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Lightning strikes over the Puyehue volcano, over 500 miles south of Santiago, Chile, Monday June 6, 2011. Authorities have evacuated about 3,500 people in the nearby area. The volcano was calm on Monday, two days after raining down ash and forcing thousands to flee, although the cloud of soot it had belched out still darkened skies as far away as Argentina. (AP Photo/Francisco Negroni, AgenciaUno)

Volcano lightning

June 15, 2012

A new report revealed that volcanic lightning storms can be as powerful as giant Great Plains thunderstorms and that more lightning means a bigger plume of ash. (National Geographic)