![]() This should result in more accurate calculations of human body heat loss." The "new" wind chill formula was developed in 2001 and according to the National Weather Service, the formula is more detailed, "accounting for wind effects at face-level. ![]() This lead to meteorologists forecasting wind chill readings much lower than actuality. In addition, weather stations measure wind speed, the basis for the WCT index, at a height of 33 feet where it is often blowing stronger. This old system did not take in consideration that the human body produces its own heat, unlike the plastic containers. The Siple and Passell formula was implemented through a series of observations on freeze times of plastic cylinders filled with water and placed in differing temperatures and wind speeds. The "old" wind chill formula was first instilled in the 1940s and based on the research from Antarctic explorers Siple and Passel. As wind increases the internal body temperature is driven down at a faster fast, quickly reducing the exterior and interior body temperatures. Wind Chill describes the rate of heat loss on the human body resulting from the combined effect of low temperature and wind. Weather channels and news organizations are still making reference to the "old" wind chill formulas.
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