what is a heat index

A heat index is a measure of how hot it actually feels outside, taking into account both the air temperature and the humidity level. It's trending in Indiana right now due to the state's recent heatwave, which has brought sweltering temperatures and high humidity levels to many areas. This has made the heat index particularly relevant for residents and outdoor workers. In general, a heat index of 91°F or above is considered extreme and can lead to heat-related illnesses if precautions are not taken.