Debris Flow — Placer, California

2023-06-09 · near Summit, Placer, California

Event narrative

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.

Wider weather episode

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.

View location on OpenStreetMap → (39.3193, -120.3128)

Source: NOAA Storm Events Database, event_id 1136187. Narrative written by the NWS forecast office that issued the report.