def calc_lcl(row, psfc):
"""
find the lcl (in m) for a row in the dataframe
"""
Tdew = tf.tmr(row['qv'], psfc)
LCL = tf.LCL(Tdew, row['theta'], psfc) #kPa
#
# rough approximation: 10 kPa = 1 km
#
delp = psfc - LCL
lcl_h = delp * 100.
return lcl_h
import pandas as pd
Temp=280. #K
press=90. #kPa
#
# find the saturation mixing ratio and potential temp from the temperature and pressure
#
print(tf.qs_tp(Temp,press))
print(tf.find_theta(Temp,press))
#
# find the dew point temperature and the lifting condensation level
#
psurf=100. #kPa
Tsurf=290.
qvap=7.e-3 #kg/kg
Tdew = tf.tmr(qvap,psurf)
print('the surface dew point temp is: ',Tdew)
LCL = tf.LCL(Tdew,Tsurf,psurf)
print('the LCL is {:5.2f} kPa'.format(LCL))
#
# find thetal
#
thetal = tf.alt_thetal(psurf,Tsurf,qvap)
#
# invert thetal for temperature, vapor, liquid -- uos means "unsaturated or saturated"
#
print(tf.t_uos_thetal(thetal,qvap,80.))
#
# make a sounding
#