Debris Flow in Alpine County, California

Debris Flow August 26, 2025 · Alpine County, California

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

What the National Weather Service wrote

CalTrans and the California Highway Patrol reports 2 large rocks on the northbound lane of Highway 89 near Markleeville. Also, CHP reported mud, dirt, and rocks at the SR-4 and SR-89 junction south of Markleeville.

The wider storm

A high amount of atmospheric moisture in the region interacted with a short-wave trough, allowing for widespread heavy precipitation. This was day four of an extended push of monsoon moisture that produced heavy rain, localized flooding, strong outflow winds.

Began near Markleeville (38.6900, -119.7800).

Source: NOAA Storm Events Database, event 1280328. Narratives are written by the National Weather Service forecast office that issued the report.

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