City vs city
Alta vs San Francisco, CA
Alta currently scores 18 points higher overall than San Francisco, 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: 43/100 · San Francisco: 25/100
Alta is 18 points higher.
Flood
Alta: 26/100 · San Francisco: 26/100
No gap.
Alta: FEMA NFHL flood zones: 5 features intersect this tile.
San Francisco: FEMA NFHL flood zones: 4 features intersect this tile.
Wind
Alta: 5/100 · San Francisco: 2/100
Alta is 3 points higher.
Alta: Wind exposure derived from ingested design wind / climatology tiles.
San Francisco: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Alta: 2/100 · San Francisco: 0/100
Alta is 2 points higher.
Alta: Lightning exposure derived from ingested climatology tiles.
San Francisco: Lightning exposure derived from ingested climatology tiles.
Tornado
Alta: 0/100 · San Francisco: 0/100
No gap.
Alta: Tornado risk derived from NOAA SPC historical reports.
San Francisco: Tornado risk derived from NOAA SPC historical reports.
Hail
Alta: 0/100 · San Francisco: 18/100
San Francisco is 18 points higher.
Alta: Hail risk derived from NOAA SPC historical reports.
San Francisco: Hail risk derived from NOAA SPC historical reports.
Storm surge
Alta: Unavailable · San Francisco: Unavailable
A score difference cannot be calculated without both sources.
Alta: Storm surge model is not available for this location yet.
San Francisco: Storm surge model is not available for this location yet.
Wildfire
Alta: 80/100 · San Francisco: 52/100
Alta is 28 points higher.
Alta: Wildfire exposure derived from ingested fire potential tiles.
San Francisco: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Alta: 100/100 · San Francisco: 25/100
Alta is 75 points higher.
Alta: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.
San Francisco: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.