[gradsusr] regridding issues with lats4d

[Fishel, Greg]

I am extremely new to Grads, so I apologize in advance if this question
seems too basic. I work for a television station, and am always
experimenting with getting different datasets on the air. Unfortunately,
our graphics system does not care for the gaussian grids. So I am
attempting to use lats4d to interpolate some of the cfs products onto a
standard gfs grid. My script is not giving me any error messages but the
grib file being written is empty. Below is my bash script. The data
downloads fine, and control and index files are created for both the cfs
and gfs without any issues. Any help would be much appreciated. Thanks!

cd $MODEL/gfs

#----------------------------------------------DOWNLOAD CFS AND GFS SNOW
DEPTH FORECASTS FOR A SINGLE TIME--------------------------------------

wget -O gfs.snow.grib2
"http://nomads.ncep.noaa.gov/cgi-bin/filter_gfs_hd.pl?file=gfs.t12z.masterg
rb2f00&lev_surface=on&\
var_SNOD=on&leftlon=0&rightlon=360&toplat=90&bottomlat=-90&dir=%2Fgfs.20121
12912%2Fmaster"

MOD_URL="http://nomads.ncep.noaa.gov/pub/data/nccf/com/cfs/prod/cfs/cfs.201
21129/12/6hrly_grib_01/ocnf2012121100.01.2012112912.grb2"
MOD_URL_IDX="http://nomads.ncep.noaa.gov/pub/data/nccf/com/cfs/prod/cfs/cfs
.20121129/12/6hrly_grib_01/ocnf2012121100.01.2012112912.grb2.idx"

get_inv.pl $MOD_URL_IDX | grep ":SNOD:surface" | get_grib.pl $MOD_URL
cfs.snow.grib2


#-------------------------CREATE CONTROL AND INDEX FILES FOR CFS AND GFS
DATA-----------------------------------------------------------------------
----


g2ctl gfs.snow.grib2 > gfs.snow.grib2.ctl
gribmap -v -i gfs.snow.grib2.ctl

#-----------------CREATE GRADS
FILES----------------------------------------------------------------------
-----------------------------------------

g2ctl cfs.snow.grib2 > cfs.snow.grib2.ctl
gribmap -v -i cfs.snow.grib2.ctl


#---------------------------INTERPOLATE CFS DATA ONTO GFS
GRID-----------------------------------------------------------------------
--------




lats4d.sh -i cfs.snow.grib2.ctl -vars snodsfc -o cfs.snow.newgrid.grib2
-format grib -de gfs.snow.grib2.ctl