Jump start your ability to understand heat index which conveys the dangers of excessive heat on human body. The heat index takes into account not only science of meteorology, but biology also. The human body sweats to regulate its internal temperature and helps it cool down. When its humid outside sweat evaporation process is not as effective and the body cannot cool down effectively. Depending upon how humid it is, the difference between actual air temperature and heat index can be significant. Leverage the Modjoul Heat Index model to understand the heat index risks in your given location.