City vs city
Erwin vs Johnson City, TN
Johnson City currently scores 3 points higher overall than Erwin, with the largest gap in hail.
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
Erwin: 30/100 · Johnson City: 33/100
Johnson City is 3 points higher.
Flood
Erwin: 28/100 · Johnson City: 34/100
Johnson City is 6 points higher.
Erwin: FEMA NFHL flood zones: 5 features intersect this tile.
Johnson City: FEMA NFHL flood zones: 6 features intersect this tile.
Wind
Erwin: 14/100 · Johnson City: 14/100
No gap.
Erwin: Wind exposure derived from ingested design wind / climatology tiles.
Johnson City: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Erwin: 33/100 · Johnson City: 30/100
Erwin is 3 points higher.
Erwin: Lightning exposure derived from ingested climatology tiles.
Johnson City: Lightning exposure derived from ingested climatology tiles.
Tornado
Erwin: 0/100 · Johnson City: 8/100
Johnson City is 8 points higher.
Erwin: Tornado risk derived from NOAA SPC historical reports.
Johnson City: Tornado risk derived from NOAA SPC historical reports.
Hail
Erwin: 32/100 · Johnson City: 58/100
Johnson City is 26 points higher.
Erwin: Hail risk derived from NOAA SPC historical reports.
Johnson City: Hail risk derived from NOAA SPC historical reports.
Storm surge
Erwin: Unavailable · Johnson City: Unavailable
A score difference cannot be calculated without both sources.
Erwin: Storm surge model is not available for this location yet.
Johnson City: Storm surge model is not available for this location yet.
Wildfire
Erwin: 40/100 · Johnson City: 50/100
Johnson City is 10 points higher.
Erwin: Wildfire exposure derived from ingested fire potential tiles.
Johnson City: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Erwin: 34/100 · Johnson City: 35/100
Johnson City is 1 points higher.
Erwin: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.
Johnson 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.