According to the National Park Service, a woman aged 29 was killed and several others were hurt in a flash flood that occurred in Grand Canyon National Park.

Two people were reported missing by authorities on Thursday. Other victims were also injured in the flood of the Colorado River. Officials at Grand Canyon didn’t see the missing persons until Friday morning.

Rebecca Copeland (29), Ann Arbor Michigan, was declared dead when help arrived. Unnamed, the other person was not injured.

Flash floods are very common in the desert southwest because the environment is not able to absorb rainwater. Because of this, rain can move quickly through narrow canyons.

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“In many places, even small storms can transform normally dry streambeds into raging rivers of water in a matter minutes. Flash flooding is possible whenever rainfall is predicted.