windchill factor

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windchill factor

Etymology: AS, wind, air, cele, cold
the amount of chilling of the body, beyond that resulting from a cold ambient temperature, because of exposure to cool air currents. The windchill factor is expressed in degrees Celsius or Fahrenheit as the effective temperature felt by a person exposed to the weather. Because windchill factors are based on exposure of dry skin to cool air currents, air blowing at the same speed over a wet skin surface would cause additional loss of body heat and a greater windchill.

windchill factor

Loss of heat from exposure of skin to wind. Heat loss is proportional to the speed of the wind. Thus, skin exposed to a wind velocity of 20 mph (32 km/hr) when the temperature is 0°F (−17.8°C) is cooled at the same rate as in still air at −46°F (−43.3°C). Similarly, when the temperature is 20°F (−6.7°C) and the wind is 10, 20, or 35 mph (16.1, 32.2, or 56.3 km/hr), the equivalent skin temperature is −4°, −18°, or −28°F (−20°, −27.8°, or −33.3°C), respectively.

The windchill factor is calculated for dry skin; skin that is wet from any cause and exposed to wind loses heat at a much higher rate. Wind blowing over wet skin can cause frostbite, even on a comfortably warm day as judged by the thermometer.

See also: factor
References in periodicals archive ?
For the past two generations, weatherheads have been warning winter watchers about the wind chill factor, which combines temperature with wind speeds to express how quickly a human body will lose its warmth.
If there's a wind chill factor, or if your clothes are wet, body temperature falls faster.
THE ICEBOT -- With the wind chill factor below -50[degrees], WHOI engineer Amy Kukulya and engineering technician Kris Newhall launch the robotic underwater vehicle REMUS into a hole cut into a stretch of sea ice extending into the Chukchi Sea from Barrow, Alaska, the northernmost city in the United States.
On o positive note, this year's UK crop is excellent, the result of o good chill factor, milder and wormer weather during spring with no frosts and good flower pollination.
Pouring rain, the five degree centigrade temperature - the wind chill factor made it feel much colder for the competitors - and debris washed on to the road by the deluge persuaded Cooke to seek an early shower.
Those who struggle with bushels and pecks will find relief here, as will those who cannot for the life of them remember standard drill sizes or the formula for wind chill factor.
The Chill Factor event at Tiger Tiger in Newcastle on Saturday will lead to one adventurer getting the chance to go on an all-expenses-paid journey to the South Pole.
Rainer, a winter storm created a chill factor of -30 degrees below zero.
It is suitable for casting aluminum and bronze, where its low expansion and high chill factor improves surface finish and breakdown while reducing cycle times and dendrite arm spacing.
The heating system had to maintain 13[degrees]c from -7[degrees]C outside temperature plus a severe wind chill factor.
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She has two ponies through, having finished third and fourth in the Area 7 regional final on Amadeus and Chill Factor.