Is it possible to create an enclosed manmade weather system?
Real clouds are beautiful because they are huge and you observe them from far away, thereby gaining the ability to see a distinct "boundary" and, therefore, shape. But if you ever travel through a cloud in a plane, thereby seeing one close up, you'll find that they really are "just fog". You'd struggle to recreate a scale cloud in a tiny environment; water molecules have a reasonably consistent size and you can't just downscale the entire system.

Similarly, you could probably create a thunderstorm but at that scale it would be over so fast you'd barely see it. An obvious example is the movement of water droplets as steam leaves your kettle and condenses. You just see a quick whoosh of vapour particles spiralling about and, well, that's about as close to a rainstorm as you'll get.

Some phenomena, such as air vortices, can manifest at smaller scales &mdash; I've seen more than a few mini-tornados forming in my garden dragging leaves around in a funnel fashion &mdash; but I'm not sure you'd ever be able to contain enough energy to see that happen for more than a fraction of a second in a small tube.