Debris Flow in Malheur County, Oregon

Debris Flow July 9, 2025 · Malheur County, Oregon

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

What the National Weather Service wrote

A thunderstorm passed over the Cow Valley burn scar. Radar estimated hourly QPE ranging from 1.5 to 1.75 inches with the three hourly estimate having a peak of 2.0 to 2.5 inches. The Oregon Department of Transportation reported a debris flow across US 26 between mile markers 249-251, resulting in traffic delays. Timing was estimated using hydrophobic unit streamflow, which peaked at 6-10 cubic meters per second per kilometer squared.

The wider storm

On July 9th, an upper level low tracked northeast across eastern Oregon aiding in thunderstorm development. With a dry boundary layer, and marginal precipitable water values, outflow winds were the primary hazard with burn scar flooding a secondary hazard.

Began near Borgan (44.2610, -117.5770).

Source: NOAA Storm Events Database, event 1281124. Narratives are written by the National Weather Service forecast office that issued the report.

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