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volcano

It wasn't the lightning but rather the widespread ash clouds from the April 2010 eruption of Iceland's Eyjafjallajökull volcano (pictured) that eventually grounded a hundred thousand flights. Photograph by Lucas Jackson, Reuters

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)