Dirty thunderstorm

As eruption thunderstorm lightning activity are referred to, the causes are due to the eruption of a volcano.

Friction of tephra particles ( dust- fine ash particles ) in an eruption column during volcanic eruptions there is a static charge. This charge is reduced by a lightning. Such thunderstorms very heavy rainfall can be triggered. These are caused by the water vapor in the eruption column and in the atmosphere located water-steam. This condenses on the tephra particles and grow into larger droplets approach. You will then be as in storm clouds so heavy that they fall to the ground after some time. These rains will cause dangerous mudflows, lahars the.