Interpolator assumes ordering of height levels

[grantbuster]

Interpolator for vertical wind assumes index=0 is the min elevation but this isn't always true (e.g. ERA has index=-1 as min elevation). Raises lots of warnings. I don't think this is actually a bug because the actual interp function should work with either sorting, but warnings are scary.

sup3r/sup3r/utilities/interpolation.py

Line 214 in 7ea63c8

bad_max = max(levels) > lev_array[:, -1, :, :]

sup3r/sup3r/utilities/interpolation.py

Line 274 in 7ea63c8

[interp1d(h[mask], var[mask], fill_value='extrapolate')(levels)