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3 <br />Winds : 111 -130 mph (96 -113 kt) <br />Some structural damage to small residences and utility buildings, with a minor amount of <br />curtainwall failures. Mobile homes are destroyed. Flooding near the coast destroys smaller <br />structures with larger structures damaged by floating debris. Terrain may be flooded well inland. <br />4 <br />Winds: 13 1-15 5 mph (114 -135 kt) <br />More extensive curtainwall failures with some complete roof structure failure on small residences. <br />Major erosion of beach areas. Terrain may be flooded well inland. <br />5 <br />Winds: 155+ mph (135+ kt) <br />Complete roof failure on many residences and industrial buildings. Some complete building <br />failures with small utility buildings blown over or away. Flooding causes major damage to lower <br />floors of all structures near the shoreline. Massive evacuation of residential areas may be required. <br />(b) These storms have long threatened the North Carolina coastal plain, but Cabarrus <br />County has occasionally felt the effects of hurricanes that have retained their force <br />after landfall. Generally, these storms are not those that cross the North Carolina <br />coast, but those that make landfall farther to the south. It is not unusual to receive the <br />effects of hurricanes from as far south as the Gulf coast. Typically these storms bring <br />heavy rains and some high winds. This can cause flooding in some areas of the <br />county. Cabarrus County has experienced development in high -risk areas such as <br />river and stream floodplains that are vulnerable to flooding caused by inland <br />hurricane effects. Cabarrus County also has a number of manufactured homes that are <br />vulnerable to flooding. <br />(c) According to historical data, North Carolina has experienced landfall hurricanes <br />more frequently in recent years, each having a measurable impact on some area of the <br />State. A major landfall hurricane can have a tremendous adverse impact on Cabarrus <br />County in terms of property damage, loss of life, and economic impacts from <br />business closures. Hurricane Hugo in 1989 had a serious impact on the county, and is <br />an example of the damage possible from inland hurricane effects. <br />(d) Similar to hurricanes, Nor'easters are ocean storms capable of causing damage to <br />coastal areas due to strong. winds and heavy surf. Nor'easters are known for dumping <br />heavy amounts of rain and snow, producing hurricane force winds and causing beach <br />erosion and coastal flowing. Due to the inland nature of Cabarrus County Nor'easters <br />are viewed primarily as winter storm type events as the coastal storm characteristics <br />would not likely be observed in the county. <br />2. Floods (Map A -1 Cabarrus County Multi - Hazards) <br />(a). Flooding is normally the result of a larger event such as a hurricane, thunderstorm <br />or prolonged rainfall. Flooding is caused by excessive precipitation and can be <br />generally considered in two categories: flash floods and general floods. Flash floods <br />are the product of localized, high- intensity precipitation over a short time period in <br />small drainage basins. General floods are caused by precipitation over a longer time <br />period and over a given river basin. A combination of river basin physiography, local <br />thunderstorm movements, past soil moisture conditions, and the degree of vegetative <br />clearing determine the severity of a flooding event. Flooding is typically most severe <br />in areas of the floodplain immediately adjacent to major streams and rivers. <br />Annex A Hazard Identification and Analysis A -2 1 December 20 Achment number s <br />F -6 Page 106 <br />