Wind Damage vs. Storm Surge Damage: Case Studies from Hurricane Helene

Abstract

Between 1980 and 2024, natural hazards have resulted in approximately $2.9 trillion in economic losses across the United States. Tropical cyclones represent the most damaging hazard type, accounting for approximately 53% of total losses, and are classified as multi-hazard events due to the combined impacts of wind loading and storm surge inundation. In the contiguous United States, coastal regions comprise only 10% of the total land area yet contain approximately 40% of the population, making these communities particularly susceptible to damage from hurricane-induced wind as well as storm surge-related forces. Following major events, post-disaster damage assessments conducted by federal agencies (such as FEMA) and by private-sector entities (including insurance carriers) are tasked with distinguishing between wind-related and storm surge-related damage. This forensic differentiation is critical for structural failure analysis, accurate insurance claims adjudication, and equitable allocation of recovery resources. Misattribution can lead to substantial disputes and financial discrepancies. This paper presents a case study for both pre-event vulnerability assessments and post-event forensic evaluations aimed at identifying and differentiating wind-induced versus storm surge-induced damage to residential buildings. The methodology described in this document integrates civil engineering principles and forensic investigation techniques to provide guidance for improving damage attribution accuracy and post-disaster decision-making.