Heat Index

Aka: Heat Index

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II. Indications

  1. Assess risk of Heat Illness under Ambient conditions
    1. Accounts for humidity and Temperature

III. 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

IV. 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)

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