Debris Flow in San Juan County, Colorado

Debris Flow July 17, 2021 · San Juan County, Colorado

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

What the National Weather Service wrote

A debris flow occurred as a result of heavy rain over Ophir Pass in the Southwest San Juan Mountains. Social media footage showed a combination of rock and mud across the pass with cars having to turn around as a result of the debris flow.

The wider storm

Monsoonal moisture was once again advected into southwest Colorado as the area of high pressure drifted north. This abundance of moisture combined with weak instability to fuel scattered to numerous showers and thunderstorms over the southern mountains. Some storms produced heavy rain which led to localized debris flows across portions of the Southwest San Juans.

Began near Silverton (37.8506, -107.7795).

Source: NOAA Storm Events Database, event 961526. Narratives are written by the National Weather Service forecast office that issued the report.

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