Temp at PBL height

[Matt Alonso]

Howdy folks,

OK this is going to be a messy one.  One of the fields I have in my
model output is PBL height.  I also have the 2m temp and the temp (as
well as other variables) at various pressure levels.  Does anyone have
an equation that could derive the temp at the PBL height?  I am
assuming it is something that is best done outside of grads (ie in a
FORTRAN program) but I figured it was worth a shot.  Thanks in advance.

Matt