Yopaat was an important Maya storm god in the southern Maya area that included the cities of Copán and Quiriguá during the Classic period of Mesoamerican chronology. Yopaat was closely related to Chaac, the Maya rain god. Yopaat is depicted as bearing a flint weapon that represents a thunderbolt. Yopaat was held responsible for especially violent lightning storms, that were believed to cause earthquakes. He was often represented with a snake in place of one leg, demonstrating a close relationship with Kʼawiil, another Maya deity with similar attributes.