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I noticed that the absolute values obtained from loading wind_u and wind_uv are the same, as thoughwind_uv is simply the square root of wind_u squared. To confirm, when I load wind_v itself, there are reasonable looking values (e.g. not 0).

I haven't been able to track down where this problem is arising in the source code.

I am using Kadlu version 2.2.3 installed from PyPI on macOS Mojave (10.14.6) with the most recent version of Python (Anaconda 3.8.5).

The code block below provides a minimal example to reproduce this behavior, with the output of the cell being True.

kw = dict(start=datetime(2016, 3, 9) , end=datetime(2016,3,11),
          south=44.5541333 - ns_offset, west=-64.17682 - ew_offset, 
          north=44.5541333 + ns_offset, east=-64.17682 + ew_offset, 
          top=0, bottom=0)

(abs(kadlu.era5().load_wind_uv(**kw)) == abs(kadlu.era5().load_wind_u(**kw))).all()