Portsmouth city Disaster Risk

Portsmouth city has a FEMA National Risk Index rating of Relatively Low, placing it in the 54th 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.

Portsmouth city is evaluated for five major natural hazard types: hurricane (87th percentile), earthquake (65th percentile), flooding (64th percentile), tornado (51th percentile), wildfire (20th percentile). The highest-risk hazard is hurricane at the 87th 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.

Portsmouth city's composite risk percentile is 54th, compared to the Virginia state average of 33th percentile. The state's overall risk rating is Very Low. This means Portsmouth city faces higher natural disaster risk than the typical county in Virginia.

Yes, Portsmouth city's hurricane risk is at the 87th percentile nationally. This places it in the top quartile for this hazard type. For flooding specifically, Portsmouth city is at the 64th 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.

Portsmouth city's composite risk score of 54th percentile is above the Virginia state average of 33th percentile. This elevated risk is driven by hurricane exposure (87th percentile), along with earthquake and flooding and tornado risk. Geographic location, terrain, climate patterns, and proximity to flood zones or fault lines all influence a county's risk profile.