Dear Windy - This website is amazing! thank you so much!
A few thoughts on additional layers you could add:
Airmets/Sigmets graphical overlay
Clear Air Turbulence/Mountain wave Turbulence (eddy dissipation rate graphics)
Pireps (pilot reports)
All of this data can be pulled from AviationWeather.gov text data server:
https://aviationweather.gov/dataserver