[gradsusr] Freezing Level

[Steve Young]

I am trying to use GrADS to determine the freezing level in meters (or
feet).  I can use the following to determine the upper air surface where
T=273.16 but am unable to figure out how to calculate/extract/determine
HGT(LEV=H). This command gives an error of invalid expression. I welcome any
suggestions.

 

'set gxout shaded'

'H=fndlvl(air, const(air, 273.16), Lev=1000, lev=400)'

'd H'

'run cbar'

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