A dramatic timelapse captured on August 31st shows just how quickly dangerous flash flooding can develop along the Virgin River in Zion National Park.
The footage, shared by Zion Adventures and credited to the U.S. Geological Survey, was recorded by a gauge camera overlooking the Virgin River during a storm. What begins as relatively calm conditions quickly transforms as rain arrives and floodwaters surge through the canyon.
Flooding Develops Within Minutes
Rain first becomes visible in the video at approximately 1:05pm. Just 10 minutes later the first signs of flooding begin to appear. By approximately 1:35pm, the flash flood is fully underway.
The rapid transformation demonstrates one of the biggest hazards facing visitors in Zion National Park and other canyon environments. Flash floods can develop quickly, sometimes with little warning for people already hiking or recreating in vulnerable areas. The Virgin River flows through Zion Canyon, where narrow terrain can create particularly dangerous conditions when heavy rainfall sends water rushing downstream.
Four Warning Signs of a Flash Flood
There are several warning signs that may indicate an approaching flash flood. Rapidly rising water levels can be an immediate indication that conditions are changing upstream. Visitors should also watch for a rapid increase in the speed and force of the current.
Another warning sign is a sudden change in the appearance of the water. Clear water can quickly turn brown, muddy, and churning as runoff carries sediment downstream. Large pieces of debris floating downstream can also signal dangerous flooding.
Get to High Ground
Anyone caught in the path of an incoming flash flood should immediately seek high ground and move away from the water. People should not attempt to outrun a flood through a canyon. Conditions can deteriorate rapidly, and fast-moving water can become deadly.
Visitors heading into Zion National Park should check weather conditions before beginning an adventure and remain alert for changing conditions throughout the day. The August 31st footage provides a pretty intense visual example of how quickly a peaceful river can become a dangerous flood. When in doubt, stay out.