[gradsusr] Question about theta prime

[Jeff Duda]

The output variable is probably not what you think it is.  In WRF a base
temperature value (usually t0=290) is set, and the full theta field is
based on a perturbation from that value.  So what you are really looking at
when you look at that variable is the distance the potential temperature is
from 290 K (unless you set it otherwise, but 290 is the default value I
think).  For example, if theta prime = 50, then the potential temperature
at that location is 340 K.  You would then use the pressure value to
compute the actual temperature.

Jeff Duda


On Fri, Sep 13, 2013 at 9:01 PM, Nimrod Micael <nmicael at aggies.ncat.edu>wrote:

> I have theta prime or potential temperature perturbation variable
> available to me from WRF. However I am having issues on why it's only
> plotting positive values of theta and not the negative value when I clearly
> did a cross section through the squall line.
>
> theta prime = "perturbation potential temperature (theta-t0)".   Right?
>
> So can you possibly explain what might possibly be wrong? Thanks.
>
>
>
>
> Nimrod Micael
>
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-- 
Jeff Duda
Graduate research assistant
University of Oklahoma School of Meteorology
Center for Analysis and Prediction of Storms
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