City vs city
Norristown vs Upper Merion Township, PA
Norristown and Upper Merion Township are tied on overall score, with the biggest factor difference 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
Norristown: 36/100 · Upper Merion Township: 36/100
No gap.
Flood
Norristown: 70/100 · Upper Merion Township: 68/100
Norristown is 2 points higher.
Norristown: FEMA NFHL flood zones: 6 features intersect this tile.
Upper Merion Township: FEMA NFHL flood zones: 10 features intersect this tile.
Wind
Norristown: 22/100 · Upper Merion Township: 22/100
No gap.
Norristown: Wind exposure derived from ingested design wind / climatology tiles.
Upper Merion Township: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Norristown: 37/100 · Upper Merion Township: 39/100
Upper Merion Township is 2 points higher.
Norristown: Lightning exposure derived from ingested climatology tiles.
Upper Merion Township: Lightning exposure derived from ingested climatology tiles.
Tornado
Norristown: 12/100 · Upper Merion Township: 15/100
Upper Merion Township is 3 points higher.
Norristown: Tornado risk derived from NOAA SPC historical reports.
Upper Merion Township: Tornado risk derived from NOAA SPC historical reports.
Hail
Norristown: 30/100 · Upper Merion Township: 27/100
Norristown is 3 points higher.
Norristown: Hail risk derived from NOAA SPC historical reports.
Upper Merion Township: Hail risk derived from NOAA SPC historical reports.
Storm surge
Norristown: Unavailable · Upper Merion Township: Unavailable
A score difference cannot be calculated without both sources.
Norristown: Storm surge model is not available for this location yet.
Upper Merion Township: Storm surge model is not available for this location yet.
Wildfire
Norristown: 44/100 · Upper Merion Township: 44/100
No gap.
Norristown: Wildfire exposure derived from ingested fire potential tiles.
Upper Merion Township: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Norristown: 38/100 · Upper Merion Township: 40/100
Upper Merion Township is 2 points higher.
Norristown: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.
Upper Merion Township: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.