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

Home Browse Search

Extreme Heat Extreme Heat: Description According to the 2013 State of Texas Hazard Mitigation Plan Update, extreme heat is defined as a combination of very high temperatures and, usually, exceptionally humid conditions. When persisting over a period of time, it is called a heat wave. Extreme Heat: Extent Scale Figure 2.1 illustrates NOAA’s National Weather Service (NWS) Heat Index commonly used to provide information on perceived heat and dangers of exposure considering the relationship between air temperature and relative humidity. The heat index value can be increased by up to 15°F if exposed to Risk Assessment direct sunlight as the index was created for shady locations. (NOAA/NWS, 2017) 33