City vs city
San Francisco vs Twain, CA
Twain currently scores 6 points higher overall than San Francisco, with the largest gap in wildfire.
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
San Francisco: 19/100 · Twain: 25/100
Twain is 6 points higher.
Flood
San Francisco: 56/100 · Twain: 26/100
San Francisco is 30 points higher.
San Francisco: FEMA NFHL flood zones: 16 features intersect this tile.
Twain: FEMA NFHL flood zones: 2 features intersect this tile.
Wind
San Francisco: 2/100 · Twain: 5/100
Twain is 3 points higher.
San Francisco: Wind exposure derived from ingested design wind / climatology tiles.
Twain: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
San Francisco: 0/100 · Twain: 2/100
Twain is 2 points higher.
San Francisco: Lightning exposure derived from ingested climatology tiles.
Twain: Lightning exposure derived from ingested climatology tiles.
Tornado
San Francisco: 0/100 · Twain: 0/100
No gap.
San Francisco: Tornado risk derived from NOAA SPC historical reports.
Twain: Tornado risk derived from NOAA SPC historical reports.
Hail
San Francisco: 3/100 · Twain: 1/100
San Francisco is 2 points higher.
San Francisco: Hail risk derived from NOAA SPC historical reports.
Twain: Hail risk derived from NOAA SPC historical reports.
Storm surge
San Francisco: Unavailable · Twain: Unavailable
A score difference cannot be calculated without both sources.
San Francisco: Storm surge model is not available for this location yet.
Twain: Storm surge model is not available for this location yet.
Wildfire
San Francisco: 8/100 · Twain: 97/100
Twain is 89 points higher.
San Francisco: Wildfire exposure derived from ingested fire potential tiles.
Twain: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
San Francisco: 25/100 · Twain: 17/100
San Francisco is 8 points higher.
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.
Twain: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.