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Topic: Wind chill factor

	Wind chill - Wikipedia, the free encyclopedia
		Wind chill is the apparent temperature felt on exposed skin due to the combination of air temperature and wind speed.
		Except at higher temperatures, where wind chill is considered less important, the wind chill temperature (often incorrectly called the "wind chill factor") is always lower than the air temperature, because any wind increases the rate at which moisture evaporates from the skin and carries heat away from the body.
		The exact definition of wind chill has been controversial because it is a composite index, because animate and inanimate bodies behave differently, and because wind chill reports have a major impact on winter tourism.
	en.wikipedia.org /wiki/Wind_chill (839 words)

	Capgo - Wind Chill
		The wind chill factor is a calculated temperature that represents the ‘feel’ of a wind on exposed human skin in terms of an equivalent temperature in still air.
		The wind chill is commonly presented as a table of temperature versus wind speed.
		The Wind Chill Factor is a useful measure, as it may be used in conjunction with other mechanism of heat loss or gain to yield a net effect.
	www.capgo.com /Resources/InterestStories/WindChill/WindChill.html (1119 words)

	Wind Chill Factor
		The wind chill factor describes the rate of heat loss from exposed skin due to the combined effects of wind and cold.
		As the wind increases, heat is carried away from the body at an accelerated rate, driving down the body temperature.
		Figure below shows, for instance, that for an air temperature of 10ºF and a wind speed of 35 mph, the cooling power of the moving air is equivalent to that of still air at -35ºF. The wind chill factor is a good way to determine the potential of frostbite or hypothermia.
	csulb.edu /~rtoossi/PhysicsBook/book/Chap20-HeatTransfer/wind_chill.htm (774 words)

	Understanding The Wind Chill Factor & Frostbite (Site not responding. Last check: 2007-10-23)
		Another way to look at the wind chill factor is that it is the temperature a person feels because of the wind.
		Secondly, wind draws away body heat by quickly evaporating any moisture that forms on the skin; the stronger the wind, the greater the evaporation and the colder you feel.
		Find your wind speed in the left-hand column and then read across the row until you find the column that comes closest to matching the actual air temperature (listed in the first row of numbers across the top of the chart).
	www.occunomix.com /utwcf.html (519 words)

	Wind Chill Factor
		For example, if the temperature is 40°F and the wind speed is 20 miles per hour, the wind chill factor is 18°F, but water will not freeze.
		For wind speeds under 5 miles per hour, there is no significant wind chill factor and for wind speeds above 45 miles per hour the wind has no further appreciable effect.
		For wind speeds between 5 mph and 45 mph, the following formula may be used to calculate the wind chill factor -- where t is the temperature in degrees and v is the wind velocity in miles per hour.
	www.math.wichita.edu /~richardson/windchill.html (155 words)

	Wind-chill index is hard to pin down: 2/4/01
		The index typically exaggerates wind chill by as much as 10 degrees because of flaws in the original formula, developed more than 50 years ago by two polar explorers in a long Antarctic night.
		The wind-chill index, also called the wind-chill factor, is a measurement of heat loss in "watts per square meter of exposed skin." Despite that complicated description, the index, supplemented by dress and activity suggestions, is widely used in Canada today.
		Wind increases the rate of heat loss in two ways: It removes a wafer-thin layer of warm air that normally sheathes the body, and it evaporates moisture on the skin, such as sweat, a process that cools the skin's surface.
	www.s-t.com /daily/02-01/02-04-01/a12wn041.htm (1068 words)

	Wind Chill Factor
		When your local meteorologist tells you how warm or cold it is going to be outside, he or she is generally referring to the temperature of the air close to the surface of the Earth.
		To estimate the heat loss based on temperature and wind speeds, the Wind Chill Index is used.
		Wind chill is referred to as an equivalent or sensible temperature, since it is not an actual temperature.
	www.dot.state.al.us /division/div6/WindChillFactor.htm (224 words)

