City vs city
Dayton vs Portsmouth, OH
Portsmouth currently scores 1 points higher overall than Dayton, with the largest gap in wildfire.
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
Dayton: 45/100 · Portsmouth: 46/100
Portsmouth is 1 points higher.
Flood
Dayton: 74/100 · Portsmouth: 41/100
Dayton is 33 points higher.
Dayton: FEMA NFHL flood zones: 9 features intersect this tile.
Portsmouth: FEMA NFHL flood zones: 6 features intersect this tile.
Wind
Dayton: 15/100 · Portsmouth: 15/100
No gap.
Dayton: Wind exposure derived from ingested design wind / climatology tiles.
Portsmouth: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Dayton: 35/100 · Portsmouth: 34/100
Dayton is 1 points higher.
Dayton: Lightning exposure derived from ingested climatology tiles.
Portsmouth: Lightning exposure derived from ingested climatology tiles.
Tornado
Dayton: 46/100 · Portsmouth: 35/100
Dayton is 11 points higher.
Dayton: Tornado risk derived from NOAA SPC historical reports.
Portsmouth: Tornado risk derived from NOAA SPC historical reports.
Hail
Dayton: 100/100 · Portsmouth: 100/100
No gap.
Dayton: Hail risk derived from NOAA SPC historical reports.
Portsmouth: Hail risk derived from NOAA SPC historical reports.
Storm surge
Dayton: Unavailable · Portsmouth: Unavailable
A score difference cannot be calculated without both sources.
Dayton: Storm surge model is not available for this location yet.
Portsmouth: Storm surge model is not available for this location yet.
Wildfire
Dayton: 7/100 · Portsmouth: 58/100
Portsmouth is 51 points higher.
Dayton: Wildfire exposure derived from ingested fire potential tiles.
Portsmouth: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Dayton: 35/100 · Portsmouth: 41/100
Portsmouth is 6 points higher.
Dayton: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.
Portsmouth: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.