City vs city
Gretna vs Harvey, LA
Gretna currently scores 3 points higher overall than Harvey, 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 is a current EPA AirNow signal; 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
Gretna: 61/100 · Harvey: 58/100
Gretna is 3 points higher.
Flood
Gretna: 29/100 · Harvey: 35/100
Harvey is 6 points higher.
Gretna: FEMA NFHL flood zones: 31 features intersect this tile.
Harvey: FEMA NFHL flood zones: 36 features intersect this tile.
Wind
Gretna: 50/100 · Harvey: 52/100
Harvey is 2 points higher.
Gretna: Wind exposure derived from ingested design wind / climatology tiles.
Harvey: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Gretna: 92/100 · Harvey: 88/100
Gretna is 4 points higher.
Gretna: Lightning exposure derived from ingested climatology tiles.
Harvey: Lightning exposure derived from ingested climatology tiles.
Tornado
Gretna: 54/100 · Harvey: 58/100
Harvey is 4 points higher.
Gretna: Tornado risk derived from NOAA SPC historical reports.
Harvey: Tornado risk derived from NOAA SPC historical reports.
Hail
Gretna: 95/100 · Harvey: 84/100
Gretna is 11 points higher.
Gretna: Hail risk derived from NOAA SPC historical reports.
Harvey: Hail risk derived from NOAA SPC historical reports.
Storm surge
Gretna: 99/100 · Harvey: 99/100
No gap.
Gretna: Storm surge exposure derived from NOAA SLOSH MOM (AGL) data.
Harvey: Storm surge exposure derived from NOAA SLOSH MOM (AGL) data.
Wildfire
Gretna: 38/100 · Harvey: 20/100
Gretna is 18 points higher.
Gretna: Wildfire exposure derived from ingested fire potential tiles.
Harvey: Wildfire exposure derived from ingested fire potential tiles.
Current air quality
Gretna: 31/100 · Harvey: 25/100
Gretna is 6 points higher.
Gretna: Air quality signal derived from the latest EPA AirNow combined AQI grid.
Harvey: Air quality signal derived from the latest EPA AirNow combined AQI grid.