City vs city
Grand Isle vs South Portland, ME
South Portland currently scores 13 points higher overall than Grand Isle, with the largest gap in ingested air quality.
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
Grand Isle: 20/100 · South Portland: 33/100
South Portland is 13 points higher.
Flood
Grand Isle: Unavailable · South Portland: 39/100
A score difference cannot be calculated without both sources.
Grand Isle: Flood model is not available for this location yet.
South Portland: FEMA NFHL flood zones: 16 features intersect this tile.
Wind
Grand Isle: 10/100 · South Portland: 20/100
South Portland is 10 points higher.
Grand Isle: Wind exposure derived from ingested design wind / climatology tiles.
South Portland: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Grand Isle: 8/100 · South Portland: 4/100
Grand Isle is 4 points higher.
Grand Isle: Lightning exposure derived from ingested climatology tiles.
South Portland: Lightning exposure derived from ingested climatology tiles.
Tornado
Grand Isle: 0/100 · South Portland: 0/100
No gap.
Grand Isle: Tornado risk derived from NOAA SPC historical reports.
South Portland: Tornado risk derived from NOAA SPC historical reports.
Hail
Grand Isle: 4/100 · South Portland: 31/100
South Portland is 27 points higher.
Grand Isle: Hail risk derived from NOAA SPC historical reports.
South Portland: Hail risk derived from NOAA SPC historical reports.
Storm surge
Grand Isle: Unavailable · South Portland: 99/100
A score difference cannot be calculated without both sources.
Grand Isle: Storm surge model is not available for this location yet.
South Portland: Storm surge exposure derived from NOAA SLOSH MOM (AGL) data.
Wildfire
Grand Isle: Unavailable · South Portland: 9/100
A score difference cannot be calculated without both sources.
Grand Isle: Wildfire model is not available for this location yet.
South Portland: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Grand Isle: 76/100 · South Portland: 26/100
Grand Isle is 50 points higher.
Grand Isle: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.
South Portland: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.