Debris Flow in Placer County, California

Debris Flow June 9, 2023 · Placer County, California

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

What the National Weather Service wrote

A rock slide was reported by CHP that occurred 7.0 mi from Truckee, CA, on Donner Pass Road between Sugar Bowl and Truckee. Road closed due to significant road damage.

The wider storm

A compact upper low shifting eastward out of region leaving a moist and unstable airmass. The anomalous higher PWATS (90-95th percentile) and CAPE favored scattered thunderstorms across the region with heavy rainfall cores capable of flash flooding, gusty and erratic outflow winds, small hail, and lightning.

Began near Summit (39.3193, -120.3128).

Source: NOAA Storm Events Database, event 1136187. Narratives are written by the National Weather Service forecast office that issued the report.

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