City vs city
Shell Valley vs Williston, ND
Williston currently scores 6 points higher overall than Shell Valley, with the largest gap in hail.
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
Shell Valley: 29/100 · Williston: 35/100
Williston is 6 points higher.
Flood
Shell Valley: 36/100 · Williston: 41/100
Williston is 5 points higher.
Shell Valley: FEMA NFHL flood zones: 1 features intersect this tile.
Williston: FEMA NFHL flood zones: 5 features intersect this tile.
Wind
Shell Valley: 18/100 · Williston: 18/100
No gap.
Shell Valley: Wind exposure derived from ingested design wind / climatology tiles.
Williston: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Shell Valley: 6/100 · Williston: 19/100
Williston is 13 points higher.
Shell Valley: Lightning exposure derived from ingested climatology tiles.
Williston: Lightning exposure derived from ingested climatology tiles.
Tornado
Shell Valley: 0/100 · Williston: 4/100
Williston is 4 points higher.
Shell Valley: Tornado risk derived from NOAA SPC historical reports.
Williston: Tornado risk derived from NOAA SPC historical reports.
Hail
Shell Valley: 6/100 · Williston: 100/100
Williston is 94 points higher.
Shell Valley: Hail risk derived from NOAA SPC historical reports.
Williston: Hail risk derived from NOAA SPC historical reports.
Storm surge
Shell Valley: Unavailable · Williston: Unavailable
A score difference cannot be calculated without both sources.
Shell Valley: Storm surge model is not available for this location yet.
Williston: Storm surge model is not available for this location yet.
Wildfire
Shell Valley: 72/100 · Williston: 37/100
Shell Valley is 35 points higher.
Shell Valley: Wildfire exposure derived from ingested fire potential tiles.
Williston: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Shell Valley: 38/100 · Williston: 23/100
Shell Valley is 15 points higher.
Shell Valley: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.
Williston: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.