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• Electric power outage; <br /> • Surface and air transportation disruption; <br /> • Telecommunications system outage; <br /> • Human health and safety; <br /> • Psychological hardship; and <br /> • Economic disruption. <br /> Indian River County's vulnerability to tornadoes is compounded <br /> by the high concentration of mobile home residents in large <br /> mobile home communities. According to the 2000 U.S. <br /> Census, there are 6,786 mobile homes in Indian River County, <br /> representing 11.7% of the total housing units in the County. <br /> Three municipalities within Indian River County have significant <br /> concentrations of mobile homes. Sebastian has a total of <br /> 564 mobile homes, representing 7.6% of the total housing <br /> units. Wabasso has a total of 166 mobile homes, representing <br /> 31.9% of the total housing units. Fellsmere has a total of 397 <br /> mobile homes, representing 42.4% of the total housing units. <br /> Risk Assessment. Historical data indicate the overall <br /> vulnerability of Indian River County to tornadoes is low, but <br /> some specific communities have a moderate to high <br /> vulnerability to this hazard due to the type of construction or <br /> numbers of mobile homes (manufactured housing units)within <br /> their boundaries. These communities include Sebastian, <br /> Wabasso, and Fellsmere. <br /> Tornado risk is defined as the annual probability of significant <br /> structural damage and is divided into four probabilities of <br /> occurrence: <1 in 500, 1 in 500, 1 in 200, and 1 in 100. <br /> d. Severe Thunderstorm/Lightning — Hazard Identification <br /> A severe thunderstorm is defined as a thunderstorm containing <br /> one or more of the following phenomena: hail of at least 1 inch, <br /> surface wind speeds of 58 miles per hour or greater, or any <br /> combination of those two criteria (NOAA, NWS, 2014). Severe <br /> weather can include lightning, tornadoes, damaging straight- <br /> line winds, and large hail. Most individual thunderstorms only <br /> last several minutes; however, some can last several hours. <br /> Long-lived thunderstorms are called super cell thunderstorms. <br /> A super cell is a thunderstorm that has a persistent rotating <br /> updraft. This rotation maintains the energy release of the <br /> thunderstorm over a much longer time than typical, pulse-type <br /> Indian River County Comprehensive Emergency Management Plan Basic Page 27 <br />