	Wind chill forecast - Safety: forecasting wind chill factor.
		wind chill goes back to the Antarctic explorer Paul A. Siple, who coined it in a study: "Adaptation of the Explorer to the Climate of Antarctica".
		Definition: Wind chill accounts for loss of heat when warm air around a body is replaced with colder air.
		The factor is an indication of the effect of the combination of air temperature and wind speed on human comfort and safety.
	www.sailingissues.com /courses/windchill.html (348 words)

	Wind Chill Factor Calculator
		When the wind is blowing and the temperatures are cold enough (as opposed to a hot summer day) our bodies lose this internally generated heat as the air flowing around us carries the heat away.
		The general basis for the wind chill is that the higher the wind speed and the lower the temperature the colder you will feel because the wind is wicking away the heat from the surface of your skin.
		The wind chill factor comes into effect when the temperature is equal to or less than 4 degrees Celsius and the wind is greater than 8 km/hr.
	www.ottawarun.com /windchill.htm (196 words)

	Wind chill (Site not responding. Last check: 2007-10-23)
		For example, if the temperature is 5 degrees above freezing and the wind is blowing at 15 miles per hour (25 kilometers per hour), the cooling effect on your body is equivalent to the temperature of -25 degrees F (-32 degrees C) in still air.
		This combined effect is commonly called the "wind chill factor" or the "wind chill index." The table on this page shows that the wind chill factor increases with the wind speed, up to a wind speed of 40 miles per hour (67 kilometers per hour).
		The number which appears at that intersection is the equivalent temperature determined by the wind chill factor.
	www.ucar.edu /communications/factsheets/chill.html (276 words)

	eBay - wind chill factor, Audiobooks, Books items on eBay.com (Site not responding. Last check: 2007-10-23)
		Wind Chill Factor by Thomas Gifford (1992) PB
		The Wind Chill Factor by Thomas Gifford (1976) PB
		The Wind Chill Factor by Thomas Gifford 1975
	search-desc.ebay.com /search/search.dll?query=wind+chill+factor&... (328 words)

	New Wind Chill Factor
		For example, if the temperature is 40°F and the wind speed is 40 miles per hour, the wind chill factor is 27°F, but water will not freeze.
		For wind speeds under 5 miles per hour, there is no significant wind chill factor.
		For wind speeds 5 mph and above, the following formula may be used to calculate the wind chill factor -- where t is the temperature in degrees and v is the wind velocity in miles per hour.
	www.math.wichita.edu /~richardson/newwindchill.html (150 words)

	CBC News Indepth: Forces of Nature - Wind Chill
		This means the wind chill factor is not a factor for inanimate objects like rocks, cars and snow – they will all maintain the same temperatures no matter how strongly the winds blow.
		The coldest wind chill recorded in Canada was at Pelly Bay, Nunavut, on January 13, 1975, when 56 km/h winds (a wind chill factor of 3,357 watts/m²) made the temperature of ‑51 C feel more like ‑92 C. The average high temperature in Yellowknife in January is ‑23.9 C. The average low is ‑32.2.
		But because a wind chill factor of 1,500 watts/m² is meaningless to most people, the value was translated to the temperature it would have to be to cause the same degree of heat loss without any wind.
	www.cbc.ca /news/background/forcesofnature/windchill.html (923 words)

	Accuracy of wind chill factor questioned (Site not responding. Last check: 2007-10-23)
		Theoretically, the wind chill index is supposed to measure the rate at which the body loses heat when exposed to cold and wind.
		As a practical matter, the wind chill index is supposed to tell people how warmly to dress, a crucial decision for people who spend long periods outdoors such as construction workers or skiers.
		In addition, the current wind chill index is based on research conducted in the Antarctic in the 1940s.
	www.usatoday.com /weather/wchilpro.htm (1073 words)

	Wind chill factor inaccurate,
		The wind chill temperature equation that most of the world, including Canada, uses tells us that the chill is much chillier than it actually is, according to experts.
		This results in an inaccurate and colder wind chill, he says, because it is a lot less windy on the ground.
		The current wind chill index also ignores other environmental factors such as whether the sun is shining or how much humidity is in the air.
	www.exn.ca /html/templates/printstory.cfm?ID=2000020753 (892 words)

