Debris Flow in Multnomah County, Oregon

Debris Flow December 11, 2018 – December 12, 2018 · Multnomah County, Oregon

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

What the National Weather Service wrote

Rain falling on the Eagle Creek burn scar caused a landslide that blocked exit 41 on I-84 for several days.

The wider storm

A warm front moved through northwest Oregon the morning of December 11th, lifting snow levels up high enough for precipitation to fall as rain ahead of the cold front that afternoon. Surface temperatures on Mt Hood, however, were still below freezing so rain froze on contact with surfaces and created a layer of ice. Once the cold front passed, snow levels dropped, changing precipitation back over to snow, and 10 inches of snow fell overnight December 11 to December 12. Rain falling at lower elevations also caused a landslide in the Columbia Gorge the night of December 11th.

Began near Bonneville (45.6317, -121.9545).

Source: NOAA Storm Events Database, event 798978. Narratives are written by the National Weather Service forecast office that issued the report.

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