Flood watches have been issued for nearly seven million Americans across parts of Arizona, Utah, and Colorado, as torrential rain threatens to create "raging killer currents" with little warning. The alerts are in effect through Monday evening for numerous areas, including Phoenix, the Grand Canyon, Zion National Park, Moab, Aspen, and Vail.
The dangerous conditions follow a weekend flash flood in the Grand Canyon that resulted in one hiker being found dead and at least 14 others reported missing. The National Park Service is seeking information about more than 20 individuals potentially unaccounted for in the Bright Angel Canyon and Phantom Ranch areas.
Deep monsoonal moisture, combined with repeated storms and saturated ground from earlier rainfall, is fueling the threat. Forecasters warn that runoff could transform dry washes and narrow slot canyons into dangerous, fast-moving waterways. Some storms are expected to dump more than an inch of rain per hour, with isolated totals reaching one to three inches in southern Arizona.
The National Park Service announced that the body of a 46-year-old man was recovered near Crystal Rapids along the Colorado River. The Coconino County Medical Examiner's Office is investigating.
Increased Flood Risk in Vulnerable Areas
Meteorologists noted that strong atmospheric lift across the Desert Southwest, fueled by disturbances from Mexico and California, is causing widespread thunderstorm development. Anomalous tropical moisture is contributing to the intensity of these storms. With wind shear causing storms to repeatedly track over the same areas, rainfall rates could exceed one inch per hour. Sensitive areas such as slot canyons, dry washes, and recent wildfire burn scars are particularly vulnerable to life-threatening flash floods.
Rivers, creeks, urban drainage systems, and areas with recent wildfire scars face an elevated risk of flooding. Residents and tourists are advised to monitor weather alerts and reconsider plans for activities in slot canyons and normally dry washes. Roads and low-water crossings could be overwhelmed by the rapid runoff.
In Utah, flood watches extend across national parks like Zion, Bryce Canyon, and Capitol Reef, as well as Glen Canyon and Lake Powell. Southeastern Utah, including Moab and Arches National Park, is also under alert. Colorado is experiencing similar threats, with watches covering areas from Grand Junction to Telluride and Durango.
The debris flow from Bright Angel Creek, which included sediment and debris, had previously formed a dam that raised the Colorado River's effective height by approximately eight feet.
The National Weather Service urged everyone in affected areas to remain vigilant and be prepared to act immediately if flash flood warnings are issued.
