Debris Flow in Sanders County, Montana

Debris Flow May 21, 2023 · Sanders County, Montana

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

What the National Weather Service wrote

A thunderstorm containing very heavy rain moved directly over the Thorne Creek burn scar. Radar estimated 30 minute rainfall totals between 0.55 to 0.90 inches. A report was received from the forest service that a debris flow went over the Thompson River Road.

The wider storm

Thunderstorms developed across western Montana ahead of an approaching trough. High amounts of atmospheric moisture and slow storm motion contributed to a flash flood threat, especially over recent burn scars. A few storms produced quarter size hail.

Began near Snider (47.6556, -115.1625).

Source: NOAA Storm Events Database, event 1093781. Narratives are written by the National Weather Service forecast office that issued the report.

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