City vs city
Alameda vs South San Francisco, CA
Alameda and South San Francisco are tied on overall score, with the biggest factor difference 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
Alameda: 21/100 · South San Francisco: 21/100
No gap.
Flood
Alameda: 56/100 · South San Francisco: 31/100
Alameda is 25 points higher.
Alameda: FEMA NFHL flood zones: 20 features intersect this tile.
South San Francisco: FEMA NFHL flood zones: 9 features intersect this tile.
Wind
Alameda: 2/100 · South San Francisco: 2/100
No gap.
Alameda: Wind exposure derived from ingested design wind / climatology tiles.
South San Francisco: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Alameda: 0/100 · South San Francisco: 0/100
No gap.
Alameda: Lightning exposure derived from ingested climatology tiles.
South San Francisco: Lightning exposure derived from ingested climatology tiles.
Tornado
Alameda: 0/100 · South San Francisco: 8/100
South San Francisco is 8 points higher.
Alameda: Tornado risk derived from NOAA SPC historical reports.
South San Francisco: Tornado risk derived from NOAA SPC historical reports.
Hail
Alameda: 15/100 · South San Francisco: 5/100
Alameda is 10 points higher.
Alameda: Hail risk derived from NOAA SPC historical reports.
South San Francisco: Hail risk derived from NOAA SPC historical reports.
Storm surge
Alameda: Unavailable · South San Francisco: Unavailable
A score difference cannot be calculated without both sources.
Alameda: Storm surge model is not available for this location yet.
South San Francisco: Storm surge model is not available for this location yet.
Wildfire
Alameda: 10/100 · South San Francisco: 54/100
South San Francisco is 44 points higher.
Alameda: Wildfire exposure derived from ingested fire potential tiles.
South San Francisco: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Alameda: 24/100 · South San Francisco: 25/100
South San Francisco is 1 points higher.
Alameda: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.
South 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.