An unusual weather phenomena stunned people in Argentina over the rare cloud formation that looked like a series of giant balls of cotton wool. The overcast sky changed to Mammatus clouds last week over Casa Grande, Cordoba on November 13. The weird cloud formation, while looking beautiful, can warn of potentially violent thunder storms. Awesome Mammatus clouds, Argentina.. November 13th, 2021 ? IG: picka.bel pic.twitter.com/IBRWqYq18w — Buitengebieden (@buitengebieden_) November 18 ...