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<div>Hi,</div>
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<div>I’m running into an issue with the resulting grib1 file produced from converting a long range (>=264 hr forecast) GFS grib2 file with the cnvgrib utility.</div>
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<div>I’ve attached the initial grib2 file I’m working with as an example - this file contains only my variables of interest.</div>
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<div>I want to convert this file to grib1, which I do using the following:</div>
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<div>1.) wgrib2 gfslr2015111912hr384.grb2 -grib temp.grb2</div>
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<div>2.) cnvgrib -g21 temp.grb2 gfslr2015111912hr384.grb</div>
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<div>When I run wgrib on the file grib1 file, it gives the following output:</div>
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<div>1:0:d=15111912:TMP:kpds5=11:kpds6=105:kpds7=2:TR=10:P1=1:P2=128:TimeU=1:2 m above gnd:384hr fcst:NAve=0</div>
<div>2:114114:d=15111912:RH:kpds5=52:kpds6=105:kpds7=2:TR=10:P1=1:P2=128:TimeU=1:2 m above gnd:384hr fcst:NAve=0</div>
<div>3:195648:d=15111912:UGRD:kpds5=33:kpds6=105:kpds7=10:TR=10:P1=1:P2=128:TimeU=1:10 m above gnd:384hr fcst:NAve=0</div>
<div>4:301616:d=15111912:VGRD:kpds5=34:kpds6=105:kpds7=10:TR=10:P1=1:P2=128:TimeU=1:10 m above gnd:384hr fcst:NAve=0</div>
<div>5:407584:d=15111912:APCP:kpds5=61:kpds6=1:kpds7=0:TR=4:P1=116:P2=128:TimeU=1:sfc:<b>116-128hr
</b>acc:NAve=0</div>
<div>6:513552:d=15111912:CSNOW:kpds5=143:kpds6=1:kpds7=0:TR=3:P1=116:P2=128:TimeU=1:sfc:<b>116-128hr</b> ave:NAve=0</div>
<div>7:521780:d=15111912:CICEP:kpds5=142:kpds6=1:kpds7=0:TR=3:P1=116:P2=128:TimeU=1:sfc:<b>116-128hr</b> ave:NAve=0</div>
<div>8:530008:d=15111912:CFRZR:kpds5=141:kpds6=1:kpds7=0:TR=3:P1=116:P2=128:TimeU=1:sfc:<b>116-128hr</b> ave:NAve=0</div>
<div>9:538236:d=15111912:LFTX:kpds5=131:kpds6=1:kpds7=0:TR=10:P1=1:P2=128:TimeU=1:sfc:384hr fcst:NAve=0</div>
<div>10:611624:d=15111912:CAPE:kpds5=157:kpds6=1:kpds7=0:TR=10:P1=1:P2=128:TimeU=1:sfc:384hr fcst:NAve=0</div>
<div>11:717592:d=15111912:PWAT:kpds5=54:kpds6=200:kpds7=0:TR=10:P1=1:P2=128:TimeU=1:atmos col:384hr fcst:NAve=0</div>
<div>12:799126:d=15111912:TCDC:kpds5=71:kpds6=10:kpds7=0:TR=3:P1=116:P2=128:TimeU=1:atmos col:<b>116-128hr</b> ave:NAve=0</div>
<div>13:856224:d=15111912:PRMSL:kpds5=2:kpds6=102:kpds7=0:TR=10:P1=1:P2=128:TimeU=1:MSL:384hr fcst:NAve=0</div>
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<div>I’ve put in bold the the issues I’m seeing - those variables are giving me undefined values when I try to plot them, which I assume is due to the above issue.</div>
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<div>I think #43 at the following link describes this problem, so it seems to be a known issue:</div>
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<div><a href="http://ftp.cpc.ncep.noaa.gov/wd51we/wgrib2/tricks.wgrib2">http://ftp.cpc.ncep.noaa.gov/wd51we/wgrib2/tricks.wgrib2</a></div>
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<div>I tried running the suggestion in #43 on my initial grib2 file, then ran cnvgrib but I get the same bad results with the grib1 file.</div>
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<div>Is their another workaround to this problem I could try?</div>
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<div>The versions of the utilities I’m running are below:</div>
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<div>wgrib2 v0.1.9.4</div>
<div>wgrib v1.8.0.13f</div>
<div>cnvgrib-1.1.4</div>
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<div>Thanks for any help you can provide.</div>
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<div>Cheers,</div>
<div>Sam</div>
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