May I have a question?
If ForeFlight app brings you every information you need, why do you want the same on Windy? Does Windy has something better?
Then according to their presentation, they say to have a world wide layer of pressure showing isobars and pressure centers... Windy has the same. They show surface analysis with fronts, troughs... but only over USA.
You talk about upper level waves but Windy shows them too with Geopotential heights, Wind, Temperature, Humidity... at these levels.