Watch as a Flash Flood In Utah occurs on a perfectly dry day in a dry river bed. This flash flood is the result of close to 3″ of rain that fell approximately 40 miles North of the location in the video. This was filmed about 6+ hours after the heavy rainfall. So if you’ve ever wondered why it’s called a Flash Flood now you know. This is also why when you go camping you never want to set up your campsite in a dry riverbed or low ground. Can you imagine getting hit by this in the middle of the night while you’re sleeping in a tent?