13K views · 347 reactions | Tornadoes occur on nearly every continent on Earth. Tornadoes form during thunderstorms, when warm moist air collides with cool dry air but will only form when the atmospheric conditions are just right. One of the great mysteries of science is why one storm will produce tornadoes and another won't. Watch Mutant Weather on Sundays at 7pm on National Geographic UK. | National Geographic UK | Facebook

On this very night 4 years ago, 12-10-2021, I chased one of the longest tracked tornadoes in US history. Dubbed the Quad State tornado, my chase started near Jonesboro, AR where I first encountered this fast moving storm (roughly 50 mph). As the parent supercell approached my location southwest of Jonesboro, it became tornado warned, The base of the storm passed over the top of me, but was not yet producing a tornado, but did touch down just a 1/4 mile to my east shortly after. I then raced thro