These incredible shots were captured by Marko Korosec, 31, a storm chaser on a recent month-long trip to the USA.
The pictures, which were taken in "Tornado Alley" as Korosec travelled through Texas, Kansas and Colorado, were shot from a distance of 1km as the giant supercells ripped up the landscape.
They shapes form when warm and cold air mix, creating a rotating column, which gives the clouds the unusual circular shape.
Suggested For You
Get top stories and blog posts emailed to me each day. Newsletters may offer personalized content or advertisements. Learn more