City vs city
Groveton vs Portsmouth, NH
Portsmouth currently scores 14 points higher overall than Groveton, 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
Groveton: 27/100 · Portsmouth: 41/100
Portsmouth is 14 points higher.
Flood
Groveton: 63/100 · Portsmouth: 73/100
Portsmouth is 10 points higher.
Groveton: FEMA NFHL flood zones: 7 features intersect this tile.
Portsmouth: FEMA NFHL flood zones: 12 features intersect this tile.
Wind
Groveton: 16/100 · Portsmouth: 23/100
Portsmouth is 7 points higher.
Groveton: Wind exposure derived from ingested design wind / climatology tiles.
Portsmouth: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Groveton: 8/100 · Portsmouth: 6/100
Groveton is 2 points higher.
Groveton: Lightning exposure derived from ingested climatology tiles.
Portsmouth: Lightning exposure derived from ingested climatology tiles.
Tornado
Groveton: 0/100 · Portsmouth: 0/100
No gap.
Groveton: Tornado risk derived from NOAA SPC historical reports.
Portsmouth: Tornado risk derived from NOAA SPC historical reports.
Hail
Groveton: 14/100 · Portsmouth: 22/100
Portsmouth is 8 points higher.
Groveton: Hail risk derived from NOAA SPC historical reports.
Portsmouth: Hail risk derived from NOAA SPC historical reports.
Storm surge
Groveton: Unavailable · Portsmouth: 98/100
A score difference cannot be calculated without both sources.
Groveton: Storm surge model is not available for this location yet.
Portsmouth: Storm surge exposure derived from NOAA SLOSH MOM (AGL) data.
Wildfire
Groveton: 34/100 · Portsmouth: 43/100
Portsmouth is 9 points higher.
Groveton: Wildfire exposure derived from ingested fire potential tiles.
Portsmouth: Wildfire exposure derived from ingested fire potential tiles.
Current air quality
Groveton: 26/100 · Portsmouth: 23/100
Groveton is 3 points higher.
Groveton: 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.