Do you know how they determine what heat index is for any given day? Many people know that the number represents what it actually feels like outside when the relative humidity is combined with the air temperature . But did you know that the heat index is the temperature in shady locations? And though it may not be as hot as a normal summer day , if the humidity is high , you can still run into health issues? Check out 
   this graph
    that the National Weather Service created that shows when the heat index is too high and what you should do .  
   

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