Possible bug in wrf_td fuction

The Problem:

        I have been using the wrf_usr_getvar function to calculated and
        plot dew point temperature from WRF-ARW output (and input)
        files. When plotting the dew point temp in vertical profiles I
        have found strange behavior in the upper atmosphere (near 100
        mb). This strange behavior includes the same value of dew point
        temp (approx -80 degrees Celsius) at numerous sigma levels. The
        relative humidity extracted with the wrf_usr_getvar function
        does not show the supersaturations implied by these strange dew
        point temp reading in the upper atmosphere.

Error Messages:

        There is no error message associated with this problem.

My Thoughts:

        The wrf_usr_getvar seems to call the wrf_td function for its dew
        point temperature calculation. I have been unable to locate the
        source code for this wrf_td function but suspect this is the
        source of the strange dew point temp values.

Background Info:

        1) Name of WRF data file: wrfinput_d01--bug-wrf_td.gz
        (NOTE: I am giving the wrfinput file because it is smaller and
        has the same issue as the wrfout file)
        2) Name of NCL scripts: plot-dewpt--bug-wrf_td.ncl &
        plot-rh--bug-wrf_td.ncl
        3) NCL version: 5.2.1
        4) uname -a: Linux fe-inform
        2.6.18-194.32.1.el5 #1 SMP Wed Jan 5 17:52:25 EST 2011 x86_64
        x86_64 x86_64 GNU/Linux
        

MJ

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Received on Thu May 26 13:02:46 2011