cal_wetbulb.Rd
wetbulb temperature
cal_wetbulb(Tair, Tdew, Pa = atm) cal_Tw(ea, Tair, Pa = atm)
2m air temperature (degC)
surface air pressure (kPa)
Actual vapor pressure (kPa)
https://github.com/wrf-model/WRF/blob/master/phys/module_diag_functions.F#L1154