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Debris Flow in Douglas County, Washington
Debris Flow May 19, 2020 · Douglas County, Washington
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 Washington State Patrol on Highway US-2 in Pine Canyon between Orondo and Waterville.
The wider storm
An area of low pressure slowly migrating across western United States kept a moist and unstable southerly flow of moisture into eastern Washington and Idaho on May 19th and 20th. This steered disturbances northward through Eastern Washington. Scattered thunderstorms brought localized ponding and a rock slide. Half an inch of rain fell in Waterville from slow moving cell in far western Douglas County in the late afternoon of May 19th. A few miles to the west along US-2 between Orondo and Waterville, the prolonged period of rainfall led to a rock slide. Scattered thunderstorms across southeastern Washington created a cold-air funnel cloud.
Began near Waterville (47.6502, -120.1501).
Source: NOAA Storm Events Database, event 895952. Narratives are written by the National Weather Service forecast office that issued the report.
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