Debris Flow in Pitkin County, Colorado

Debris Flow July 22, 2021 · Pitkin County, Colorado

$300K

Damage as recorded

Where the report was made, with tornadoes recorded within 15 miles over the years.

What the National Weather Service wrote

Heavy rains resulted in a debris flow of mud, branches and rocks across Avalanche Creek Road. The road remained closed and impassable overnight before reopening the next morning.

The wider storm

Even with high pressure centered over the region, deep monsoonal moisture continued to advect into western Colorado. In addition to the well above normal precipitable water values across the area, the passage of a subtle shortwave trough resulted in the development of widespread showers and thunderstorms. Some storms produced heavy rain which led to debris flows including across portions of the Grizzly Creek Fire burn scar.

Began near Redstone (39.2480, -107.2170).

Source: NOAA Storm Events Database, event 965332. Narratives are written by the National Weather Service forecast office that issued the report.

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