Winter is arriving and that brings to mind something I used to wonder about , the windchill index that weather people always cite , but hardly ever explain . Specifically, the new WCT index:
Calculates wind speed at an average height of five feet (typical height of an adult human face) based on readings from the national standard height of 33 feet (typical height of an anemometer)
Is based on a human face model
Incorporates modern heat transfer theory (heat loss from the body to its surroundings, during cold and breezy/windy days)
Lowers the calm wind threshold to 3 mph
Uses a consistent standard for skin tissue resistance
Assumes no impact from the sun (i.e., clear night sky).
Perhaps this chart will help .
The chart is better viewed on The National Weather Service site .
They also offer a calculator for you .
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