Unavailable
A score difference cannot be calculated without both sources.
Johnston: Storm surge model is not available for this location yet.
Sioux City: Storm surge model is not available for this location yet.
Wildfire
Johnston: 24/100 · Sioux City: 48/100
Sioux City is 24 points higher.
Johnston: Wildfire exposure derived from ingested fire potential tiles.
Sioux City: Wildfire exposure derived from ingested fire potential tiles.
Current air quality
Johnston: 30/100 · Sioux City: 26/100
Johnston is 4 points higher.
Johnston: Air quality signal derived from the latest EPA AirNow combined AQI grid.
Sioux City: Air quality signal derived from the latest EPA AirNow combined AQI grid.