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