windchill index

windchill index

a chart that compares temperatures of the atmosphere with various wind speeds, enabling one to calculate the windchill factor. The comparison is expressed in kilocalories per hour per square meter of skin surface.

wind·chill in·dex

(wind'chil in'deks)
Measure of the environment's potential to cause cold injury, based on ambient air temperature and wind velocity.
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The windchill index was used successfully for decades until it was "improved" by expressing the cooling power of the weather as an equivalent temperature (i.
A windchill advisory is issued when the windchill index is expected to reach -15 to -24 degrees for at least three hours.