First of all, thank you for your answers.
Effectively, I can see and predict rain, showers, thunderstorms or heavy thunderstorms with the "Rain, thunder" layer. In addition, index CAPE is very useful to predict convective rain.
Other than that, I would like to have other parameters like CIN because it's very difficult to predict thunderstorms in a place and see its evolution. It was a suggestion to improve this, I'm glad to hear from you to implement it in the future.
I love windy website and app. You're working very well.