How to Calculate a Wind Chill Factor
Mar 30, · The historic wind chill calculation formula was T(wc) = times ( multiplied by the square root of the wind speed plus minus multiplied by wind speed) times (temperature minus ) plus The wind chill index is a method that compensates for the wind chill factor using wind speed to calculate a measurement called the wind chill temperature (WCT). The wind chill temperature measurement is a more realistic number in terms of how the cold feels to human skin. This is essential information for anyone gearing up to work or play outdoors. For additional safety, the method also .
Showers and thunderstorms may produce flash flooding in northern and central Florida into Tuesday; and gusty winds and hail are also possible across the area Sunday. A strong cold front will bring below average temperatures and wintry precipitation to the northern High Plains.
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Please try another search. Multiple locations were found. Please select one of the following:. Location Help. Flash Flood Threat Shifts to Florida; Snowy in the Northern Plains; Fire Danger in the West Showers and thunderstorms may produce win flooding in northern and central Florida into Tuesday; and gusty winds and hail are also possible across the area Sunday.
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Enter a temperature and wind speed that you would like calculated: What the temperature feels like to your body: Fahrenheit Celsius. ° F. mph knots m/s k/h. ° C. Watts per Meter Squared. The wind chill calculator only works for temperatures at or below 50 ° F and wind speeds above 3 mph. Feb 01, · Wind chill factor and humidex are not comfort issues; they are health and safety indexes. If a thermometer reads 35 degrees Fahrenheit outside and the wind is blowing at 25 miles per hour (mph), the windchill factor causes it to feel like it is 8 degrees F. In other words, your degree body loses heat as though it is 8 degrees outside.
During a weather report in the middle of a blustery winter, a meteorologist will often mention wind chill factor along with the high and low temperatures of the day. Wind chill factor gives a sense of how the weather feels versus the actual temperature. When the temperature drops near freezing, it is possible that a low wind chill factor could make the air feel below freezing. Wind chill factor was designed for a limited purpose.
It measures heat loss from exposed areas of the human body, like hands and face, in low temperatures and measured wind speeds. With this information, people venturing outside in exceptionally bitter weather would know an approximate time before exposed areas of the body would succumb to frostbite. Siple and Passel were measuring the effect of how wind blowing can cause an object to lose heat at a quicker rate.
The scientists placed water bottles out in the elements and studied the freezing rates in varying wind speeds and temperatures. The scientists measured the wind chill factor in kilocalories per hour per square meter, a confusing measurement for anyone outside their field.
In the s, the United States military sought to express the measurement in terms of temperature. By the s, wind chill equivalent temperatures were a common feature of weather reports. However, the calculated wind chill factor was not always accurate. Canadian scientist Randall Osczevski reformatted the wind chill factor formula in with modern models of heat loss from the human body. The new formula for wind chill factor was developed partly by experiment.
Human subjects were wired for heat temperature loss as they walked in a cold wind tunnel. To calculate wind chill factor, it requires an anemometer, an instrument for measuring the speed of the wind, and a thermometer. Once readings are made, place the values of V and T into the correct formula. Example: Calculate wind chill factor for a temperature of minus 20 degrees Fahrenheit and a wind speed of 55 miles per hour.
Place the values in for T and V where W T, V is the wind chill factor at a particular temperature and wind speed:. Wind chill tables and calculators exist on the internet; refer to the Resources section for examples. Note that charts will outline how many minutes before frostbite can occur. For example, at 0 degrees Fahrenheit with a wind chill factor of 30 miles per hour, the frostbite time is 30 minutes. If the wind picks up to 60 miles an hour at 0 degrees Fahrenheit, the frostbite time drops to 10 minutes.
Rosann Kozlowski is currently a freelance writer and tutor. She has a Master's Degree in Chemistry from the University of Oregon and has previously worked in the pharmaceutical industry and has taught at the middle school, high school, and college levels. You can make your own anemometer and calculate wind speed and wind chill factor.
However, simple calculator tools are available online from the National Weather Service and other sites, so if time is of the essence and you already know the wind speed and temperature at your location, using one of these tools is a simpler option. The National Weather Service decommissioned this formula and its associated charts because they overestimated weather severity by failing to take into account human motion and constant minimum levels of air movement.
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