Horseshoe Vortex Cloud

A horseshoe vortex cloud is an odd kind of cumulus cloud that is usually small and brief, so it goes unnoticed. It’s shaped like a horseshoe. Some sort of up and down air motion or spin in the air, known as a vortex, creates these, but exactly how they form is still a bit of a mystery. Based on their horseshoe shape, with the ends pointing downward, some people call them mustache clouds.