Emergency Medicine Book

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Heat Index

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  1. See Also
    1. Heat Illness
  2. Indications
    1. Assess risk of Heat Illness under Ambient conditions
      1. Accounts for humidity and temperature
  3. Measure: Heat Index
    1. Calculation
      1. Air Temperature: 80 F degrees
        1. Humidity 40%: Heat Index 80 F
        2. Humidity 60%: Heat Index 82 F
        3. Humidity 80%: Heat Index 84 F
        4. Humidity 100%: Heat Index 87 F
      2. Air Temperature: 90 F degrees
        1. Humidity 40%: Heat Index 91 F
        2. Humidity 60%: Heat Index 100 F
        3. Humidity 80%: Heat Index 113 F
        4. Humidity 100%: Heat Index 132 F
      3. Air Temperature: 100 F degrees
        1. Humidity 40%: Heat Index 109 F
        2. Humidity 60%: Heat Index 129 F
      4. Air Temperature: 110 F degrees
        1. Humidity 40%: Heat Index 136 F
    2. Interpretation
      1. Heat Index 80-90 F: Use caution
      2. Heat Index 90-105 F: Moderate risk (Heat exaustion)
      3. Heat Index 105-130 F: High risk (Heatstroke risk)
      4. Heat Index >130 F: Hazardous Conditions
  4. Measure: Wet Bulb Globe
    1. Low Risk: <64 F (<18 C)
    2. Moderate Risk: <73 F (<23 C)
    3. High Risk: <82 F (<28 C)
    4. Hazardous: >82 F (>28 C)
  5. Resources
    1. U.S. National Weather Service
      1. http://weather.noaa.gov/weather/hwave.html

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