@seligmanw
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.
https://www.weather.gov/mdl/mos_home
Click on small clock on right low corner of your screen to get basic information on the models used by Windy.