John - I understand that reasonably well. But trust me, the forecasts are wrong. Just plain wrong. I work every day in the mountains where Windy says it will be raining, it is absolutely not raining, not even close. Perhaps the EC model is trying to be "too clever". But they are chronically wrong either way.
Tomber - Windy may not be responsible in a technical sense, but they publish a website with errors in the forecasts. So in branding and public perception, it is Windy who is wrong, not the model that windy is porting.
I like Windy, but I hit so many accuracy hurdles over the years. It is hard to commit to them. Speaking mainly in terms of Windy as a mountain snow forecasting tool.