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Message #00002
[Bug 617801] Re: Weather Indicator should show humidex value
** Changed in: weather-indicator
Milestone: None => 11.02.16
** Changed in: weather-indicator
Importance: Undecided => Wishlist
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https://bugs.launchpad.net/bugs/617801
Title:
Weather Indicator should show humidex value
Status in Indicator-Weather:
New
Bug description:
How is the humidex calculated?
A.
The Humidex formula is based on the work of J.M. Masterton and F.A.
Richardson at the Atmospheric Environment Service (now MSC) of
Environment Canada in 1979. It is a standard for Canada, but
variations are used around the world. The dew point temperature should
be given in kelvins (temperature in K = temperature in °C + 273.16)
for the formula to work. The magic number 5417.7530 is a rounded
constant; it's based on the molecular weight of water, latent heat of
evaporation, and the universal gas constant.
e = vapour pressure in hPa (mbar), given by:
e = 6.11 * exp [5417.7530 * ( (1/273.16) - (1/dewpoint) ) ]
h = (0.5555)*(e - 10.0);
humidex = (air temperature) + h
from Environment Canada web site