City vs city
Portola Valley vs Redwood City, CA
Redwood City currently scores 6 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
Portola Valley: 22/100 · Redwood City: 28/100
Redwood City is 6 points higher.
Flood
Portola Valley: 28/100 · Redwood City: 56/100
Redwood City is 28 points higher.
Portola Valley: FEMA NFHL flood zones: 2 features intersect this tile.
Redwood City: FEMA NFHL flood zones: 21 features intersect this tile.
Wind
Portola Valley: 2/100 · Redwood City: 2/100
No gap.
Portola Valley: Wind exposure derived from ingested design wind / climatology tiles.
Redwood City: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Portola Valley: 0/100 · Redwood City: 0/100
No gap.
Portola Valley: Lightning exposure derived from ingested climatology tiles.
Redwood City: Lightning exposure derived from ingested climatology tiles.
Tornado
Portola Valley: 0/100 · Redwood City: 0/100
No gap.
Portola Valley: Tornado risk derived from NOAA SPC historical reports.
Redwood City: Tornado risk derived from NOAA SPC historical reports.
Hail
Portola Valley: 1/100 · Redwood City: 5/100
Redwood City is 4 points higher.
Portola Valley: Hail risk derived from NOAA SPC historical reports.
Redwood City: Hail risk derived from NOAA SPC historical reports.
Storm surge
Portola Valley: Unavailable · Redwood City: Unavailable
A score difference cannot be calculated without both sources.
Portola Valley: Storm surge model is not available for this location yet.
Redwood City: Storm surge model is not available for this location yet.
Wildfire
Portola Valley: 59/100 · Redwood City: 53/100
Portola Valley is 6 points higher.
Portola Valley: Wildfire exposure derived from ingested fire potential tiles.
Redwood City: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Portola Valley: 22/100 · Redwood City: 22/100
No gap.
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.
Redwood City: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.