City vs city
Palo Alto vs Portola Valley, CA
Palo Alto currently scores 3 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
Palo Alto: 25/100 · Portola Valley: 22/100
Palo Alto is 3 points higher.
Flood
Palo Alto: 53/100 · Portola Valley: 28/100
Palo Alto is 25 points higher.
Palo Alto: FEMA NFHL flood zones: 5 features intersect this tile.
Portola Valley: FEMA NFHL flood zones: 2 features intersect this tile.
Wind
Palo Alto: 2/100 · Portola Valley: 2/100
No gap.
Palo Alto: Wind exposure derived from ingested design wind / climatology tiles.
Portola Valley: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Palo Alto: 0/100 · Portola Valley: 0/100
No gap.
Palo Alto: Lightning exposure derived from ingested climatology tiles.
Portola Valley: Lightning exposure derived from ingested climatology tiles.
Tornado
Palo Alto: 23/100 · Portola Valley: 0/100
Palo Alto is 23 points higher.
Palo Alto: Tornado risk derived from NOAA SPC historical reports.
Portola Valley: Tornado risk derived from NOAA SPC historical reports.
Hail
Palo Alto: 1/100 · Portola Valley: 1/100
No gap.
Palo Alto: Hail risk derived from NOAA SPC historical reports.
Portola Valley: Hail risk derived from NOAA SPC historical reports.
Storm surge
Palo Alto: Unavailable · Portola Valley: Unavailable
A score difference cannot be calculated without both sources.
Palo Alto: Storm surge model is not available for this location yet.
Portola Valley: Storm surge model is not available for this location yet.
Wildfire
Palo Alto: 47/100 · Portola Valley: 59/100
Portola Valley is 12 points higher.
Palo Alto: Wildfire exposure derived from ingested fire potential tiles.
Portola Valley: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Palo Alto: 23/100 · Portola Valley: 22/100
Palo Alto is 1 points higher.
Palo Alto: 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.