Clean-ups for skewt tests.
Clean-ups for skewt tests.

Unidata/MetPy,ShawnMurd/MetPy,deeplycloudy/MetPy,jrleeman/MetPy,ahill818/MetPy,ahaberlie/MetPy,jrleeman/MetPy,dopplershift/MetPy,dopplershift/MetPy,ahaberlie/MetPy,Unidata/MetPy