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generated by the hurricane. The number of eligible tree debris <br /> truckloads will depend on how the 5,037 tons of eligible tree <br /> debris are collected and processed. The volume of tree debris <br /> generally ranges from about 4 cubic yards per ton for chipped <br /> or compacted tree debris to about 10 cubic yards per ton for <br /> bulkier, uncompacted debris. <br /> Risk Assessment. All communities within Indian River County <br /> are highly vulnerable to hurricanes, but they are not all <br /> vulnerable for the same reasons. The barrier island <br /> communities (Town of Orchid, Indian River Shores, and the <br /> beach side of the City of Vero Beach) are obviously highly <br /> vulnerable to both wind and storm surge damage from <br /> hurricanes. The communities fronting on Indian River County's <br /> estuaries and rivers are also highly vulnerable to flooding <br /> associated with hurricane winds and storm surge. Inland <br /> communities may have less hurricane vulnerability from <br /> flooding but more hurricane vulnerability from wind damage <br /> due to their older or less substantial type of construction. <br /> C. Tornado — Hazard Identification <br /> A tornado is a violent windstorm characterized by a twisting, <br /> funnel-shaped cloud extending to the ground. It is generated <br /> by a thunderstorm or hurricane when cool air overrides a layer <br /> of warm air, forcing the warm air to rise rapidly. The most <br /> common type of tornado, the relatively weak and short-lived <br /> type, occurs in the warm season, with June being the peak <br /> month. The strongest, most deadly tornadoes occur in the <br /> cool season, from December through April (FDCA, 2004b). <br /> Occasional windstorms accompanied by tornadoes, such as <br /> the winter storm of 1993, also are widespread and destructive. <br /> When a tornado threatens, only a short amount of time is <br /> available for life-or-death decisions. The NWS issues two <br /> types of alerts: <br /> • Tornado Watch — means that conditions are favorable for <br /> tornadoes to develop. <br /> • Tornado Warning — means that a tornado has actually <br /> been sighted. <br /> Tornadoes are classified using the Enhanced Fujita-Pearson <br /> scale. On February 1, 2007, the Enhanced Fujita Scale <br /> replaced the original Fujita scale in all tornado damage surveys <br /> Indian River County Comprehensive Emergency Management Plan Basic Page 25 <br />