Just wondering....
Is the Heat Index in WC calculated?
If so, is it done the same way that it is done in Aus as shown below from the BoM site:
About the formula for the apparent temperature
The formula for the AT used by the Bureau of Meteorology is an approximations of the value provided by a mathematical model of heat balance in the human body. It can include the effects of temperature, humidity, wind-speed and radiation. Two forms are given, one including radiation and one without. On this site we use the non-radiation version.
Version including the effects of temperature, humidity, and wind:
AT = Ta + 0.33?e − 0.70?ws − 4.00
Version including the effects of temperature, humidity, wind, and radiation:
AT = Ta + 0.348?e − 0.70?ws + 0.70?Q/(ws + 10) − 4.25
where:
Ta= Dry bulb temperature (?C)
e= Water vapour pressure (hPa) [humidity]
ws= Wind speed (m/s) at an elevation of 10 meters
Q= Net radiation absorbed per unit area of body surface (w/m2)
The vapour pressure can be calculated from the temperature and relative humidity using the equation:
e = rh / 100 ? 6.105 ? exp ( 17.27 ? Ta / ( 237.7 + Ta ) )
where:
rh= Relative Humidity [%]
Source: Norms of apparent temperature in Australia, Aust. Met. Mag., 1994, Vol 43, 1-16
Col.
