relative_humidity_from_specific_humidity#
- metpy.calc.relative_humidity_from_specific_humidity(pressure, temperature, specific_humidity)[source]#
Calculate the relative humidity from specific humidity, temperature, and pressure.
- Parameters:
pressure (
pint.Quantity
) – Total atmospheric pressuretemperature (
pint.Quantity
) – Air temperaturespecific_humidity (
pint.Quantity
) – Specific humidity of air
- Returns:
pint.Quantity
– Relative humidity
Examples
>>> from metpy.calc import relative_humidity_from_specific_humidity >>> from metpy.units import units >>> relative_humidity_from_specific_humidity(1013.25 * units.hPa, ... 30 * units.degC, 18/1000).to('percent') <Quantity(68.3229304, 'percent')>
See also
Notes
Employs [WMO8] eq. 4.A.16 as derived from WMO relative humidity definition based on vapor partial pressures (eq. 4.A.15).
\[RH = \frac{w}{\epsilon + w} \frac{\epsilon + w_s}{w_s}\]given :math: w = frac{q}{1-q}
\(w\) is mixing ratio
\(w_s\) is the saturation mixing ratio
\(q\) is the specific humidity
\(\epsilon\) is the molecular weight ratio of vapor to dry air
\(RH\) is relative humidity as a unitless ratio
Changed in version 1.0: Changed signature from
(specific_humidity, temperature, pressure)
Examples using metpy.calc.relative_humidity_from_specific_humidity
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Cross Section Analysis
Isentropic Analysis