City vs city
Cupertino vs Portola Valley, CA
Cupertino currently scores 7 points higher overall than Portola Valley, with the largest gap in flood.
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
Cupertino: 29/100 · Portola Valley: 22/100
Cupertino is 7 points higher.
Flood
Cupertino: 52/100 · Portola Valley: 28/100
Cupertino is 24 points higher.
Cupertino: FEMA NFHL flood zones: 16 features intersect this tile.
Portola Valley: FEMA NFHL flood zones: 2 features intersect this tile.
Wind
Cupertino: 2/100 · Portola Valley: 2/100
No gap.
Cupertino: Wind exposure derived from ingested design wind / climatology tiles.
Portola Valley: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Cupertino: 0/100 · Portola Valley: 0/100
No gap.
Cupertino: Lightning exposure derived from ingested climatology tiles.
Portola Valley: Lightning exposure derived from ingested climatology tiles.
Tornado
Cupertino: 19/100 · Portola Valley: 0/100
Cupertino is 19 points higher.
Cupertino: Tornado risk derived from NOAA SPC historical reports.
Portola Valley: Tornado risk derived from NOAA SPC historical reports.
Hail
Cupertino: 11/100 · Portola Valley: 1/100
Cupertino is 10 points higher.
Cupertino: Hail risk derived from NOAA SPC historical reports.
Portola Valley: Hail risk derived from NOAA SPC historical reports.
Storm surge
Cupertino: Unavailable · Portola Valley: Unavailable
A score difference cannot be calculated without both sources.
Cupertino: Storm surge model is not available for this location yet.
Portola Valley: Storm surge model is not available for this location yet.
Wildfire
Cupertino: 63/100 · Portola Valley: 59/100
Cupertino is 4 points higher.
Cupertino: Wildfire exposure derived from ingested fire potential tiles.
Portola Valley: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Cupertino: 26/100 · Portola Valley: 22/100
Cupertino is 4 points higher.
Cupertino: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.
Portola Valley: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.