Steven Decker

> It seems like you would have to keep track of a variable name and its particular vertical coordinate and then append levels as appropriate. I think this is the...

This is the kind of check I am envisioning.

GEMPAK compiles for me. Are the libtool and autoconf packages installed?

This variation doesn't depend on a local file: ```python import datetime import numpy as np import xarray as xr from xarray.backends import NetCDF4DataStore import metpy.calc as mpcalc from metpy.plots import...

Ahh, good find! I do see one gridpoint in the Bahamas where the frontogenesis is NaN; the total deformation is very small there, and I did get a warning: `...

It's in Bluestein 1992 at the bottom of p. 173, the first term of (4.1.98).

This one is tricky because of the time derivative. By the way, it seems the current declarative interface is limited to one time (please correct me if I'm wrong). In...

Would possible implementations be limited to functions? I'm wondering about a calling convention like (my time strings may not be correct syntax): `data.metpy.sel(time=slice('2021-08-24:12:00','2021-08-24:18:00')).ddt(dim='time')` to compute the time derivative for every...

Ahh, I looked at the GEMPAK Conversion Guide too quickly. That looks correct. BTW, what's the proper process to turn the "Tested against GEMPAK" column from red to green? Maybe...

Actually, `metpy.calc.first_derivative` isn't a drop in replacement for `ddt`, as `first_derivative` requires three points, but `ddt` uses only two: https://github.com/Unidata/gempak/blob/92f9a3a8ee667ec49a9082f44380e27f61ca716b/gempak/source/diaglib/df/dfddt.c Given the coarse time resolution in most gridded datasets, this...