In a rare occurrence, a rather unusual looking cloud appeared on the Nevada sky in the United States on Thursday. In an onlooker's photo, the cloud is shaped like a horseshoe magnet.
The photo went viral online after the National Weather Service in Elko, Nevada tweeted it and thanked Chrisy Grimes for taking the photo. As the name suggests, the cloud looked like a horse's shoe set upon a background of other clouds.
People all over Twitter were left shocked with the bizarre occurrence and discussed how it could be caused by some alien involvement. However, the buzz didn't last long as the NWS Elko explained the phenomenon via tweets.
One of the rarest clouds ever. This was taken over Battle Mountain, Nevada, USA on 8 March 2018.
— NWS Elko (@NWSElko) March 9, 2018
It's called a horseshoe cloud for obvious reasons. #nvwx
Credit goes to eagle-eye Christy Grimes. pic.twitter.com/XgQDY77ZzM
They explained the cloud's formation and said it goes through a process involving the movement of the wind. Essentially, the cloud's formation happens in either a vortex or an area of spinning air – something that when happening in a vertical vortex leads to the formation of a cyclone, or a tornado.
When the said vortex is horizontal, it leads to the formation of a sort of crescent cloud, according to the Cloud Appreciation Society.
How does the horseshoe cloud form... (previous tweet) as the updraft pushes flattish cumulus clouds up & a horizontal vortex develops from differential updraft speeds...
— NWS Elko (@NWSElko) March 9, 2018
Continue. (from previous tweet)...As the vortex climbs, it's caught in the faster horizontal winds aloft,& the middle part of the vortex catches the faster speeds with the ends being slower #nvwx
— NWS Elko (@NWSElko) March 9, 2018
Many urban legends about the cloud claim to bring luck to people that see it. Some people consider the cloud's downward facing position – the one that was seen in the Nevada sky – will bring luck to people down below, as per The Society.
Some Twitter users even begged to differ from the majority that claimed the cloud's shape was that of a horseshoe. These people believed it looked more like a mustache floating in the middle of the sky.
Pretty sure that’s a floating mustache https://t.co/5P4bHXc5Av
— Bekah (@ShmeckaBeks) March 10, 2018
#hangingmustache pic.twitter.com/M4My8y5YWB
— SМихайлоK (@CoeurDeCresson) March 10, 2018
— ImMikeRobertson ?? (@ImMikeRobertson) March 10, 2018
Another felt it looked more like a staple for papers than a horseshoe or a mustache.
Horseshoe?? I know a staple when I see one, son. https://t.co/tMMv4r2XxB
— what is dog?? (@semisponge) March 10, 2018
User Mika McKinnon even contributed to the on-going debate with her own two cents, using a little drawing to explain the cloud as a "weak & sideways cousin of a waterspout or tornado".
Irregular reminder that air is a fluid, thermodynamics is headache-inducing, and real science can be downright implausible. https://t.co/bajnEhcYe9
— Mika McKinnon (@mikamckinnon) March 9, 2018
Be it a stapler, or a mustache, or even a horseshoe - the cloud has definitely sparked the curiosity of many – just like the 'rainbow cloud' over Rio not so long ago.