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Table A-3 Natural Hazards Potential Impact Data for Cabarrus County Natural Hazard Ran.~e Cabar'rus County Earthquake Vulnerability Low =1 to High = 6 3 Landslide Vulnerability Low =1 to High = 6 3 Frequency of All Hurricanes, 1900-1996 Saffir-Simpson Class 1-5 0 Frequency of Minor Hurricanes, 1900-1996 Saffir-Simpson Class 1-2 0 Frequency of Major Hurricanes, 1900-1996 Saffir-Simpson Class 3-5 0 Nor'easter Vulnerability 1 = some direct 0 vulnerability Frequency of Tornado es, 1953-1995 Number of tornadoes 7 Extreme 1-day snowfall In inches 9 Wildfires, 1950-1993 Low = 1, Mod. =2, High = 3 1 Number of Acres Burned, 1950-1993 Low = 1, Mod, =2, High = 3 1 Source: Local Hazard Mitigation ?lanning Manual, NCDEM, 1998, p. 86. O. Hazard Index for Cabarrus County. Certain parts of the County, such as floodplains and steep river or creek banks, are more prone to hazards. In addition, certain types of hazards are likely to produce only localized effects while others have wide spread effects. Some natural hazards have extraordinary impacts but occur infrequently. Other hazards occur annually or several times a decade, but cause less damage. The total potential impact of each type of hazard can be projected using a combination of likely strength of the event, the size of the area(s) affected, and the density of human activity within the likely path of the hazard. Table A-4 gives each natural hazard a "hazard index" rating based on a combination of three factors - likelihood of occurrence, size of potential area affected, and the potential impact of the event. Table A-4 Hazard Index for Cabarrus Hazard Type Likelihood of Potential Area Potential Hazard Index Occurrence Affected Impacts (combined Hurricane Likely Large Limited 4 Flood Likely Small Limited 5 Tornado Possible Small Limited 3 Nor'easter Unlikely - - Thunderstorm Highly Likely Medium Negligible 1 Severe Winter Storm Likely Large Limited 2 Wildfire Likely Small Negligible 6 Earthquake Unlikely Large Negligible 8 Landslide Unlikely Small Negligible 7 ;ource: Keeping Natural Hazards from Becoming Natural Disasters, NCDEM, 1998, pp. 10-12. P. History of Storm Events in Cabarrus County. 1. Thunderstorms, with accompanying high winds and lightening, are the most common of the natural hazards encountered in Cabarrus County. Since 1950, there are records for 87 Draft Annex A v.3.1 A-6 1 July 2002