M

Mare's Tail

The name given to thin, wispy cirrus clouds (Cirrus uncinus) composed of fibrous ice crystals that are blown by strong winds high in the atmosphere and point in the direction of the air movement.  They often appear as strands resembling a horse's tail or 'curly hooks'.

Mammatus

Rounded, smooth, globular ‘pouches’ clumped together and hanging underneath the base of a cumulonimbus cloud. They often form on the underside of an anvil and are accompanied by thunderstorms. The name translates to mamma and means ‘mammary cloud’.