Res 2018-025/adopting the 2018 Hays County, Texas Hazard Mitigation Plan as the official plan of the City; authorizing the inclusion of the City of San Marcos Hazard Mitigation Plan as an appendix; designating the City Manager as the official authorized

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Hays County Hazard Mitigation Plan, Hays County Annex Hailstorms Hailstorms: Location The entire extent of Hays County is exposed to some degree of hail hazard. Since hail can occur at any location, hail events could be experienced anywhere within the planning area. Hailstorms: Previous Occurrences According to the NOAA Storm Events Database, there were 57 hail events reported for Hays County and its unincorporated jurisdictions since the year 1967. Risk Assessment Hailstorms: Extent and Probability The Tornado and Storm Research Organization (TORRO) created a hail extent index to measure hail called the Hailstorm Intensity Scale. According to the reported previous hail occurrences for the planning area, the maximum hail extent experienced was up to 3 inches, or 76.20 millimeters, in diameter. This size corresponds to a TORRO Hailstorm Intensity Scale classification of a “Super Hailstorm.” Refer to Chapter 2, the risk assessment portion of the main plan document, for the TORRO hail extent scale descriptions. Based on 57 reported events in 49 years, a hail event occurs in Hays County approximately once a year, on average. Since hail events can happen anywhere throughout the HMP planning area, Hays County unincorporated areas’ future probability is assumed to be similar to the entire County area. The planning area’s probability for a hail event is approximately once every year (on average) in the future, with hail up to 3 inches, or 76.20 millimeters, in diameter, corresponding to a TORRO Hailstorm Intensity Scale classi- fication of a “Super Hailstorm.” Hailstorms: Impact Based on the maximum hail extent experienced (76.20 mm), the TORRO Hailstorm Intensity Scale (found in Chapter 2, the risk assessment portion of the main plan document) indicates that impact can be expected to include any of the following: • Varying degrees of damage to vegetation and crops • Damage to plastic structures • Varying degrees of damage to glass • Paint and wood scored • Vehicle bodywork damage • Varying degrees of roof damage • Varying degrees of risk of injuries • Varying degrees of aircraft damage • Brick walls pitted • Risk of severe or even fatal injuries to persons caught in the open Hailstorms: Vulnerability Summary Hays County structures roofs and windows are susceptible to hail damage, to include the County Government Center, County Health Building, Commissioners Court Building, Emergency Services Building, Juvenile Detention Center, and the Sheriff’s Office as they are not retrofitted or hardened for resistance to hail damage. Current plans for the new public safety building will include covered parking for police vehicles. Future plans could incorporate retrofitting and reinforcing existing roofs and windows. 7