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Tri-Valley Local Hazard Mitigation Plan Definitions/Acronyms <br />xviii <br />mass. Fuel can include living and dead vegetation on the <br />ground, along the surface as brush and small trees, and in <br />the air such as tree canopies. Topography includes both <br />slope and elevation. Air mass includes temperature, <br />relative humidity, wind speed and direction, cloud cover, <br />precipitation amount, duration, and the stability of the <br />atmosphere at the time of the fire. Wildfires can be ignited <br />by lightning and, most frequently, by human activity <br />including smoking, campfires, equipment use, and arson. <br />Windstorm—Windstorms are generally short-duration <br />events involving straight-line winds or gusts exceeding 50 <br />mph. These gusts can produce winds of sufficient strength <br />to cause property damage. Windstorms are especially <br />dangerous in areas with significant tree stands, exposed <br />property, poorly constructed buildings, mobile homes <br />(manufactured housing units), major infrastructure, and <br />aboveground utility lines. A windstorm can topple trees <br />and power lines; cause damage to residential, <br />commercial, critical facilities; and leave tons of debris in its <br />wake. <br />Zoning Ordinance—The zoning ordinance designates <br />allowable land use and intensities for a local jurisdiction. <br />Zoning ordinances consist of two components: a zoning <br />text and a zoning map. <br /> <br /> <br />Page 83 of 228