Debris Flow in Sierra County, California

Debris Flow October 24, 2021 · Sierra 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 boulder in the middle of the westbound lane of US Highway 89.

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 Sierraville Drwtr Ar (39.5500, -120.3200).

Source: NOAA Storm Events Database, event 987333. Narratives are written by the National Weather Service forecast office that issued the report.

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