Mammatus clouds were spotted in the skies above Du Hubei, China. Videos shared on social media went viral due to the curious shape of the meteorological phenomenon.

They might look soft and fluffy, but some people were concerned because this type of cloud usually signifies that a storm is approaching.

Mammatus

Mammatus is a meteorological term applied to the pattern of "pouches" that form at the base of a cloud. The term "mammatus" derives from the word mamma, due to its association with the shape of breasts.