City vs city
Dover vs Portsmouth, NH
Portsmouth currently scores 4 points higher overall than Dover, 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
Dover: 37/100 · Portsmouth: 41/100
Portsmouth is 4 points higher.
Flood
Dover: 67/100 · Portsmouth: 73/100
Portsmouth is 6 points higher.
Dover: FEMA NFHL flood zones: 9 features intersect this tile.
Portsmouth: FEMA NFHL flood zones: 12 features intersect this tile.
Wind
Dover: 22/100 · Portsmouth: 23/100
Portsmouth is 1 points higher.
Dover: Wind exposure derived from ingested design wind / climatology tiles.
Portsmouth: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Dover: 6/100 · Portsmouth: 6/100
No gap.
Dover: Lightning exposure derived from ingested climatology tiles.
Portsmouth: Lightning exposure derived from ingested climatology tiles.
Tornado
Dover: 15/100 · Portsmouth: 0/100
Dover is 15 points higher.
Dover: Tornado risk derived from NOAA SPC historical reports.
Portsmouth: Tornado risk derived from NOAA SPC historical reports.
Hail
Dover: 20/100 · Portsmouth: 22/100
Portsmouth is 2 points higher.
Dover: Hail risk derived from NOAA SPC historical reports.
Portsmouth: Hail risk derived from NOAA SPC historical reports.
Storm surge
Dover: 96/100 · Portsmouth: 98/100
Portsmouth is 2 points higher.
Dover: Storm surge exposure derived from NOAA SLOSH MOM (AGL) data.
Portsmouth: Storm surge exposure derived from NOAA SLOSH MOM (AGL) data.
Wildfire
Dover: 49/100 · Portsmouth: 43/100
Dover is 6 points higher.
Dover: Wildfire exposure derived from ingested fire potential tiles.
Portsmouth: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Dover: 23/100 · Portsmouth: 23/100
No gap.
Dover: 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.