The heat index chart shows the different combinations of temperature and % relative humidity to determine the heat index.   Some examples:  temperature of 85 and relative humidity of 50% results in a heat index of 85; temperature of 90 and relative humidity of 55% results in a heat index of 98. If the heat index is between 80- 89 degrees, fatigue is possible with prolonged exposure or physical activity.  A heat index of 90-104 can result in sunstroke, heat cramps and heat exhaustion with prolonged exposure or physical activity.  A heat index of 105-129 degrees means sunstroke, heat cramps and heat exhaustion are likely, and heat stroke is possible with prolonged exposure or physical activity.  A heat index of 130 and above means heatstroke and sunstroke are highly likely with continued exposure.

Heat Index Chart. http://www.tvweather.com

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