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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Extreme heat occurs on a regional scale; the entire planning area is equally at risk as it can occur anywhere within the participating communities. NOAA’s Online Weather Data (NOWData) provides temperature data ranging from the year 2000 to 2016. NOAA’s National Weather Service (NWS) Heat Index shown in Figure 2.1 indicates that temperatures meeting or exceeding 90°F are designated with an “Extreme Caution” or greater warning classification. Extreme heat for the planning area is considered temperatures ranging from 90°F and above. According to Canyon Dam Station, the local weather data collection center with comprehensive data Risk Assessment within the planning area, the mean number of days with a daily max temperature equal or greater to 90°F is 94 days. Currently, the greatest number of days during which the planning area experienced extreme heat is 119 in 2008 while the highest temperature experienced was 109°F in August 2011 (a “Danger” NWS Heat Index classification). Due to the regional nature of extreme heat occurrence, Canyon Dam Station records apply equally to all participating communities. The extent of extreme heat that the planning area has experienced can be derived from the data provided from NOWData at Canyon Dam Station since the year 2000. The highest daily mean temperature experienced was 109°F in August 2011. This event is classified by the NWS Heat Index as “Danger”. The probability of future events can be determined by assessing historical averages. Since extreme heat events occur on a regional scale, all participating communities’ future probability is assumed to be similar to the area surrounding Canyon Dam Station. Based on NOWData, the planning area can expect, on average, approximately 94 days a year with temperatures equal or greater to 90°F, and up to 109°F, a “Danger” warning classification per the NOAA NWS Heat Index. As extreme heat events have occurred every year since 2000, the probability of extreme heat affecting the planning area is 100% in any given year. Extreme heat has physical impacts on the public and the infrastructure that supports them. According to the Texas Health Care Information Collection and Trauma Registry from the Texas Department of State Health Services’ Injury Epidemiology & Surveillance Branch, the following number of patients were received in Hays County medical facilities for Heat Related Injuries and Trauma (shown in Tables 2.5 and 2.6). Description20102011201220132014 Accident caused by excessive heat due to 13500 weather conditions Accident due to excessive heat of 10000 unspecified origin (Texas Department of State Health Services- Injury Epidemiology & Surveillance Branch, 2017) 34