Volcano Lightning, Iceland
Lightning cracks during an eruption of Iceland’s Eyjafjallajökull volcano in 2010.
The eruption’s ash clouds delayed European air travel for nearly a week.
Storms over volcanoes contain the same ingredients as storms over your hometown—water droplets, ice, and occasionally hail. The interaction of all of these elements creates an electrical charge that sparks lightning. Active craters add ash to the mix.
For an in-depth exploration of extreme weather events around the world, read National Geographic magazine's September feature "Weather Gone Wild."