For the untraditional meteorologist who thinks the potential temperature is
the natural coordinate, he or she will find the following data available at 00Z.
The monthly means include
Montgomery streamfunction, pressure, potential vorticity,
horizontal winds, mass-weighted horizontal winds on the
270, 280, 290, 300, 315, 330, 350, 400, 450, 550, 650K surfaces.
We didn't forget the potential temperature at the surface either.
note: underground data is masked out