Windy does not offer observed vertical soundings but soundings forecast.
On desktop click right button of you mouse.
In the app, long press on screen.
Hi @traveria, Sounding is a plug-in that is already available. You can find more info about it here:
@traveria Hi! Thank you for suggestion! Maybe later. On one hand it sounds like a cool feature, but on the other hand we do not want to fill the application with too many functions. But if more people would demand it...