City vs city
Columbia vs National Harbor, MD
National Harbor currently scores 10 points higher overall than Columbia, 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 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
Columbia: 33/100 · National Harbor: 43/100
National Harbor is 10 points higher.
Flood
Columbia: 22/100 · National Harbor: 16/100
Columbia is 6 points higher.
Columbia: FEMA NFHL flood zones: 4 features intersect this tile.
National Harbor: FEMA NFHL flood zones: 5 features intersect this tile.
Wind
Columbia: 21/100 · National Harbor: 21/100
No gap.
Columbia: Wind exposure derived from ingested design wind / climatology tiles.
National Harbor: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Columbia: 38/100 · National Harbor: 40/100
National Harbor is 2 points higher.
Columbia: Lightning exposure derived from ingested climatology tiles.
National Harbor: Lightning exposure derived from ingested climatology tiles.
Tornado
Columbia: 15/100 · National Harbor: 31/100
National Harbor is 16 points higher.
Columbia: Tornado risk derived from NOAA SPC historical reports.
National Harbor: Tornado risk derived from NOAA SPC historical reports.
Hail
Columbia: 58/100 · National Harbor: 55/100
Columbia is 3 points higher.
Columbia: Hail risk derived from NOAA SPC historical reports.
National Harbor: Hail risk derived from NOAA SPC historical reports.
Storm surge
Columbia: Unavailable · National Harbor: 87/100
A score difference cannot be calculated without both sources.
Columbia: Storm surge model is not available for this location yet.
National Harbor: Storm surge exposure derived from NOAA SLOSH MOM (AGL) data.
Wildfire
Columbia: 38/100 · National Harbor: 49/100
National Harbor is 11 points higher.
Columbia: Wildfire exposure derived from ingested fire potential tiles.
National Harbor: Wildfire exposure derived from ingested fire potential tiles.
Current air quality
Columbia: 42/100 · National Harbor: 42/100
No gap.
Columbia: Air quality signal derived from the latest EPA AirNow combined AQI grid.
National Harbor: Air quality signal derived from the latest EPA AirNow combined AQI grid.