a bit of everything

[jankees]

[a1]

3rd one looks very realistic.

[Astir77]

really nice especially the first one!! - How do you get that much vertical difference in the Clouds?

[Daube]

For getting cumulus vertical like this, you should set the manual weather, and create a large (high) layer of strom clouds. May work with cumulus too. You get them as well with the ramdom weather modifications too. I set mine to medium, and when flying at least half an hour, I usually get comparable clouds formations

[jankees]

actually, it is a 'major thunderstorm' using FS Sky world.
I can fully recommend their clouds.