Thanks to my bud Ed for letting me steal this amazing picture from his desktop. This is the eruption of Chaiten Volcano in Southern Chile in early May.
"Lightning can happen as a result of a volcanic eruption. As the hot ash rises through the cooler atmosphere, transfer of charge occurs. This excess of electrons within the cloud makes it act like a capacitor, and should the conditions be correct, huge electrical discharges may be observed as bolts of lightning during volcanic eruptions."
More pix and long article here.
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