	Wind Chill Factor (Site not responding. Last check: 2007-10-23)
		The "wind chill factor" is the effect of wind and temperature on a dry, adequately clothed person.
		However, if clothing is wet from precipitation, perspiration, or immersion, the net effect of wind and temperature is far greater.
		At the same temperature, in a wind of 40 mph (64 kmh), frostbite occurs in 10 minutes.
	www.mcomd.org /text/windchill.html (129 words)

	wind-chill factor
		It is arrived at by combining the actual temperature and wind speed and is given as a different temperature.
		Wind chill can be calculated in Celsius using the formula:
		where V is in the wind speed in miles per hour and T is the temperature in degrees Fahrenheit.
	www.tiscali.co.uk /reference/encyclopaedia/hutchinson/m0025912.html (277 words)

	Weather -- Wind Chill
		A winter day with a strong wind can seem much colder than one with only a mild wind, though the air temperature may be exactly the same.
		Wind chill can make a fairly moderate winter day equivalent to a much colder one—sometimes dangerously so.
		Calculate the wind chill factor for various combinations of temperature and wind speed using the calculator below.
	www.learner.org /exhibits/weather/act_windchill (175 words)

	Weather Education-Wind Chill Factor
		Wind chill can be described as the effect that wind strength has on making the air feel colder.
		For instance the temperature may be the same on two different days, but if on one of the days the wind is stronger it will feel colder, because air in motion is more effective at dispersing heat than still air.
		The following table shows the effect that wind chill has on making temperatures feel cooler.
	easyweb.easynet.co.uk /~geography.net/kew/chill.htm (73 words)

	WIND CHILL FACTOR CALCULATION
		Not only is knowing wind chill temperature a practically useless exercise for most of us, but we hear that the calculation that has been used, and the one on which this page is based, may be a bit pessimistic and is due for a change.
		Just so we appreciate that wind chill factors might be a little nebulous scientifically, here is another chart (stolen from the National Weather Service web site) of wind chill temperatures.
		We interpret the wind chill temperature to be that temperature in still air that feels the same as the actual temperature in the actual wind.
	www.my-yachtbroker.com /serv03_wind_chill.htm (471 words)

	Wind Chill Factor
		This is due to the interaction of air temperature and wind on the human body that is already giving off heat.
		How do news weather persons know that when there is a 10mph wind with a temperature of 10 degrees F that the real temperature we feel is -9 degrees F? There is a specific formula that can be used to calculate wind chill.
		Use this calculator to determine the actual wind chill given the air temperature and wind speed.
	www.mste.uiuc.edu /dildine/wind_chill/default.html (419 words)

	Weather at IAAT, Astronomy: Wind Chill Factor
		The wind-chill factor is an empirical quantity that was introduced in the 1940s trying to quantify how one feels the current weather.
		The rationale between the wind-chill factor is that due to the stronger evaporative cooling of the human skin during times of larger wind speed the ambient temperature is perceived to be much colder than during times of low wind speeds.
		That we are using non-metric units here is due to the fact that the wind-chill factor is not used a lot outside of the U.S. since the perceived temperature is not a measurable quantity and therefore a rather non-scientific quantity.
	astro.uni-tuebingen.de /~wetter/chill.html (172 words)

	NSiS: Wind Chill
		Wind chill is an indication of quickly your body will lose heat.
		It is determined by the actual temperature and wind speed, which both cause body heat loss.
		For instance, when the actual temperature is 35° Fahrenheit and there is a 10-mph wind, the body loses heat at the rate it would if the temperature was 22° and there was no wind.
	www.nsis.org /weather/windchill.html (85 words)

	Wind chill forecast - Safety: forecasting wind chill factor - sailing Turkey and Greece
		Siple and Charles F. Passel conducted experiments on the time needed to freeze 250 grams of water in a plastic cylinder that was exposed to the elements.
		The factor is an indication of the effect of the combination of air temperature and wind speed on human
		Conclusion: For your safety - even when sailing in the warmer waters of Greece or Turkey: anticipate and use the equivalent temperature to adequately forecast wind chill.
	www.sailingissues.com /windchill.html (387 words)

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