Precip Extraction

The following job is used to extract 500mb level GPH data. A levtpye and levelist need to be defined. If say, several levels were required you would used something like : levelist=200/500/850/1000

mars << EOF
retrieve,
    levelist=500,
        stream=smma,
        system=2,
        method=1,
        number=0/to/4,
        time=00,
        levtype=pl,
        expver=1,
        param=129,
        fcmonth=1/2/3/4/5/6,
        class=od,
        date=20020801,
        type=fcmean,
    TARGET="$SCRATCH/plevel[levelist]_129_2002_08start_em[number].grib"
EOF