Debris Flow in Plumas County, California

Debris Flow October 24, 2021 · Plumas County, California

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

What the National Weather Service wrote

California Highway Patrol reported a large (larger than a basketball) boulder in the road on State Highway 70 near Camp Layman Road.

The wider storm

A strong atmospheric river event produced a major heavy rain, high wind, and high elevation snow event for much of the region. Record-setting rainfall amounts for many areas of the Sierra into western Nevada. NWS Reno received multiple reports of mud and rock slides in the Sierra along I-80 near the summit, and CA 70 and CA 89 in Sierra, Plumas, and Lassen Counties.

Began near Two Rivers (39.8405, -120.6782).

Source: NOAA Storm Events Database, event 987330. Narratives are written by the National Weather Service forecast office that issued the report.

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