Harrison County Disaster Risk

Harrison County has a FEMA National Risk Index rating of Relatively High, placing it in the 96th percentile nationally out of 3,144 counties. This composite score reflects the county's overall exposure to natural hazards including floods, wildfires, tornadoes, earthquakes, and hurricanes, weighted by expected annual loss and social vulnerability.

Harrison County is evaluated for five major natural hazard types: hurricane (99th percentile), tornado (96th percentile), wildfire (95th percentile), flooding (92th percentile), earthquake (70th percentile). The highest-risk hazard is hurricane at the 99th percentile nationally. These scores are derived from FEMA's National Risk Index, which analyzes expected annual loss, social vulnerability, and community resilience for each hazard type.

Harrison County's composite risk percentile is 96th, compared to the Mississippi state average of 51th percentile. The state's overall risk rating is Relatively Low. This means Harrison County faces higher natural disaster risk than the typical county in Mississippi.

Yes, Harrison County's hurricane risk is at the 99th percentile nationally. This places it in the top quartile for this hazard type. For flooding specifically, Harrison County is at the 92th percentile.

FEMA's National Risk Index (NRI) calculates risk scores for 18 natural hazard types across all U.S. counties and census tracts. The composite score combines Expected Annual Loss (estimated dollar losses from each hazard), Social Vulnerability (demographic factors affecting disaster impact), and Community Resilience (ability to recover). Percentile scores rank each county against all 3,144 U.S. counties, and risk ratings range from Very Low to Very High.

Harrison County's composite risk score of 96th percentile is above the Mississippi state average of 51th percentile. This elevated risk is driven by hurricane exposure (99th percentile), along with tornado and wildfire and flooding and earthquake risk. Geographic location, terrain, climate patterns, and proximity to flood zones or fault lines all influence a county's risk profile.