@yves70 Many thanks for this. It puts a new light on everything.
Best posts made by willeda1
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wind provenance - where does it come from
A simple question but, currently affected by a cold spell from the east (UK news, 2021-02-03, the Beast from the East II) potentially non-trivial, is it possible to show where our current air mass came from?
You could just use Windy to follow the current wind flows backwards but that would not be correct because to back trace the path of a current air packet you need to integrate against increasing distant past and not current flows. I'm trying to work out in my head what a solution to this problem would look like but I suspect it may be a well studied problem. Also air move between different altitudes? Unfortunately, I don't know anything about fluid dynamics. The question is real however: as some one asked "does this snow come from the North or from Russian?"