... or simply I'll consider common elevation and thickness (a scattered cloud bank).
The simplest condition is a overcast weather but it's seems a little boring
A mark on the single cloud (if elevation is different) is a good idea, better than a base with pegs (beatiful but not very functional).
A double mark: elevation and tickness could be a practical idea.
I'll propose my friends to make two wheel of fortune (one with explosion card and anoher without) and some clouds (applying the rules you described).
We'll have fun for sure!
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