Umū dabrūtu, inscribed 𒌓𒈪 𒁕𒀊𒊒𒋾 u4-mi da-ab-ru-ti and meaning "Violent Storms" (lit. "fierce day") was an ancient Mesopotamian mythical beast, demon or species of creature and one of the eleven monsters created by Tiāmat in her conflict with the younger gods in the Epic of Creation, Enûma Eliš. Its form is unknown but was probably a composite beast like its companions.