Flash Flood in Grand County, Utah
Flash Flood August 19, 2010 · Grand County, Utah
Where the report was made, with tornadoes recorded within 15 miles over the years.
What the National Weather Service wrote
Heavy rainfall within a short period of time resulted in flash flooding across the heavily used Mineral Bottom Road. Mineral Bottom Road was deeply washed out in the switchback section and an extensive amount of debris covered the road, which remained impassable as of mid September 2010. The road washout stranded 29 people who were airlifted by helicopter. The KGJX WSR-88D radar estimated 1.86 inches of rain within 60 minutes in the source region of the Mineral Bottom Road flash flood. The NPS' Island-In-The-Sky visitors center personnel measured 1.05 inches of rain, most of which fell within a half hour. Other locations in the area likely received flash flooding.
The wider storm
Monsoonal moisture resulted in strong thunderstorms which produced heavy rainfall, as well as hail and outflow winds that approached severe criteria.
Began near Potash (38.5124, -110.0030).
Source: NOAA Storm Events Database, event 250165. Narratives are written by the National Weather Service forecast office that issued the report.
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