Flash Flood in Nevada County, California

Flash Flood October 24, 2021 · Nevada 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 ton of rocks and water come off the mountain side of old 40, (Donner Pass Rd between Truckee and Donner Summit.) the road is now closed as it is not safe to pass due to erosion and falling debris.

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 Soda Spgs (39.3300, -120.3100).

Source: NOAA Storm Events Database, event 987335. Narratives are written by the National Weather Service forecast office that issued the report.

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