City vs city
East Merrimack vs Portsmouth, NH
Portsmouth currently scores 7 points higher overall than East Merrimack, 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
East Merrimack: 34/100 · Portsmouth: 41/100
Portsmouth is 7 points higher.
Flood
East Merrimack: 100/100 · Portsmouth: 73/100
East Merrimack is 27 points higher.
East Merrimack: FEMA NFHL flood zones: 29 features intersect this tile.
Portsmouth: FEMA NFHL flood zones: 12 features intersect this tile.
Wind
East Merrimack: 22/100 · Portsmouth: 23/100
Portsmouth is 1 points higher.
East Merrimack: Wind exposure derived from ingested design wind / climatology tiles.
Portsmouth: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
East Merrimack: 7/100 · Portsmouth: 6/100
East Merrimack is 1 points higher.
East Merrimack: Lightning exposure derived from ingested climatology tiles.
Portsmouth: Lightning exposure derived from ingested climatology tiles.
Tornado
East Merrimack: 8/100 · Portsmouth: 0/100
East Merrimack is 8 points higher.
East Merrimack: Tornado risk derived from NOAA SPC historical reports.
Portsmouth: Tornado risk derived from NOAA SPC historical reports.
Hail
East Merrimack: 26/100 · Portsmouth: 22/100
East Merrimack is 4 points higher.
East Merrimack: Hail risk derived from NOAA SPC historical reports.
Portsmouth: Hail risk derived from NOAA SPC historical reports.
Storm surge
East Merrimack: Unavailable · Portsmouth: 98/100
A score difference cannot be calculated without both sources.
East Merrimack: Storm surge model is not available for this location yet.
Portsmouth: Storm surge exposure derived from NOAA SLOSH MOM (AGL) data.
Wildfire
East Merrimack: 55/100 · Portsmouth: 43/100
East Merrimack is 12 points higher.
East Merrimack: Wildfire exposure derived from ingested fire potential tiles.
Portsmouth: Wildfire exposure derived from ingested fire potential tiles.
Current air quality
East Merrimack: 20/100 · Portsmouth: 23/100
Portsmouth is 3 points higher.
East Merrimack: 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.