Debris Flow in Chelan County, Washington

Debris Flow May 17, 2018 · Chelan County, Washington

$500

Damage as recorded

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

What the National Weather Service wrote

Heavy rain from thunderstorms during the evening of May 17th resulted in a debris flow of rocks and mud onto the Malaga-Alcoa Highway betrween mileposts 10 and 12.

The wider storm

Thunderstorms developed over the east slopes of the Cascades and the Columbia Basin in a rich feed of wrap around moisture from an upper low over Oregon during the night of May 17th. These storms dumped a general quarter to half inch of rain over most of the western basin, but individual cells locally produced higher amounts with Ephrata measuring 0.72 inches. Local flash flooding and debris flows were noted from these storms.

Began near Malaga (47.3400, -120.1200).

Source: NOAA Storm Events Database, event 758689. Narratives are written by the National Weather Service forecast office that issued the report.

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