test the WRF_track_1.ncl,something wrong

Dear NCL users,

   I down load the WRF_track_1.ncl from

  http://www.ncl.ucar.edu/Applications/Scripts/WRF_track_1.ncl

  and the data form

  
http://www.ncl.ucar.edu/Applications/Data/cdf/wrfout_d01_2003-07-15_00:00:00,

  I didn't change anything in the script, But there are something wrong
like following:

  Copyright (C) 1995-2007 - All Rights Reserved
 University Corporation for Atmospheric Research
 NCAR Command Language Version 5.0.0
 The use of this software is governed by a License Agreement.
 See http://www.ncl.ucar.edu/ for more details.
Troubles finding level 100 above ground.
Problems first occur at ( 32, 1)
Surface pressure = nan hPa.
STOP Error_in_finding_100_hPa_up statement executed

 Could anybody tell me what's wrong in that?

 Thanks a lot!

Qing
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Received on Sat Jan 05 2008 - 22:02:12 MST