I set up a formula in IDV to plot thermal wind vectors, a la:
<derived description="thermal wind in a 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 Tyle, Systems Administrator
Dept. of Atmospheric & Environmental Sciences
University at Albany
Earth Science 235, 1400 Washington Avenue
Albany, NY 12222