Flash Flood Warning in Coconino County

The National Weather Service has issued a flash flood warning for Coconino County, including the Grand Canyon, effective from 4:02 PM on August 23. This warning is set to expire at 7:00 PM on the same day.

The warning specifically pertains to the washes of Dragon Bravo North Canyon and South Canyon, which are currently experiencing thunderstorms leading to flash floods. The affected area also includes the Colorado River, particularly between the 21 to 32-mile markers.

As of 4:02 PM, Doppler Radar detected heavy rainfall in the Dragon Bravo North and South Canyon washes, with rainfall amounts ranging from 0.25 to 0.5 inches. Additional rain, possibly between 0.25 and 0.75 inches, may still occur in the region. The situation is serious, as a life-threatening flash flood is either happening or expected to begin shortly. The torrential rains over recently burned areas may lead to debris flows, which can carry rocks, mud, vegetation, and other loose materials.

Locations that might experience these flash floods include parts of Grand Canyon National Park and the nearby wilderness of Saddle Mountain.

Recreation areas and campsites at risk are Navaho Pinnacle, Lawn Cedar, Cave Wash Basin, Tiger Wash, Sinumo Wash, Island, Fence Breakdown, Sunpile, and Upper South Canyon Campsites.

This warning extends to several streams and rivers, including House Rock Wash, North Canyon Wash, Colorado River, South Canyon, Sinumo Wash, Sheep Spring Wash, and a few others.

Earlier on August 23, another warning was issued for a section of pipeline fire near U.S. Route 89, which was effective until 4:45 PM.

At around 2:50 PM, Doppler Radar recorded heavy rain due to a thunderstorm impacting areas near a U.S. pipeline fire scar. While no further rainfall is anticipated, conditions remain dangerous, and a potentially life-threatening flash flood is imminent in the vicinity of those fire scars.

Flash flooding has been recorded in areas like Schultz Pass, Pine Mountain Estate, Timberline, Hutchison Acres, Fernwood, Donny Park, and the Kachina Peaks Wilderness.

Flood Watch Issued

Additionally, a flood watch was established for Coconino County, valid from 3:25 PM on August 23 to 8 PM on August 25.

Flash floods are driven by excessive rainfall in various parts of northern Arizona, which notably includes the Grand Canyon Country and other local areas known for their burns.

Streams, often dry washes, swimming holes, and recently burned regions are all at risk for flash flooding. Narrow slot canyons may lead to powerful currents, and low water crossings can become inundated.

Over the next few days, numerous showers and thunderstorms are expected, potentially leading to heavy downpours.

Flood Preparedness Tips

Coconino County officials have shared some helpful tips for residents to be better prepared for storms and flooding threats:

• Consider purchasing flood insurance to protect your property.
• Create and familiarize yourself with evacuation plans.
• If flash floods occur, seek higher ground or stay where you are safe.
• Avoid walking or driving through flooded areas, as water depth and speed can be deceptive, and hazards can be hidden.
• Be cautious of debris, contaminated water, carbon monoxide, electric shocks, and dangers posed by damaged infrastructure.
• Get a professional evaluation or inspection of structures and utilities before entering flooding-affected buildings.

This article includes data from local sources and the National Weather Service. It has been updated with new information as it becomes available.