City vs city
Manchester vs Portsmouth, NH
Portsmouth currently scores 8 points higher overall than Manchester, 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 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
Manchester: 33/100 · Portsmouth: 41/100
Portsmouth is 8 points higher.
Flood
Manchester: 65/100 · Portsmouth: 73/100
Portsmouth is 8 points higher.
Manchester: FEMA NFHL flood zones: 18 features intersect this tile.
Portsmouth: FEMA NFHL flood zones: 12 features intersect this tile.
Wind
Manchester: 22/100 · Portsmouth: 23/100
Portsmouth is 1 points higher.
Manchester: Wind exposure derived from ingested design wind / climatology tiles.
Portsmouth: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Manchester: 8/100 · Portsmouth: 6/100
Manchester is 2 points higher.
Manchester: Lightning exposure derived from ingested climatology tiles.
Portsmouth: Lightning exposure derived from ingested climatology tiles.
Tornado
Manchester: 0/100 · Portsmouth: 0/100
No gap.
Manchester: Tornado risk derived from NOAA SPC historical reports.
Portsmouth: Tornado risk derived from NOAA SPC historical reports.
Hail
Manchester: 27/100 · Portsmouth: 22/100
Manchester is 5 points higher.
Manchester: Hail risk derived from NOAA SPC historical reports.
Portsmouth: Hail risk derived from NOAA SPC historical reports.
Storm surge
Manchester: Unavailable · Portsmouth: 98/100
A score difference cannot be calculated without both sources.
Manchester: Storm surge model is not available for this location yet.
Portsmouth: Storm surge exposure derived from NOAA SLOSH MOM (AGL) data.
Wildfire
Manchester: 55/100 · Portsmouth: 43/100
Manchester is 12 points higher.
Manchester: Wildfire exposure derived from ingested fire potential tiles.
Portsmouth: Wildfire exposure derived from ingested fire potential tiles.
Current air quality
Manchester: 20/100 · Portsmouth: 23/100
Portsmouth is 3 points higher.
Manchester: Air quality signal derived from the latest EPA AirNow combined AQI grid.
Portsmouth: Air quality signal derived from the latest EPA AirNow combined AQI grid.