[idvusers] Problem with plotting thermal wind vectors from GRIB2 files

Hi all,

I set up a formula in IDV to plot thermal wind vectors, a la:
<derived description="thermal wind in a layer" formula="thrm(F1,user_Top_of_Layer[default=500],user_Bottom_of_Layer [default=1000])" id="thermalWind" isdefault="false" isenduser="true">

Whenever I do this on a GRIB2 format grid file, e.g. realtime NAM or GFS from the motherlode or atm-nsf opendap servers, I end up with all missing data when I load in the formula, specify my levels, and choose the 3D geopotential height from the GRIB2 file.

If I do the same on the same model data that has been converted to GEMPAK, and also with the sample model data used in the IDV Workshop (which I believe is GRIB1), the thermal wind vectors plot fine.

I suspect there is some issue specifically related to GRIB2 format here ...

Thanks for looking into this!

--Kevin

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Kevin Tyle, Systems Administrator
Dept. of Atmospheric & Environmental Sciences
University at Albany
Earth Science 235, 1400 Washington Avenue
Albany, NY 12222
Email: ktyle@xxxxxxxxxx
Phone: 518-442-4578
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