Dramatic video shows a rapid, muddy waterfall pouring down a Zion National Park cliffside in Utah  on Monday. A flash flood warning was issued by authorities.

Dramatic video shows a rapid, muddy waterfall pouring down a Zion National Park cliffside in Utah  on Monday. A flash flood warning was issued by authorities. [▻](https://video.twimg.com/amplify_video/2094922941272031232/vid/avc1/720x1280/JoZ9q3UE0sZTaEuf.mp4)