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2025 Hazard Mitigation Plan <br />Kittitas Gounty, Washington <br />Figure 4-17. NWS Heat lndex Chart <br />itrl National Weather Service <br />Heat lndex Ghart <br />Temperature ('F) <br />s <br />ttc <br />I <br />o <br />o <br />o <br />e, <br />Likelihood of Heat Disorders with Prolonqed Exposure and/or Strenuous Activity <br />Caution Extreme Caution I Danger I Extreme Danger <br />80 81 <br />80 82 <br />81 83 <br />81 84 <br />828/ <br />82 85 <br />83 86 <br />84 88 <br />w89 <br />85 90 <br />86 9t <br />B6 99 <br />87 S5 <br />85 <br />87 <br />88 <br />89 <br />gt <br />93 <br />06 <br />97 <br />84 <br />85 <br />86 <br />88 <br />89 <br />90 <br />e2 <br />g4 <br />9B <br />g8 <br />t@ <br />89 <br />9ts <br />ss <br />98 <br />g3 c6 <br />95 99 <br />s7 t0{ <br />r00 <br />tr08 <br />40 <br />45 <br />50 <br />55 <br />60 <br />65 <br />70 <br />75 <br />80 <br />85 <br />90 <br />95 <br />100 <br />Cold Wave/Extreme Cold <br />Cold waves are a rapid temperature drop within 24 hours and/or when extreme low temperatures are <br />expected for an extended period of time. The temperatures classified as a cold wave are dependent on <br />the location and defined by the local NWS Forecast Office.-1e6 The Wind Chill lndex is a measure of how <br />cold it really feels when there is wind and low temperatures. lt considers the human body's heat loss due <br />to its surroundings during cold and windy weather..1e7 <br />The wind chill index helps determine when dangerous conditions develop that could lead to frostbite and <br />hypothermia."les Figure 4-18 illustrates the NWS Wind Chill Chart. <br />1eo Federal Emergency Management Agency. (2023). Cold Wave. Retrieved from <br />https ://hazards.fema.gov/nri/winter-weather. <br />1e7 NationalWeather Service. (n.d.). Wind Chill Chart. Retrieved from https://www.weather.gov/safetv/cold-wind- <br />chill-chart. <br />1e8 lbid. <br />Chapter 4: Hazard ldentification and Risk Assessment 154