The grand prize winner of National Geographic's 2015 Photo Contest shows a rare and awesome force of nature.
Photographer Jame Smart's "Dirt" captures an anti-cyclonic tornado as it touches down on farmland near Simala, Colo.
Anti-cyclonic tornadoes are rarer and generally less powerful than cyclone tornadoes.
"Dirt" also won the contests Nature category. To see the other submissions, check out National Geographic's finalists page.