City vs city
Grenville vs Webster, SD
Grenville currently scores 5 points higher overall than Webster, 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
Grenville: 33/100 · Webster: 28/100
Grenville is 5 points higher.
Flood
Grenville: 100/100 · Webster: 44/100
Grenville is 56 points higher.
Grenville: FEMA NFHL flood zones: 13 features intersect this tile.
Webster: FEMA NFHL flood zones: 5 features intersect this tile.
Wind
Grenville: 20/100 · Webster: 20/100
No gap.
Grenville: Wind exposure derived from ingested design wind / climatology tiles.
Webster: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Grenville: 32/100 · Webster: 33/100
Webster is 1 points higher.
Grenville: Lightning exposure derived from ingested climatology tiles.
Webster: Lightning exposure derived from ingested climatology tiles.
Tornado
Grenville: 12/100 · Webster: 4/100
Grenville is 8 points higher.
Grenville: Tornado risk derived from NOAA SPC historical reports.
Webster: Tornado risk derived from NOAA SPC historical reports.
Hail
Grenville: 34/100 · Webster: 49/100
Webster is 15 points higher.
Grenville: Hail risk derived from NOAA SPC historical reports.
Webster: Hail risk derived from NOAA SPC historical reports.
Storm surge
Grenville: Unavailable · Webster: Unavailable
A score difference cannot be calculated without both sources.
Grenville: Storm surge model is not available for this location yet.
Webster: Storm surge model is not available for this location yet.
Wildfire
Grenville: 10/100 · Webster: 29/100
Webster is 19 points higher.
Grenville: Wildfire exposure derived from ingested fire potential tiles.
Webster: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Grenville: 21/100 · Webster: 20/100
Grenville is 1 points higher.
Grenville: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.
Webster: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.