qPositive charges in the upper portions of the cloud; Negatively
charges in lower portions; Small packet of positive charges in the
cloud base.
qlightning occurs only in clouds that extend above the freezing level è charge separation is related to ice
crystals.
qLighter crystals collide with heavy hailstones in the
cloud.
qThe lighter crystals are positively charged and move to upper portions
of the cloud.
qThe heavy hail stones are negatively charged and move to the lower
portion of the cloud.