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The NWS Windchill Temperature
(WCT) index uses advances in science, technology, and computer
modeling to provide an accurate, understandable, and useful formula
for calculating the dangers from winter winds and freezing temperatures. The 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 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).
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Note: Windchill Temperature is only defined for temperatures
at or below 50 degrees F and wind speeds above 3 mph. Bright sunshine may
increase the wind chill temperature by 10 to 18 degrees F. |
Last Updated:
December 17, 2009->->
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