The ash cloud hovering above Argentine Northern Patagonia since Saturday after the eruption of the Puyehue volcano in the Chilean Andes may reach the city of Buenos Aires on Tuesday, experts assured.

Chilean authorities declared on Tuesday a maximum alert and ordered the complete evacuation of two towns after the Chaiten volcano, erupting nearby, increased its activity, spewing out lava and ash.

A lightning storm can happen around a volcano when ash particles from the plume collide, creating a massive static electricity storm within the volcanic plume. Caused by a volcanic eruption rather ...