The heat index is a formula developed by the U.S. National Weather Service based on Robert G. Steadman’s 1979 paper “ The Assessment of Sultriness.” Prior to that, it didn’t exist.

The heat index is a measure of how hot it really feels on your body when relative humidity is factored in with the actual air temperature.

The heat index, also known as the "apparent temperature," depicts how it actually feels outside by factoring in the moisture or water vapor that’s currently present in the air.

22News Storm Team Meteorologist Chris Bouzakis has a look at what the heat index is and how it can cause heat-related illnesses.

A risk expert explains how to read the heat index and interpret extreme heat warnings, and how to stay safe.

The dangers of heat index Meteorologists figured out a formula to determine how hot a temperature feels to our bodies while considering the humidity. This apparent temperature is called the heat ...

22News Storm Team Meteorologist Chris Bouzakis has a look at what the heat index is and how it can cause heat-related illnesses.