how lightening apears in clouds?

Answer 1

Updraft causes the rubbing of molecules. The friction causes a charge to build up. When in discharges, that's lightening.

Answer 2

To make a real long story short.
updrafts in a storm bring water droplets so far up that it freezes and falls again because it gets heavy as it falls more water condensates to it and the draft pushes it up again and on and on until its too heavy for the draft can't push it back up. it melts as it decends or doesn't and you get hail. As these ice molecules go up and down they hit each other and give up some electrons (- charge) . the Earth and the atmosphere are slightly positive . so the positive push away from each other and the negitive moves imbetweem to make basically an electricly charged sandwich (+-+) so the - in the midle is atracted to the + below it and above it so when a stream of - meets the + on Earth it makes cloud to ground lightning. When it completes a stream to the + at the top of the cloud it makes cloud to cloud lightning

Answer 3

Lightning can occur either between a cloud and earth or between the oppositely charged portions within a cloud.In the latter case, the lightning will be visible within the cloud.
Usually the top of the cloud will be at positive potential and the base of the cloud at negative potential.Ground is supposed to be at potential potential as far as lightning is considered.

Answer 4

Since most lightning occurs inside the cloud, it shows up best at night, sometimes it can be mistaken for sheet lightning, since the cloud may be far away.