According to FEMA, the National Risk Index “…analyzes 18 natural hazard types, in addition to a community’s social vulnerability, community resilience, to provide a more holistic view of risk. It is a great alternative for communities that do not have access to mapping services, since it uses authoritative data from a variety of contributors.” The NRI is derived from component indices for Community Resilience, Social Vulnerability, and economic Expected Annual Losses. Source: National Risk Index for Natural Hazards | FEMA.gov.