Debris Flow in Pitkin County, Colorado

Debris Flow July 20, 2021 · Pitkin County, Colorado

$50K

Damage as recorded

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

What the National Weather Service wrote

Mudslides occurred on Colorado Highway 133 at Redstone Boulevard, 9 miles north of McClure Pass near mile marker 55. The highway was closed in both directions for almost twelve hours due to cleanup operations.

The wider storm

Monsoonal moisture pushed northward across western Colorado as the ridge of high pressure tilted eastward. As a result, precipitable water values exceeded an inch over the southern and central zones. Given the increase in midlevel moisture, scattered to numerous showers and thunderstorms developed over the region. Some storms produced heavy rain which led to localized debris flows including across portions of the Grizzly Creek Fire burn scar.

Began near Redstone (39.2047, -107.2313).

Source: NOAA Storm Events Database, event 961536. Narratives are written by the National Weather Service forecast office that issued the report.

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