[gradsusr] g2grb help

[Robert Mulloy]

Hi Grads User List I'm looking for some help with g2grb.

I am trying to save 500mb height anomaly fields to a grib file and I've tried the following g2grb commands and all of the files are empty. The script runs w/out issue; the output from the runs are below.

Am I looking for the wrong variable? The input files are 500mb fields with one field being GP500mb and the other being Z500mb. When I run d smth9(GP500mb.1 - Z500mb.2) I get a series of height anomaly maps for all 21 timesteps.  I'm using the default template.grb2 template.

define anomaly=(GP500mb.1 - Z500mb.2)

g2grb anomaly GP_Var.grib d=2024102300:GP:500 mb:24 hour fcst
g2grb anomaly HGT_Var.grib d=2024102300:HGT:500 mb:24 hour fcst

For GP
ga-> g2grb anomaly GP_Var.grib d=2024102300:GP:500 mb:6 hour fcst
dlon=0.25 nx = 1441 lon0 = 0
Y is varying   Lat = -90 to 90   Y = 1 to 721
dlat=0.25 ny = 721 lat0 = -90
new grads found undef=-999000000.000000
making template file
! /home/rm11714/wgrib2 /Archive/grib/template.grb2 -d 1 -lola 0:1441:0.25 -90:721:0.25 GP_Var.grib.template grib
1:0:d=2009080100:var discipline=0 master_table=2 parmcat=255 parm=255:no_level:-2147483647 missing fcst:
opening fwrite GP_Var.grib.tmp
going to display anomaly
result is Wrote 1038961 of 1038961 elements to GP_Var.grib.tmp as Sequential Big_Endian

metadata = 1:0:d=2024102300:GP:500 mb:6 hour fcst:
! /home/rm11714/wgrib2  GP_Var.grib.template -import_ieee GP_Var.grib.tmp -set_metadata GP_Var.grib.inv -undefine_val -999000000.000000 -grib_out GP_Var.grib
1:0:d=2024102300:GP:500 mb:6 hour fcst:

!rm GP_Var.grib.tmp GP_Var.grib.inv
!rm GP_Var.grib.template

For HGT
ga-> g2grb anomaly HGT_Var.grib d=2024102300:HGT:500 mb:6 hour fcst
dlon=0.25 nx = 1441 lon0 = 0
Y is varying   Lat = -90 to 90   Y = 1 to 721
dlat=0.25 ny = 721 lat0 = -90
new grads found undef=-999000000.000000
making template file
! /home/rm11714/wgrib2 /Archive/grib/template.grb2 -d 1 -lola 0:1441:0.25 -90:721:0.25 HGT_Var.grib.template grib
1:0:d=2009080100:var discipline=0 master_table=2 parmcat=255 parm=255:no_level:-2147483647 missing fcst:
opening fwrite HGT_Var.grib.tmp
going to display anomaly
result is Wrote 1038961 of 1038961 elements to HGT_Var.grib.tmp as Sequential Big_Endian

metadata = 1:0:d=2024102300:HGT:500 mb:6 hour fcst:
! /home/rm11714/wgrib2  HGT_Var.grib.template -import_ieee HGT_Var.grib.tmp -set_metadata HGT_Var.grib.inv -undefine_val -999000000.000000 -grib_out HGT_Var.grib
1:0:d=2024102300:HGT:500 mb:6 hour fcst:

!rm HGT_Var.grib.tmp HGT_Var.grib.inv
!rm HGT_Var.grib.template

Thanks for the look

Rob
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