Inheritance diagram for meteo_utils.meteo_utils:

Collaboration diagram for meteo_utils.meteo_utils:

Public Member Functions
def	__init__ (self)

def	specific_humidity (self, dewp_K, pres_Pa)

def	r_sub_s (self, pres_Pa, temp_K)

def	e_sub_s (self, temp_K)

def	r_sub_i (self, pres_Pa, temp_K)

def	e_sub_i (self, temp_K)

def	std_atmos (self, pres_Pa)

def	std_atmos_p (self, height)

def	precipitable_water (self, pres_Pa, w_non)

def	dir_speed_2_uv (self, wdir, wspd)

def	altim_2_sfcPressure (self, altim, elev)

def	theta_e (self, pres_Pa, temp_K, w_non, tlcl_K)

def	t_lcl (self, temp_K, tdew_K)

def	t_dew (self, pres_Pa, w_non)

def	theta_wetb (self, thetae_K)

def	compT_fr_The (self, thelcl_K, pres_Pa)

Public Attributes
	PI

	DEG_2_RAD

	C_2_K

	MS_2_KTS

	KTS_2_MS

	inHg_2_Pa

	STP_P

	STP_T

	STP_rho_air

	FT_2_M

	R

	Cp

	LAPSE

	g

	RHO_WATER

Detailed Description

Definition at line 15 of file meteo_utils.py.

Constructor & Destructor Documentation

◆ init()

def meteo_utils.meteo_utils.__init__ ( self )

Definition at line 18 of file meteo_utils.py.

Member Function Documentation

◆ altim_2_sfcPressure()

def meteo_utils.meteo_utils.altim_2_sfcPressure	(	self,
		altim,
		elev
	)

From altimeter (inches of mercury, Hg), and station elevation (m),
compute surface pressure returned in Pascals.

Definition at line 216 of file meteo_utils.py.

◆ compT_fr_The()

def meteo_utils.meteo_utils.compT_fr_The	(	self,
		thelcl_K,
		pres_Pa
	)

pres_Pa = Pressure in Pascals
thelcl  = Theta-e at LCL (units in Kelvin)
Temperature (K) is returned given Theta-e at LCL
and a pressure.  This describes a moist-adiabat.
This temperature is the parcel temp at level Pres
along moist adiabat described by theta-e.

Definition at line 318 of file meteo_utils.py.

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◆ dir_speed_2_uv()

def meteo_utils.meteo_utils.dir_speed_2_uv	(	self,
		wdir,
		wspd
	)

From wind direction and speed, compute u,v wind components

Definition at line 203 of file meteo_utils.py.

◆ e_sub_i()

def meteo_utils.meteo_utils.e_sub_i	(	self,
		temp_K
	)

compute saturation vapor pressure (Pa) over ice with
polynomial fit of Goff-Gratch (1946) formulation. (Walko, 1991)

Definition at line 129 of file meteo_utils.py.

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◆ e_sub_s()

def meteo_utils.meteo_utils.e_sub_s	(	self,
		temp_K
	)

compute saturation vapor pressure (Pa) over liquid with
polynomial fit of Goff-Gratch (1946) formulation. (Walko, 1991)

Definition at line 77 of file meteo_utils.py.

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◆ precipitable_water()

def meteo_utils.meteo_utils.precipitable_water	(	self,
		pres_Pa,
		w_non
	)

Input is a column ordered with lowest index is physically lower in the atmosphere (pressure decreasing as the index increases).
pres_Pa = Pressure in Pascals
w_non   = mixing ratio (non-dimensional = kg/kg)
returned precipitable water value in meters only below 150mb

Definition at line 181 of file meteo_utils.py.

◆ r_sub_i()

def meteo_utils.meteo_utils.r_sub_i	(	self,
		pres_Pa,
		temp_K
	)

compute saturation mixing ratio (kg/kg) by calling function
to calculate saturation vapor pressure over ice.
pres_Pa - pressure (pa)
temp_K  - temperature (k)

Definition at line 107 of file meteo_utils.py.

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◆ r_sub_s()

def meteo_utils.meteo_utils.r_sub_s	(	self,
		pres_Pa,
		temp_K
	)

compute saturation mixing ratio (kg/kg) by calling function
to calculate saturation vapor pressure over water.
pres_Pa - pressure (pa)
temp_K  - temperature (k)

Definition at line 55 of file meteo_utils.py.

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◆ specific_humidity()

def meteo_utils.meteo_utils.specific_humidity	(	self,
		dewp_K,
		pres_Pa
	)

Function to compute specific humidity
Required input variables are dewpoint (K) and surface pressure (Pa)
From dewpoint a simple water vapor mixing ratio is calculated, then
specific humidity is r/(1.+r)

Definition at line 39 of file meteo_utils.py.

