City vs city
Gann Valley vs Rapid City, SD
Rapid City currently scores 17 points higher overall than Gann 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
Gann Valley: 25/100 · Rapid City: 42/100
Rapid City is 17 points higher.
Flood
Gann Valley: Unavailable · Rapid City: 49/100
A score difference cannot be calculated without both sources.
Gann Valley: Flood model is not available for this location yet.
Rapid City: FEMA NFHL flood zones: 5 features intersect this tile.
Wind
Gann Valley: 22/100 · Rapid City: 20/100
Gann Valley is 2 points higher.
Gann Valley: Wind exposure derived from ingested design wind / climatology tiles.
Rapid City: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Gann Valley: 36/100 · Rapid City: 24/100
Gann Valley is 12 points higher.
Gann Valley: Lightning exposure derived from ingested climatology tiles.
Rapid City: Lightning exposure derived from ingested climatology tiles.
Tornado
Gann Valley: 12/100 · Rapid City: 8/100
Gann Valley is 4 points higher.
Gann Valley: Tornado risk derived from NOAA SPC historical reports.
Rapid City: Tornado risk derived from NOAA SPC historical reports.
Hail
Gann Valley: 28/100 · Rapid City: 100/100
Rapid City is 72 points higher.
Gann Valley: Hail risk derived from NOAA SPC historical reports.
Rapid City: Hail risk derived from NOAA SPC historical reports.
Storm surge
Gann Valley: Unavailable · Rapid City: Unavailable
A score difference cannot be calculated without both sources.
Gann Valley: Storm surge model is not available for this location yet.
Rapid City: Storm surge model is not available for this location yet.
Wildfire
Gann Valley: 49/100 · Rapid City: 67/100
Rapid City is 18 points higher.
Gann Valley: Wildfire exposure derived from ingested fire potential tiles.
Rapid City: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Gann Valley: Unavailable · Rapid City: 29/100
A score difference cannot be calculated without both sources.
Gann Valley: Air quality model is not available for this location yet.
Rapid City: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.