Debris Flow in Chelan County, Washington

Debris Flow September 10, 2019 · Chelan County, Washington

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

What the National Weather Service wrote

A debris flow occurred along South Lakeshore Drive near Manson during the early morning hours of September 10th. The road was buried under 8 feet of mud, rock and debris. A nearby rain gauge recorded 1.17 inches of rain between 4:20 am and 6:20 am PDT.

The wider storm

From September 8th through September 11th a slow moving upper level low pressure with a shield of wrap around Pacific moisture passed through eastern Washington and north Idaho. Areas of moderate to locally heavy rain showers and a few thunderstorms ranged through out the region during this cool and unstable wet period. Locally heavy rain caused a few Flash Floods and numerous Debris Flows in the Cascades east slopes region and some local flooding near Pullman.

Began near Manson (47.8966, -120.2298).

Source: NOAA Storm Events Database, event 855386. Narratives are written by the National Weather Service forecast office that issued the report.

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