Debris Flow in Lemhi County, Idaho

Debris Flow August 1, 2021 · Lemhi County, Idaho

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

What the National Weather Service wrote

The Idaho Department of Transportation reported numerous rock and mudslides blocking US Highway 93 between Elk Bend and Ellis as a result of heavy rainfall. The roadway was closed for a period of time to allow for crews to clear roadways. Area gauge measurements suggested half an inch of rain fell across the US Highway 93 corridor over a 3 hour period.

The wider storm

Monsoonal subtropical moisture set the stage for thunderstorms to produce heavy rainfall across portions of the central Idaho.

Began near Ellis (44.6972, -113.9933).

Source: NOAA Storm Events Database, event 976610. Narratives are written by the National Weather Service forecast office that issued the report.

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