wind chill


wind chill
Still-air temperature that would have the same cooling effect on exposed skin as a given combination of temperature and wind speed.

As the wind speed increases, the wind chill equivalent temperature decreases; e.g., an air temperature of 30 °F (–1.1 °C) with a wind speed of 20 mph (32.2 kph) produces a wind chill of 17 °F (–8 °C). Wind chill is often included in weather reports to describe how cold it feels.

Matching a specific air temperature (columns) with a wind speed (rows) will show the wind chill ...

Encyclopædia Britannica, Inc.

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also spelled  windchill , also called  wind chill factor 
 a measure of the rate of heat loss from skin that is exposed to the air. It is based on the fact that, as wind speeds increase, the heat loss also increases, making the air “feel” colder. Wind chill is usually reported as a “wind chill temperature” or “wind chill equivalent”—that is, the temperature under calm air at which heat loss would be equal to the loss actually being experienced because of higher wind speeds. For example, as is shown in the Celsius wind chill chart—>, a temperature of −25 °C (−13 °F) in calm air would have a wind chill temperature equal to the actual air temperature. Under these conditions, exposed skin would freeze in 30 minutes. At a wind speed of 40 km (25 miles) per hour, however, the wind chill temperature would be −41 °C (−42 °F), and skin would freeze in less than 10 minutes.

      Wind chill indices, the formulas and assumptions used to calculate wind chill temperatures, have varied over the years. For the second half of the 20th century, weather forecasts (weather forecasting) in North America commonly used the Siple-Passel index, based on wind speeds measured by an anemometer 10 metres (33 feet) above the ground. During the winter of 2001–02, the U.S. National Weather Service (see also weather bureau) and the Meteorological Service of Canada introduced a new index based on heat lost from the exposed faces of 12 volunteers in a chilled wind tunnel. Calm air is considered to have winds of 5 km (3 miles) per hour or less. Clear night sky conditions are assumed, eliminating any warming effect of the Sun.

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Universalium. 2010.

Look at other dictionaries:

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  • wind chill — [ˈwınd tʃıl] n [U] technical the cooling effect of the wind ▪ It must have been minus 5 with the wind chill factor …   Dictionary of contemporary English

  • Wind Chill — Wind Chill, est un film américano britannique d épouvante réalisé par Gregory Jacobs, sorti en 2007. Sommaire 1 Synopsis 2 Fiche technique 3 Distribution 4 …   Wikipédia en Français

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  • wind chill — [ wınd ,tʃıl ] noun uncount the fact that the wind makes the air temperature feel colder …   Usage of the words and phrases in modern English

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  • wind·chill — /ˈwındˌʧıl/ noun, pl chills chiefly US 1 [noncount] : the effect that wind has of making air feel colder than it actually is It s cold outside, and it feels even colder because of the windchill. called also windchill factor 2 [count] : a… …   Useful english dictionary


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