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.
However, this does not indicate that the winter is back as the chill factor will vanish soon when this system moves away.
Huddersfield weather expert Paul Stevens said the air is coming in from Siberia and with a wind chill factor it could be -8degC on the east coast.
Katie and Tom hardly looked at each other during meal and, below, Tom says goodbye to daughter Suri Chill factor.
CHILL FACTOR The Northumberland border covered with a blanket of snow as weather forecasters predict worse weather to come in the next few days
However, the chill factor is starting to creep in with meteorologists saying temperatures would fall overnight and into the weekend, getting as low as -5C.
Various initiatives will include a "Freeze Yourself" digital app and a "Frozen Ticket" partnership with select retailers, as well as the ultimate chill factor in the form of an on-pack promotion with Snow Village Canada, the novelty village made of ice in Montreal.
Meteorological officials said the chill that Delhiites are feeling nowadays is because of the wind- chill factor ( the perceived decrease in air temperature felt by the body due to the flow of air).
NEVER mind X Factor, it''s The chill factor that''s starting to grip Brrr-itain.
Flying at a speed of 250 miles per hour, in a temperature of 150 degrees below zero with the wind chill factor, Nuzum inched his way to the jet's tailgate, unable to ignore the intense knot in his gut - the same knot he felt on his first skydive with his college roommate over Seattle in 1966, and on every one since - and jumped from just over 13,000 feet.
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.
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.