City vs city
Riverside vs St. Helena, CA
Riverside currently scores 9 points higher overall than St. Helena, 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
Riverside: 32/100 · St. Helena: 23/100
Riverside is 9 points higher.
Flood
Riverside: 43/100 · St. Helena: 31/100
Riverside is 12 points higher.
Riverside: FEMA NFHL flood zones: 23 features intersect this tile.
St. Helena: FEMA NFHL flood zones: 4 features intersect this tile.
Wind
Riverside: 5/100 · St. Helena: 2/100
Riverside is 3 points higher.
Riverside: Wind exposure derived from ingested design wind / climatology tiles.
St. Helena: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Riverside: 2/100 · St. Helena: 0/100
Riverside is 2 points higher.
Riverside: Lightning exposure derived from ingested climatology tiles.
St. Helena: Lightning exposure derived from ingested climatology tiles.
Tornado
Riverside: 0/100 · St. Helena: 0/100
No gap.
Riverside: Tornado risk derived from NOAA SPC historical reports.
St. Helena: Tornado risk derived from NOAA SPC historical reports.
Hail
Riverside: 0/100 · St. Helena: 1/100
St. Helena is 1 points higher.
Riverside: Hail risk derived from NOAA SPC historical reports.
St. Helena: Hail risk derived from NOAA SPC historical reports.
Storm surge
Riverside: Unavailable · St. Helena: Unavailable
A score difference cannot be calculated without both sources.
Riverside: Storm surge model is not available for this location yet.
St. Helena: Storm surge model is not available for this location yet.
Wildfire
Riverside: 76/100 · St. Helena: 56/100
Riverside is 20 points higher.
Riverside: Wildfire exposure derived from ingested fire potential tiles.
St. Helena: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Riverside: 32/100 · St. Helena: 26/100
Riverside is 6 points higher.
Riverside: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.
St. Helena: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.