Snow Rollers

Snow rollers are the opposite of fire tornadoes, but they're just as awesome!

Snow rollers are essentially snow tumbleweeds. They start as chunks of snow blown along the ground. They pick up more and more snow and they're blown until they are too heavy for the wind to push it anymore. They tend to be cylindrical because the core is often weaker and thinner than the outer layers, so any snow inside ends up blowing away.