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Patrick, It's not the lack of glue. The helicity is not there. It was removed during a change to the GFS in May 2012. The full TIN is available at :http://www.nws.noaa.gov/os/notification/tin12-22gfs_hybridaab.htm but the part of interest to you is this wording: 1km helicity will be removed from the 0.5, 1 and 2.5 degree pressure GRIB files. This field was added to these files by mistake during a previous implementation. Becky Cosgrove NCEP Central Ops On 3/27/2013 9:42 AM, Patrick L.
Francis wrote:
Something has changed with conduit GFS =-O in October 2011, 0-1km helicity was included in the conduit stream and decoded by gempak. note gdinfo from 2011: http://modelweather.com/files/grids/gfs/006_2k11.txt 45 111005/0000F006 1000 0 HGHT HLCY yet this morning when i went to use the grid it isn't there :'( note gdinfo from this morning: http://modelweather.com/files/grids/gfs/006.txt Has anyone else noticed the same thing, or did I just pick the wrong day to quit sniffing glue :-) cheers, --patrick |
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