How is Heat Index / Wind Chill calculated?

I really appreciate the time you and many others take to provide the answers for the Top 50 Things ~ Did You Know. On the same line of thought would like to know if WeatherFlow is using the same formula as other weather related agencies do.

I ask because there have been several instances where the X station noted windchill / heat index / feels like etc. Yet the WF system did not show the same in the lower / higher ranges for cold vs hot weather.

ie. Air Port indicates the windchill is -10’C yet the WF station does not indicate a comparative value. In some instances I can understand because the Sky has not detected the same amount of wind speed. Yet other times the same wind speed is seen but the windchill is not represented in the windchill line of the App / Web Portal??

This is often seen at the lower wind speeds from my experience. :thinking: