You already asked this on the prior question but I will go more in depth here.
Alright so clouds are condensed masses of water vapor that float around the different levels of the atmosphere. The warmer the air, the higher the clouds tend to be. However lets say in the case of a tornado you have the hot air coming in from the south and then the cold air hitting the warm air and as it collides it forms rotation causing it to spin downward at incredible speeds. However there are multiple other factors for producing storms like that.
Another thing that I would add to it is that clouds come in all different shapes and sizes.
-Cirrus
-Cirrostratus
-Cirrocumulus
-Altocumulus
-Altostratus
-Nimbostratus
-Cumulus
-Stratus
-Cumulonimbus
-Stratocumulus