Debris Flow in Plumas County, California

Debris Flow June 12, 2023 – June 13, 2023 · Plumas County, California

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

What the National Weather Service wrote

The California Highway Patrol reported multiple slides mud/dirt/rock on SR 70 east of Twain, completely blocking the roadway.

The wider storm

Low pressure over Southern California brought significant amounts of atmospheric moisture northward over the mountains, producing showers and thunderstorms with locally heavy rain and multiple reports of small hail. Heavy rain from thunderstorms over western Plumas County produced more than a dozen small debris flows along State Route 70, blocking the highway. There was also a rock slide with a large boulder at Donner Pass.

Began near Halstead Flat (40.0193, -121.0650).

Source: NOAA Storm Events Database, event 1106214. Narratives are written by the National Weather Service forecast office that issued the report.

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