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no data available to document previous occurrences of <br />extreme heat by jurisdiction. <br />Extent. The average annual high temperature for Indian River <br />County is 81.4 degrees. The highest observed temperature <br />recorded in Vero Beach was 100 degrees in June of 1950. The <br />heat index, also known as the apparent temperature, is what <br />the temperature feels like to the human body when relative <br />humidity is combined with the air temperature. NOAA's <br />National Weather Service Heat Index uses temperature and <br />relative humidity to determine the apparent temperature. For <br />example, if the air temperature is 100°F and the relative <br />humidity is 55%, the heat index will be 124°F. The highest <br />temperature in Indian River County would never be expected <br />to exceed 124°F. Extreme heat is considered to have a low <br />probability of occurrence, therefore this hazard will not be fully <br />profiled. <br />Vulnerability Assessment. Extreme temperature events can <br />have the following potential impacts within a community: <br />• Electric power outage; <br />• Human health and safety; <br />• Psychological hardship; <br />• Economic disruption; <br />• Agricultural/fisheries damage; and <br />• Damage to critical environmental resources; <br />Temperature extremes, both freezes and periods of <br />excessive heat, impact communities with a larger population <br />of older people to a greater extent than those with younger <br />populations. According to the 2010 U.S. Census, 41,178 <br />residents (29%) in Indian River County are over the age of <br />65 (http://quickfacts.census.gov/qfd/states/12/12061.html). <br />Freezing conditions primarily affect agriculture and homeless <br />indigents. When conditions are predicted to be below <br />freezing, shelters are opened. According to Florida's <br />Council on Homelessness, a point -in -time county for the <br />period of 2015-2019 indicated that Indian River County had <br />an average of 486 homeless individuals within the County <br />(https:Hmvflfamilies.com/service- <br />programs/homelessness/docs/2019Council Report. pd <br />Inland communities away from the moderating influence of <br />the ocean or the estuary are more vulnerable to temperature <br />Indian River County Comprehensive Emergency Management Plan Basic Page 44 <br />