Eyjafjallajökull Volcano, Iceland
http://photography.nationalgeographic.com/photography/photo-of-the-day/eyjafjallajokull-volcano-lightning-iceland/
Lightning veins the Eyjafjallajökull volcano's ash plume,
which roiled air travel this spring.
Such "dirty thunderstorms" may occur when rock and ice particles loosed
by exploding magma collide in the atmosphere
