Heat index

An apparent temperature calculation designed to determine the temperature that the human body “feels” when its evaporative cooling mechanism (perspiration) is limited due to increased relative humidity. The variables required to calculate the heat index (HI) were established originally by Steadman (1979), but the current operational equation was created through multiple regression statistical analyses by Rothfusz (1990):

 is air temperature (°C),
R is the relative humidity (%).
In the United States, the National Weather Service uses the HI primarily to determine when to issue heat alerts.

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