Inverted vapor pressure and saturation vapor pressure

[nicomignoni]

Hi! Unless I'm missing something, in atmosphere.py:378 the vapor pressure and saturation vapor pressure are inverted: it should be

relative_humidity = 100 * (e / es)

as per Guide to Meteorological Instruments and Methods of Observation at page 91 of the PDF.

[AdamRJensen]

I agree that this seems like a bug. Thanks for reporting @nicomignoni!

The equation was implemented in #2286 .

The below equations are from page 194 in https://library.wmo.int/idurl/4/68695

with

[echedey-ls]

Beware of affected tdew_from_rh too, at least this comment and possibly the implementation:

pvlib-python/pvlib/atmosphere.py

Lines 409 to 411 in cf49dea

	# Calculate the term inside the log
	# From RH = 100 * (es/e), we get es = (RH/100) * e
	# Substituting the Magnus equation and solving for dewpoint