Because the south has so much humidity there is a way to evaluate the temperature and humidity. It is called heat index. Never know what you are going to learn next. Might explain why I get so tired when it is really hot out. Also explains why there are so many thunder storms and tornados.
Right now the temperature is 81 degrees and the humidity is 74%. This calculates at 85 degrees heat index. Below is some information from wikipedia about the effects of the different levels of the heat index.
80–90 °F -- Caution — fatigue is possible with prolonged exposure and activity. Continuing activitiy could result in heat cramps
90–105 °F Extreme caution — heat cramps, and heat exhaustion are possible. Continuing activity could result in heat stroke
105–130 °F Danger — heat cramps, and heat exhaustion are likely; heat stroke is probable with continued activity
over 130 °F Extreme danger — heat stroke is imminent
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