Wind data is provided by weather models at ground surface (10 m above surface). The surface altitude is estimated by the orography model included in the weather model. This orography model is quite coarse, depending of the number of vertical levels in the model.
To know which is the model altitude for Calgary, see Sounding (right click on mouse)
On Windy this feature is only available with ECMWF model, but not for GFS or NAM unfortunately. These 2 models use other altitude models.
So it is not linked to the standard barometric levels.
If this is in fact the correct behaviour, why is it that the data from both overlapping sources is in fact displayed correctly in the overlapping region in the first frame? It is only in the second frame, when the Environment Canada data in the non-overlapping regions becomes hatched, that the EC data in the overlapping region disappears.
It is this inconsistency in the behaviour of the overlapping data that was leading me to believe that this issue is bug and not the intended behaviour.
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