A flash flood warning was issued for the Cottonwood burn scar in Beaver County on July 21. The National Weather Service in Salt Lake City reported that thunderstorms were producing heavy rain over the area, creating life-threatening flash flooding hazards.
The warning, which was effective until 11:45 PM MDT, specifically targeted east central Beaver County in southern Utah.
At 7:51 PM MDT, Doppler radar indicated thunderstorms producing heavy rain over the Cottonwood burn scar. Depending on the drainage, between 0.25 and 1.25 inches of rain had fallen.
While the bulk of the heaviest rain fell over Mt Holly, heavy rain also impacted Merchant Valley in Beaver Canyon and middle portions of the South Fork of North Creek. The National Weather Service stated that flash flooding was ongoing or expected to begin shortly.
Excessive rainfall over the burn scar was expected to result in debris flows moving through the South Fork of North Creek and the Beaver River. These debris flows can consist of mud, rock, vegetation, and other loose materials.
The primary hazard identified was life-threatening flash flooding in and around the Cottonwood burn scar, specifically affecting North Creek and the Grove area.
This alert has since expired.
