wshr function

Hello,
Can anyone tell me why gddiag needs a 'TMPK' grid to calculate the vertical wind shear of a layer?

GDFILE  = wind.grd
GDOUTF = wind.grd
GFUNC  = wshr(wnd)
GDATTIM = 990101/0000
GLEVEL  = 200:850
GVCORD = PRES
GRDNAM = wshr
GPACK
GDDIAG > r
[DG -7] Input grid TMPK ^990101/0000 @200 %PRES in WSHR cannot be found.

The grid file contains U and V winds at 200 and 850 mb.  Thanks.

Chris

--
--------------------------------------------------------
Christopher C. Hennon
Postdoctoral Fellow
UCAR Visiting Scientist Program

NOAA TPC/National Hurricane Center
11691 SW 17 St.
Miami, FL  33165

Phone: (305) 229-4429
Fax   :   (305) 553-1901
--------------------------------------------------------


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