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2021 Multijurisdictional Local Hazard Mitigation Plan Definitions/Acronyms xvii terrorism—The unlawful use or threatened use of force or violence against people or property with the intention of intimidating or coercing societies or governments. Terrorism is either foreign or domestic, depending on the origin, base, and objectives of the terrorist or organization. thunderstorm—A storm with lightning and thunder produced by cumulonimbus clouds. Thunderstorms usually produce gusty winds, heavy rains, and sometimes hail. Thunderstorms are usually short in duration (seldom more than 2 hours). TOD—Transit-Oriented Development tornado—A violently rotating column of air extending between and in contact with a cloud and the surface of the earth. Tornadoes are often (but not always) visible as funnel clouds. transportation incident—A major incident related to a means of transportation such air, rail or highway travel resulting in death, serious injury, or extensive property loss or damage. UN—United Nations USDA—U.S. Department of Agriculture USDM—U.S. Drought Monitor USGS— U.S. Geological Survey vulnerability—Assessment of how exposed or susceptible an asset is to damage. Vulnerability depends on an asset’s construction, contents, and the economic value of its functions. watershed—An area that drains downgradient from areas of higher land to areas of lower land to the lowest point. windstorm—Generally short-duration events involving straight-line winds or gusts exceeding 50 mph. These gusts can produce winds of sufficient strength to cause property damage. WUI—Wildland Urban Interface Zone C, Zone X—Areas determined to be outside the 1 percent and 0.2 percent annual chance floodplains. zoning ordinance—Ordinance that designates allowable land use and intensities for a local jurisdiction.