Debris Flow in Tuolumne County, California

Debris Flow September 13, 2017 · Tuolumne County, California

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

What the National Weather Service wrote

A Yosemite National Park employee reported a rock slide over Park Road near Hetch Hetchy.

The wider storm

The upper level low which had remained off the California coast for several days finally moved inland across Southern California on September 13 and produced enough instability over central California during the late afternoon for strong thunderstorms to develop over Yosemite National Park. One cell produced pea sized hail which accumulated to an inch in depth while flash flooding was reported in Hetch Hetchy. Meanwhile, an isolated thunderstorm in Bakersfield produced half an inch of rainfall in about one hour which set a new daily record.

Began near Tuolumne Meadows (37.8370, -119.7194).

Source: NOAA Storm Events Database, event 720652. Narratives are written by the National Weather Service forecast office that issued the report.

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