clouds

jnorman

perhaps an elementary question for such a bunch of wizards, but here goes -
why do clouds form into definite cohesive shapes? since the static charges of the mixed vapor molecules are all negative (to the point where they eventually will build up enormous negative density and discharge as lightning), it seems like the molecules would not clump together into clouds, but would rather disperse into as widely separated mists as possible. why doesnt the common negative charge of all the vapor molecules drive the clouds apart?