Torrential/təˈrenʃl/ Definition 1 of 2Pro Tip 1/3Severe Weather Used to describe especially severe weather conditions, implying potential damage. The torrential storm caused the evacuation of coastal areas. Pro Tip 2/3Unexpected Onset Often describes sudden and unexpected heavy rain that starts quickly. We were caught in a torrential downpour during our hike. Pro Tip 3/3Short Duration Can indicate a short but intense period of rainfall. The picnic was ruined by a brief torrential shower.