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1%r During the tornado in December of 2002 , the ARC provided services to three families hit by the tornado and opened a shelter for 38 families who were ordered to evacuate because their homes were deemed unsafe . Because tornadoes 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 . 3. 2 Vulnerability Assessment Tornado events can have the following potential impacts within acommunity : Excessive wind ; Electric power outage ; • Surface and air transportation disruption ; Telecommunications system outage ; Human health and safety ; • Psychological hardship ; and Economic disruption . Indian River County's vulnerability to tornadoes is compounded by the high concentration of mobile home residents in large mobile home communities . 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 County have significant concentrations of mobile homes . Sebastian has a total of 564 mobile 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 . 3. 3 Risk Assessment Historical data indicate the overall vulnerability of Indian River County to tornadoes is low , but some specific communities have a moderate to high vulnerability to this hazard due to the type of construction or numbers of mobile homes ( manufactured housing units ) within their boundaries . These communities include Sebastian , Waba so , and Fellsmere . The risk assessment data for tornadoes in Indian River County are based on data developed for the MEMPHIS , which was developed by the FDCA . Tornado risk is defined as the annual probability of significant stru tura ) damage and is divided into four probabilities of occurrence : < 1 in 500 , 1 in 500 , 1 in 2 0 , and 1 in 100 . Table 4 . 19 illustrates the tornado exposure in Indian River County . Table 4 . 19 . Tornado exposure , Indian River County , 2003 . Probability of Number of Value of Structures Population at Risk Occurrence Structures 1in 500 53 , 268 $6 , 903 , 527 , 424 112 , 947 Source : Florida Department of Community Affairs , 2004a . 4-31