I heard there were powerful convective movements in clouds which were responsible for increasing the size of water droplets or ice crystals. My question is: do the same movements appear outside of clouds? Or in other words: what's so special about a cloud that makes it host these convective movements? Couldn't warm, dry air also create those movements?
If my question is not clear, don't hesitate in asking me for details.
Update: Another way to phrase the question would be: Are convective movements in clouds different than those not in clouds?