wind chill temperature index
- (WCTI)a measurement of the combined cooling effect of low air temperature and wind on the human body. The index was first defined by the American Antarctic explorer Paul Siple in 1939. As originally used by U.S. meteorologists, the wind chill index (WCI) was computed from the temperature T (in °F) and wind speed V (in mi/hr) using the formula: WCI = 0.0817(3.71 sqrt(V) + 5.81 - 0.25V)(T - 91.4) + 91.4.In 2001, U.S. and Canadian meteorologists agreed on a revised definition of the wind chill temperature index (WCTI). The U.S. version, with the temperature in °F and wind speed in miles per hour, is WCTI = 35.74 + 0.6215T - 35.75V0.16 + 0.4275TV0.16.The Canadian formula, with temperatures in °C and wind speed in km/h, isWCTI = 13.12 + 0.6215T - 11.37V0.16 + 0.3965TV0.16.A chart is provided. The new formula gives higher temperatures, but these temperatures, unlike the old WCI numbers, are supported by clinical experiments.
Dictionary of units of measurement. 2015.
Look at other dictionaries:
Wind chill — This page is for the meteorological effect of wind chill. For the film, see Wind Chill. Wind chill is the apparent temperature felt on exposed skin, which is a function of the air temperature and wind speed. The wind chill temperature (often… … Wikipedia
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… … Universalium
wind chill factor — n. index that takes into account the effect of wind on the temperature to provide a reading of the apparent temperature … English contemporary dictionary
Wind — For other uses, see Wind (disambiguation). Wind, from the … Wikipedia
Temperature — This article is about the thermodynamic property. For other uses, see Temperature (disambiguation). A map of global long term monthly average surface air temperatures i … Wikipedia
Heat index — The heat index (HI) is an index that combines air temperature and relative humidity in an attempt to determine the human perceived equivalent temperature how hot it feels, termed the felt air temperature. The human body normally cools itself by… … Wikipedia
Sea surface temperature — Weekly average sea surface temperature for the World Ocean during the first week of February 2011, during a period of La Niña … Wikipedia
Dry-bulb temperature — The dry bulb temperature is the temperature of air measured by a thermometer freely exposed to the air but shielded from radiation and moisture. Dry bulb temperature is the temperature that is usually thought of as air temperature, and it is the… … Wikipedia
Convective temperature — The convective temperature (CT or Tc) is the approximate temperature that air near the surface must reach for cloud formation without mechanical lift. In such case, cloud base begins at the convective condensation level (CCL), whilst with… … Wikipedia
Apparent temperature — is the general term for the perceived outdoor temperature, caused by the combined effects of air temperature, relative humidity and wind speed.*The Heat index measures the effect of humidity on the perception of temperature. In humid conditions,… … Wikipedia