City vs city
St. Clair vs Union, MO
Union currently scores 7 points higher overall than St. Clair, with the largest gap in tornado.
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
St. Clair: 40/100 · Union: 47/100
Union is 7 points higher.
Flood
St. Clair: 51/100 · Union: 50/100
St. Clair is 1 points higher.
St. Clair: FEMA NFHL flood zones: 10 features intersect this tile.
Union: FEMA NFHL flood zones: 14 features intersect this tile.
Wind
St. Clair: 16/100 · Union: 16/100
No gap.
St. Clair: Wind exposure derived from ingested design wind / climatology tiles.
Union: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
St. Clair: 52/100 · Union: 51/100
St. Clair is 1 points higher.
St. Clair: Lightning exposure derived from ingested climatology tiles.
Union: Lightning exposure derived from ingested climatology tiles.
Tornado
St. Clair: 12/100 · Union: 42/100
Union is 30 points higher.
St. Clair: Tornado risk derived from NOAA SPC historical reports.
Union: Tornado risk derived from NOAA SPC historical reports.
Hail
St. Clair: 84/100 · Union: 100/100
Union is 16 points higher.
St. Clair: Hail risk derived from NOAA SPC historical reports.
Union: Hail risk derived from NOAA SPC historical reports.
Storm surge
St. Clair: Unavailable · Union: Unavailable
A score difference cannot be calculated without both sources.
St. Clair: Storm surge model is not available for this location yet.
Union: Storm surge model is not available for this location yet.
Wildfire
St. Clair: 41/100 · Union: 46/100
Union is 5 points higher.
St. Clair: Wildfire exposure derived from ingested fire potential tiles.
Union: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
St. Clair: 27/100 · Union: 27/100
No gap.
St. Clair: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.
Union: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.