City vs city
Portsmouth vs Roanoke, VA
Portsmouth currently scores 3 points higher overall than Roanoke, 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
Portsmouth: 42/100 · Roanoke: 39/100
Portsmouth is 3 points higher.
Flood
Portsmouth: 44/100 · Roanoke: 24/100
Portsmouth is 20 points higher.
Portsmouth: FEMA NFHL flood zones: 27 features intersect this tile.
Roanoke: FEMA NFHL flood zones: 9 features intersect this tile.
Wind
Portsmouth: 26/100 · Roanoke: 17/100
Portsmouth is 9 points higher.
Portsmouth: Wind exposure derived from ingested design wind / climatology tiles.
Roanoke: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Portsmouth: 45/100 · Roanoke: 30/100
Portsmouth is 15 points higher.
Portsmouth: Lightning exposure derived from ingested climatology tiles.
Roanoke: Lightning exposure derived from ingested climatology tiles.
Tornado
Portsmouth: 19/100 · Roanoke: 19/100
No gap.
Portsmouth: Tornado risk derived from NOAA SPC historical reports.
Roanoke: Tornado risk derived from NOAA SPC historical reports.
Hail
Portsmouth: 76/100 · Roanoke: 100/100
Roanoke is 24 points higher.
Portsmouth: Hail risk derived from NOAA SPC historical reports.
Roanoke: Hail risk derived from NOAA SPC historical reports.
Storm surge
Portsmouth: 91/100 · Roanoke: Unavailable
A score difference cannot be calculated without both sources.
Portsmouth: Storm surge exposure derived from NOAA SLOSH MOM (AGL) data.
Roanoke: Storm surge model is not available for this location yet.
Wildfire
Portsmouth: 10/100 · Roanoke: 51/100
Roanoke is 41 points higher.
Portsmouth: Wildfire exposure derived from ingested fire potential tiles.
Roanoke: Wildfire exposure derived from ingested fire potential tiles.
Current air quality
Portsmouth: 25/100 · Roanoke: 35/100
Roanoke is 10 points higher.
Portsmouth: Air quality signal derived from the latest EPA AirNow combined AQI grid.
Roanoke: Air quality signal derived from the latest EPA AirNow combined AQI grid.