Local mitigation strategy (LMS) - Volusia County Government

SECTION 6: VULNERABILITY ASSESSMENT6.8 THUNDERSTORMThunderstorms frequently occur in Volusia County. Since it cannot be predicted where thunderstormsmay occur, all existing and future buildings, facilities and populations are considered to be exposed tothis hazard and could potentially be impacted. It is important to note that only reported thunderstormoccurrences have been factored into this vulnerability assessment 6 .To estimate losses due to extreme wind, NCDC historical thunderstorm wind loss data for occurrences inthe county were used to develop an extreme wind stochastic model. In this model: Losses were obtained and scaled for inflation; Average historic extreme wind damageability was used to generate losses for historicalthunderstorm wind events where losses were not reported; Expected annualized losses were calculated through a non-linear regression of historical data;and Probabilistic losses were scaled to account for would-be losses where no exposure/instrumentwas present at the time of the event.Table 6.8 shows total exposure and potential annualized property losses and percent loss ratios resultingfrom thunderstorms for Volusia County. Although, the annualized losses from thunderstorms in VolusiaCounty are low, the probability and frequency are high. Therefore, it is anticipated that thunderstormswill continue to threaten life and pose property damage throughout the county.6 It is possible that additional extreme wind events may have occurred since 1950 that were not reported to NCDC and are notaccounted for in this analysis.Volusia County Multi-jurisdictional Local Mitigation StrategyFebruary 20106:20