2020-09-09|Sunatori's Humidex versus FEELS LIKE

Potential Discovery or Invention

The standard Humidex formula used by Environment and Climate Change Canada is:

humidex = (air temperature) + h [dimensionless]

h = (0.5555)*(e - 10.0);
e = vapour pressure in hPa (mbar), given by:
e = 6.11 * exp[5417.7530 * ( (1/273.15) - (1/dewpoint) ) ]
exp = 2.71828
Dewpoint is expressed in kelvins(K) (temperature in K = temperature in °C + 273.15) and 5417.7530 is a rounded constant based on the molecular weight of water, latent heat of evaporation, and the universal gas constant.

By definition,
(humidex) > (air temperature).
WEATHER according to the Weather app (iOS) on the iPhone shows
(FEELS LIKE) < (air temperature),
so
(FEELS LIKE) <> (humidex).

humidex = (air temperature) + h [dimensionless]
h = (0.5555)(e - 10.0); e = vapour pressure in hPa (mbar), given by: e = 6.11 exp[5417.7530 * ( (1/273.15) - (1/dewpoint) ) ] exp = 2.71828 Dewpoint is expressed in kelvins(K) (temperature in K = temperature in °C + 273.15) and 5417.7530 is a rounded constant based on the molecular weight of water, latent heat of evaporation, and the universal gas constant.

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"Sunatori, Go Simon" <GS.Sunatori@HyperInfo.CA>

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Produced in Canada./Produit au Canada.

ISBN 978-0-929105-04-8

2025-10-15T17:02:53.000Z