[gradsusr] Skewt-logP on grads with WRF

[Zilore Mumba]

Dear Grads Users,
For those who are able to plot a profile with WRf output, I appreciate any
help. When I run plotskew.gs I get errors mostly with the following
variables which are in the script:
snddewp and dewpx (the error also mentions (lev,+300)).
Any help will be appreciated.
The errors are reproduced below
ga-> run plotskew.gs
Syntax Error:  Invalid Operand
  'snddewp' not a variable or function name
  Error ocurred at column 2
DEFINE error:  Invalid expression.
Drawing temperature sounding.
Drawing dewpoint sounding.
Syntax Error:  Invalid Operand
  'dewpx' not a variable or function name
  Error ocurred at column 1
DISPLAY error:  Invalid expression
  Expression = dewpx
Syntax Error:  Expected operand or '('
Operation Error:  Error from maskout function
  Error ocurred at column 1
DISPLAY error:  Invalid expression
  Expression = maskout(lev,+300)
SET error:  Missing or invalid arguments for LEV option
Display command error:  No expression provided
Syntax Error:  Invalid Operand
  'snddewp' not a variable or function name
  Error ocurred at column 1
DISPLAY error:  Invalid expression
  Expression = snddewp
Non-numeric args to numeric operation
Error occurred processing function arguments
  Error occurred on line 1980
  In file /usr/local/grads-2.0.2/scripts/plotskew.gs
  Error occurred on line 2215
  In file /usr/local/grads-2.0.2/scripts/plotskew.gs
  Error occurred on line 994
  In file /usr/local/grads-2.0.2/scripts/plotskew.gs
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