I don't see much in the way of online documentation. I'd like to know if the models presented on windy are the dynamic models or are they MOS?
The weather models used by Windy are the standard deterministic models from ECMWF(IFS HRES model), NOAA (GFS FV3 model) and from other meteorological centers.
There are not MOS models which only cover USA and few additional areas.
Click on small clock on right low corner of your screen to get basic information on the models used by Windy.