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Because thunderstorms are hazards that are not bounded by geographic or topographic characteristics , there are no definite means to determine whether or not the extent of this hazard differs from jurisdiction to jurisdiction within Indian River County . 4. 1 . 4. 2 Vulnerability Assessment Thunderstorm events can have the following potential impacts within a community : • Excessive wind ; Excessive water; • Damaging hail ; • Electric power outage ; • Surface and air transportation disruption ; • Telecommunications system outage ; • Human health and safety ; • Psychological hardship ; • Economic disruption ; • Fire ; and • Stormwater drainage impairment. Thunderstorms typically cause damage in a community by knocking down trees and power lines . Downed trees can block key roadways within a community , making emergency response more difficult . Downed power lines block roadways , disrupt businesses when power is lost , and pose threats to people when lines are severed . Mobile homes also `%W are more susceptible during severe thunderstorm activity. According to the 2000 U . S . Census , there are 6 , 786 mobile homes in Indian River County , representing 11 . 7% of the total housing units in the County . Three municipalities within Indian River COL my have significant concentrations of mobile homes . Sebastian has a total of 564 mob le homes , representing 7 . 6 % of the total housing units . Wabasso has a total of 166 mobile homes , representing 31 . 9% of the total housing units . Fellsmere has a total of 397 mobile homes , representing 42 . 4% of the total housing units . 4. 1 . 4. 3 Risk Assessment Vulnerability to severe thunderstorms and lightning is high in Indian River County , but many of the jurisdictions and population centers have only moderate vulnerabilities relative to these hazards . This variation in relative levels of vulnerability is again primarily due to construction practices and community characteristics . Working Communities have a higher vulnerability to economic impacts by lightning than residential or retirenlent communities , all other factors being equal , while residential and retirement communities have a historically higher vulnerability in terms of lightning fatalities . At the time of publication , a risk assessment model for severe thunderstorms was not available . The County can expect losses similar to what it experienced in he past , which is about an average of $ 17 , 500 per year in property damage . 4-33