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Calculate humidity for METAR data #3

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bergie opened this issue Jun 13, 2017 · 1 comment

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bergie commented Jun 13, 2017

Needed for the forecaster. Formula:

Tc = Temperature in degrees C
Tdc is dewpoint in degrees C

First calcutate saturation vapor pressure (Es) and actual vapor pressure
(E):

Es=6.11*10.0**(7.5*Td/(237.7+Td))
E=6.11*10.0**(7.5*Tdc/(237.7+Tdc))

Relative humidity then becomes (E/Es)*100

https://groups.google.com/forum/#!topic/uk.sci.weather/sIh6-ZV9GjI

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bergie added a commit that referenced this issue


Add TODO on humidity, refs #3

54b5ba7

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bergie commented Nov 2, 2017

Example https://github.com/c-base/c-flo/blob/master/components/AirportWeather.coffee

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