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