Debris Flow in Sierra County, California

Debris Flow August 18, 2017 · Sierra County, California

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

What the National Weather Service wrote

A training thunderstorm caused flash flooding and a debris flow on the westbound side of Interstate-80 near Farad, CA, which closed the interstate from approximately 1745'1920PST. This area was associated with steep terrain and the burn scar from the Farad Fire. No damage estimates were available.

The wider storm

A weak upper low set up near southern California and slowly meandered northeast generating thunderstorms along the eastern Sierra. One thunderstorm produced large hail and another produced a very localized flash flood which lead to a debris flow.

Began near Peavine (39.4470, -120.0098).

Source: NOAA Storm Events Database, event 720636. Narratives are written by the National Weather Service forecast office that issued the report.

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