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◆ std_atmos()

def meteo_utils.meteo_utils.std_atmos	(	self,
		pres_Pa
	)

standard atmos height in meters is returned for given p in Pascals

Definition at line 157 of file meteo_utils.py.

◆ std_atmos_p()

def meteo_utils.meteo_utils.std_atmos_p	(	self,
		height
	)

standard atmos pressure in Pascals is returned for given height in meters

Definition at line 169 of file meteo_utils.py.

◆ t_dew()

def meteo_utils.meteo_utils.t_dew	(	self,
		pres_Pa,
		w_non
	)

I cannot recall the original source of this function
    pres_Pa = Pressure in Pascals
    w_non   = mixing ratio (non-dimensional = kg/kg)

Definition at line 276 of file meteo_utils.py.

◆ t_lcl()

def meteo_utils.meteo_utils.t_lcl	(	self,
		temp_K,
		tdew_K
	)

The following code was based on Bolton (1980) eqn #15
 and claims to have 0.1 K maximum error within -35 < T < 35 C
    temp_K  = Temperature in Kelvin
    tdew_K  = Dewpoint T at Lifting Condensation Level (K)

Definition at line 258 of file meteo_utils.py.

◆ theta_e()

def meteo_utils.meteo_utils.theta_e	(	self,
		pres_Pa,
		temp_K,
		w_non,
		tlcl_K
	)

The following code was based on Bolton (1980) eqn #43
 and claims to have 0.3 K maximum error within -35 < T < 35 C
    pres_Pa = Pressure in Pascals
    temp_K  = Temperature in Kelvin
    w_non   = mixing ratio (non-dimensional = kg/kg)
    tlcl_K  = Temperature at Lifting Condensation Level (K)

Definition at line 230 of file meteo_utils.py.

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◆ theta_wetb()

def meteo_utils.meteo_utils.theta_wetb	(	self,
		thetae_K
	)

Eqn below was gotten from polynomial fit to data in
 Smithsonian Meteorological Tables showing Theta-e
 and Theta-w

Definition at line 294 of file meteo_utils.py.

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Member Data Documentation

◆ C_2_K

meteo_utils.meteo_utils.C_2_K

Definition at line 23 of file meteo_utils.py.

◆ Cp

meteo_utils.meteo_utils.Cp

Definition at line 32 of file meteo_utils.py.

◆ DEG_2_RAD

meteo_utils.meteo_utils.DEG_2_RAD

Definition at line 22 of file meteo_utils.py.

◆ FT_2_M

meteo_utils.meteo_utils.FT_2_M

Definition at line 30 of file meteo_utils.py.

◆ g

meteo_utils.meteo_utils.g

Definition at line 34 of file meteo_utils.py.

◆ inHg_2_Pa

meteo_utils.meteo_utils.inHg_2_Pa

Definition at line 26 of file meteo_utils.py.

◆ KTS_2_MS

meteo_utils.meteo_utils.KTS_2_MS

Definition at line 25 of file meteo_utils.py.

◆ LAPSE

meteo_utils.meteo_utils.LAPSE

Definition at line 33 of file meteo_utils.py.

◆ MS_2_KTS

meteo_utils.meteo_utils.MS_2_KTS

Definition at line 24 of file meteo_utils.py.

◆ PI

meteo_utils.meteo_utils.PI

Definition at line 21 of file meteo_utils.py.

◆ R

meteo_utils.meteo_utils.R

Definition at line 31 of file meteo_utils.py.

◆ RHO_WATER

meteo_utils.meteo_utils.RHO_WATER

Definition at line 35 of file meteo_utils.py.

◆ STP_P

meteo_utils.meteo_utils.STP_P

Definition at line 27 of file meteo_utils.py.

◆ STP_rho_air

meteo_utils.meteo_utils.STP_rho_air

Definition at line 29 of file meteo_utils.py.

◆ STP_T

meteo_utils.meteo_utils.STP_T

Definition at line 28 of file meteo_utils.py.

The documentation for this class was generated from the following file:

meteo_utils.py

Public Member Functions

Public Attributes

Detailed Description

Constructor & Destructor Documentation

◆ __init__()

Member Function Documentation

◆ altim_2_sfcPressure()

◆ compT_fr_The()

◆ dir_speed_2_uv()

◆ e_sub_i()

◆ e_sub_s()

◆ precipitable_water()

◆ r_sub_i()

◆ r_sub_s()

◆ specific_humidity()

◆ std_atmos()

◆ std_atmos_p()

◆ t_dew()

◆ t_lcl()

◆ theta_e()

◆ theta_wetb()

Member Data Documentation

◆ C_2_K

◆ Cp

◆ DEG_2_RAD

◆ FT_2_M

◆ g

◆ inHg_2_Pa

◆ KTS_2_MS

◆ LAPSE

◆ MS_2_KTS

◆ PI

◆ R

◆ RHO_WATER

◆ STP_P

◆ STP_rho_air

◆ STP_T

◆ init()