City vs city
Alta Sierra vs Riverside, CA
Alta Sierra currently scores 3 points higher overall than Riverside, 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
Alta Sierra: 35/100 · Riverside: 32/100
Alta Sierra is 3 points higher.
Flood
Alta Sierra: 26/100 · Riverside: 43/100
Riverside is 17 points higher.
Alta Sierra: FEMA NFHL flood zones: 1 features intersect this tile.
Riverside: FEMA NFHL flood zones: 23 features intersect this tile.
Wind
Alta Sierra: 4/100 · Riverside: 5/100
Riverside is 1 points higher.
Alta Sierra: Wind exposure derived from ingested design wind / climatology tiles.
Riverside: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Alta Sierra: 2/100 · Riverside: 2/100
No gap.
Alta Sierra: Lightning exposure derived from ingested climatology tiles.
Riverside: Lightning exposure derived from ingested climatology tiles.
Tornado
Alta Sierra: 0/100 · Riverside: 0/100
No gap.
Alta Sierra: Tornado risk derived from NOAA SPC historical reports.
Riverside: Tornado risk derived from NOAA SPC historical reports.
Hail
Alta Sierra: 1/100 · Riverside: 0/100
Alta Sierra is 1 points higher.
Alta Sierra: Hail risk derived from NOAA SPC historical reports.
Riverside: Hail risk derived from NOAA SPC historical reports.
Storm surge
Alta Sierra: Unavailable · Riverside: Unavailable
A score difference cannot be calculated without both sources.
Alta Sierra: Storm surge model is not available for this location yet.
Riverside: Storm surge model is not available for this location yet.
Wildfire
Alta Sierra: 77/100 · Riverside: 76/100
Alta Sierra is 1 points higher.
Alta Sierra: Wildfire exposure derived from ingested fire potential tiles.
Riverside: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Alta Sierra: 100/100 · Riverside: 32/100
Alta Sierra is 68 points higher.
Alta Sierra: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.
Riverside: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.