City vs city
Portsmouth vs Seabrook Beach, NH
Portsmouth currently scores 2 points higher overall than Seabrook Beach, 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 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
Portsmouth: 41/100 · Seabrook Beach: 39/100
Portsmouth is 2 points higher.
Flood
Portsmouth: 73/100 · Seabrook Beach: 40/100
Portsmouth is 33 points higher.
Portsmouth: FEMA NFHL flood zones: 12 features intersect this tile.
Seabrook Beach: FEMA NFHL flood zones: 6 features intersect this tile.
Wind
Portsmouth: 23/100 · Seabrook Beach: 24/100
Seabrook Beach is 1 points higher.
Portsmouth: Wind exposure derived from ingested design wind / climatology tiles.
Seabrook Beach: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Portsmouth: 6/100 · Seabrook Beach: 8/100
Seabrook Beach is 2 points higher.
Portsmouth: Lightning exposure derived from ingested climatology tiles.
Seabrook Beach: Lightning exposure derived from ingested climatology tiles.
Tornado
Portsmouth: 0/100 · Seabrook Beach: 0/100
No gap.
Portsmouth: Tornado risk derived from NOAA SPC historical reports.
Seabrook Beach: Tornado risk derived from NOAA SPC historical reports.
Hail
Portsmouth: 22/100 · Seabrook Beach: 40/100
Seabrook Beach is 18 points higher.
Portsmouth: Hail risk derived from NOAA SPC historical reports.
Seabrook Beach: Hail risk derived from NOAA SPC historical reports.
Storm surge
Portsmouth: 98/100 · Seabrook Beach: 98/100
No gap.
Portsmouth: Storm surge exposure derived from NOAA SLOSH MOM (AGL) data.
Seabrook Beach: Storm surge exposure derived from NOAA SLOSH MOM (AGL) data.
Wildfire
Portsmouth: 43/100 · Seabrook Beach: 44/100
Seabrook Beach is 1 points higher.
Portsmouth: Wildfire exposure derived from ingested fire potential tiles.
Seabrook Beach: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Portsmouth: 23/100 · Seabrook Beach: 22/100
Portsmouth is 1 points higher.
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.
Seabrook Beach: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.