Horseshoe cloud

A horseshoe cloud is a relatively uncommon meteorological phenomenon[1] which manifests as a cloud in the shape of a horseshoe or inverted letter "U".[1][2]

A horseshoe cloud in 2016

They occur when a horseshoe vortex deforms a cumulus cloud.[2] The clouds are relatively short-lived.[2] Horseshoe vortex clouds are a form of "fair-weather" funnel cloud and are similar to the shear funnel type of funnel cloud.

A March 2018 instance was explained by the United States' National Weather Service:[3][4]

As the updraft pushes flattish cumulus clouds up & a horizontal vortex develops from differential updraft speeds... 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.

References

"Horseshoe Vortex Cloud (February 07)". Cloud Appreciation Society. Retrieved 12 March 2018.
"An incredibly rare 'horseshoe cloud' was spotted in Nevada and it kept the meme-makers busy". Independent.ie. 12 March 2018. Retrieved 12 March 2018.
@NWSElko (2018-03-12). "As the updraft pushes flattish cumulus clouds up & a horizontal vortex develops from differential updraft speeds..." (Tweet) – via Twitter. |date= mismatches calculated date from |number= by two or more days (help)
@NWSElko (2018-03-12). "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" (Tweet) – via Twitter. |date= mismatches calculated date from |number= by two or more days (help)

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[CAS-1] "Horseshoe Vortex Cloud (February 07)". Cloud Appreciation Society. Retrieved 12 March 2018.

[IIE-2] "An incredibly rare 'horseshoe cloud' was spotted in Nevada and it kept the meme-makers busy". Independent.ie. 12 March 2018. Retrieved 12 March 2018.

[3] @NWSElko (2018-03-12). "As the updraft pushes flattish cumulus clouds up & a horizontal vortex develops from differential updraft speeds..." (Tweet) – via Twitter. |date= mismatches calculated date from |number= by two or more days (help)

[4] @NWSElko (2018-03-12). "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" (Tweet) – via Twitter. |date= mismatches calculated date from |number= by two or more days (help)