Asperatus Clouds, "Canterbury Arch"
Lightning strikes add to the apocalyptic atmosphere.
It's a game of patience. Chasing will often involve long drives and even longer waits.
Home to some of the world's most spectacular weather, the American Midwest has long been the hunting-ground of storm chasers from around the world.
Mammatus cloud formations lend the sky an other-worldly appearance.
Awesome Cloud by Camille Seaman
Kelvin-Helmholtz Wave Clouds Over Birmingham
Mammatus clouds above Norfolk, Nebraska, 2012