Video: https://www.dropbox.com/s/zu0j5n5lomol3we/VRP51072.mp4?dl=0
This is the spectacular moment rare mammatus clouds that are shaped like cotton balls formed in China.
Footage shows the unusual fluffy balls of clouds appearing to cover the skies during stormy weather in Hebei province on July 31.
Mammatus are sagging, pouch-like protrusions on the undersides of clouds that are usually associated with thunderstorms.
These unique clouds form when cloud droplets evaporate, saturate, and cool the air, causing parts of the cloud to sink, and creating their signature cotton ball-like appearance.