Good Morning ,
I find that the big Cumulus / Thunderstorm Clouds at the Moment in the Sim looks a little bit like an Vulcanic Erruption , here you Photos von real Vulcanic Clouds .
This is as it looks like at the Moment in Sim :
But i think realistic Cumulus Clouds are much more whiter and not so sharp ended on the Edges.
This are original Cumulus / Thunderstorm Clouds :
I hope you understand what i mean .