Hi, everybody. My data is FNL from NCEP. How to use NCL to plot skew plot using these data?

  Hi, everybody. I want to draw skew -t plot using NCL . my data is grib1 My problem is in order to use the function below, one should have the pressure information in every level . skewt_data = skewT_PlotData   (wks, skewt_bkgd, p,tc,tdc,z \                                     , wspd,wdir, dataOpts) Firs, I convert grib1 to netcdf file, and then I  use   commands below to indicate the variable name except the pressure. tc=fin->TMP_3_ISBL_10 u=fin->U_GRD_3_ISBL_10 v=fin->V_GRD_3_ISBL_10 z=fin->HGT_3_ISBL_10 rh= fin->R_H_3_ISBL_10 How to deal with pressure? PS:  my FNL is grib1 type. seems that it did not have pressure information in every level. But in the ctl file for GrADS , it has such lines zdef 26 levels 1000 975 950 925 900 850 800 750 700 650 600 550 500 450 400 350 300 250 200 150 100 70 50 30 20 10 How can I create the pressure information in NCL?  Is anybody has the code to do that , I will be very greatful if you can provide it to me.

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Received on Thu Dec 9 18:13:44 2010