A video showing a Supercell storm cloud originally appeared on a Twitter page for Basehunters, a group of people that track extraordinary weather.

In it, you can see a cloud moving through the air, and people near a vehicle in the background. The image was taken by a storm-chaser, according to the NY Post. It shows the large, grey cloud moving through the plains of Clareton, Wyoming on Sunday. Pressure forming from the Rockies could have led to the weather condition, according to The Washington Post.

The outstanding weather got quite a bit of attention, including Twitter coverage and You Tube videos. Although Supercells exist anywhere in the world, they are typical on the Great Plains. Supercells are sometimes called rotating thunderstorms, and they produce heavy rains. As the rainfall from Supercells is extraordinarily high, the supercells are incredibly uncommon. Supercells persist in an area called Tornado Alley, where tornadoes in the US are most frequent. Weather watchers tend to discuss Texas and Oklahoma when talking about Tornado Alley.

Basehunters Chasing is a group that is dedicated to capturing “unique and close-up” tornado footage.